Data Replication Manager
HSG80 ACS Version 8.5P
Operations Guide
EK-DRVMS-TE. A01
Fourth Edition (January 2001)
Compaq Computer Corporation
2001 Compaq Computer Corporation.
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Printed in the U.S.A.
Data Replication Manager HSG80 ACS V8.5P Operations Guide
Fourth Edition January 2001
Part Number EK-DRVMS-TE. A01
Contents iii
Contents
About This Guide
Getting Help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Compaq Website . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Compaq Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Electrostatic Discharge Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Component Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Special Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Text Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Data Replication Manager Solution Kits for Windows NT/Intel and OpenVMS . . . . . . . . . . . . xviii
Chapter 1
Introduction to Data Replication Manager
Data Replication Manager Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Peer-to-Peer Remote Copy Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hardware Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hardware Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ESA12000 Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Fibre Channel Gigabit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Gigabit Interface Converters (GBIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power Distribution Unit (PDU). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Fully-Redundant Power--Optional. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Host Bus Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
iv Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Software Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Array Controller Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Secure Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
StorageWorks Command Console (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Required Hardware and Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Chapter 2
Data Replication Manager Concepts
Remote Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Remote Copy Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Synchronous Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Asynchronous Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Operation Mode Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Outstan ding_IO Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Synchronous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Outstanding Write Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
High Outstanding I/O Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Low Outstanding I/O Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Suspend/Resume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Error Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Association Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Association Set characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
FAIL_ALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Write History Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Mini-merge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fast-Failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Log Unit Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Log Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
ORDER_ALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Planned Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Unplanned Failover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Chapter 3
Getting Started
Site, Host, and Solution Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Host Bus Adapter Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Setting Up the Fibre Channel Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Contents v
Setting Up the Fiber Optic Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Host-to-Switch Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Switch-to-Controller Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Chapter 4
Configuring a Data Replication Manager Solution
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Configuring Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Configuration Procedures Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
TARGET SITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
INITIATOR SITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Configure the Controllers at the Target Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Example Display 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Example Display 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Example Display 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Example Display 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410
Example Display 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Example Display 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
Example Display 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
Example Display 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Example Display 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414
Configure Storage at the Target Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Devices and StorageSets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Example Display 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416
Connect Fiber Optic Cables Between the Controllers and Fiber Channel Switches . . . . . 417
Connect the Target Site to the External Fiber Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Long Wave GBICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Other Transport Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Configure the Host from the Target Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
Install Secure Path (NT only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420
Install SWCC (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420
Connect Fiber Optic Cables Between the Hosts and the Switches . . . . . . . . . . . . . . . . . . 420
Fiber Optic Cable Connection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
Example DIsplay 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Example Display 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
Rename the Host Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
Example Display 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Configure the Controllers at the Initiator Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
Controller Pre-Configuration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
Controller Configuration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
vi Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Example Display 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
Example Display 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
Example Display 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428
Example Display 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429
Example Display 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
Example Display 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431
Example Display 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431
Example Display 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432
Example Display 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Configure the Storage at the Initiator Site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Devices and StorageSets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Example Display 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Cabling the Initiator Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435
Connect Fiber Optic Cables Between the Controllers and Switches . . . . . . . . . . . . . . . . . . 435
Connect the Initiator Site to the External Fiber Link. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
Long Wave GBICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
Other Transport Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
Create Remote Copy Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
Initiator Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
Create Connections From the Target Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
Create RCS from the Initiator Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
Example Display 24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
Set Failsafe at the Initiator Site (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440
Creating Log Units and Association Sets (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Creating a Log Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Example Display 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Example Display 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442
Creating Association Sets and Assigning a Log Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442
Example Display 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
Configure the Host from the Initiator Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444
Install the Host Bus Adapters and Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444
Example Display 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444
Install Secure Path (NT only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445
Install SWCC (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445
Connecting Fibre Optic Cables Between the Hosts and the Switches . . . . . . . . . . . . . . . . . 445
Example Display 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 447
Rename the Host Connections from the Initiator Site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448
Example Display 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
Enable Access to the Hosts at the Initiator Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450
Install Cluster Server for Windows NT (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
Documenting Your Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
Contents vii
Terminal Emulator Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
SHOW Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
Example Display 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452
Example Display 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453
Example Display 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
Example Display 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
Example Display 353 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
Chapter 5
Managing Site Failover and Failback Procedures
Power Up the Data Replication Manager Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Target Site Powerup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Initiator Site Powerup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Power Down Data Replication Manager Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Initiator Site Power Down Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Target Site Power Down Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Site Failover Basic Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Site Failback Basic Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Data Replication Manager Configuration Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Planning Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Planned Failover Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Initiator Site Preparation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Target Site Failover Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
Target Host Setup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511
Simple Failback Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512
Initiator Site Failback Preparation Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
Target Site Failback Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
Initiator Site Clean Up Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515
Unplanned Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516
Target Site Failover Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516
Full Failback Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518
Initiator Site Preparation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518
Target Site Failback Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520
Initiator Site Clean-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521
Failing Back New Remote Copy Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523
Target Site: Add Remote Copy Set Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523
Initiator Site: Failover Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524
Target Site: Restart Controllers Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524
New Hardware Failback Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525
Initiator Site Preparation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525
Target Site Preparation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 527
viii Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Initiator Site Connections Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528
Target Site Copy Data Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528
Initiator Site Return Control Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529
Target Site Clean-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530
Initiator Site Restoration of Target Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530
Initiator Site Clean-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530
Chapter 6
Troubleshooting
HSG80 Array Controller Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Forced Errors Detected During Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Read Errors Detected During Full Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Dual Redundancy During Failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Failsafe Lock Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Link Failure Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Remote Copy Set Member Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Remote Copy Set Worldwide LUN ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Write History Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Failure Notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
HSG80 Array Controller Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
SWCC Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Failure of One Member in a Dual Redundant Controller Pair . . . . . . . . . . . . . . . . . . . . . . . . 66
Failure of Both Fiber Optic Cables or Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Failure Modes of a DT System in Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Failure at Target Site after Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Appendix A
Status Comparison
Target Site Terminal Emulator Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
SHOW Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2
Example Display 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3
Example Display 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4
Example Display 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4
Example Display 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5
Example Display 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5
Glossary
Index
Figures ix
Figures
Figure 11. ESA12000 Storage building block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12. Additional components for Data Replication Manager. . . . . . . . . . . . . . . . . . . . . . 15
Figure 13. Fibre channel gigabit switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 14. Fibre channel-based DT storage subsystem (with fully-redundant power) . . . . . . 18
Figure 21. Remote copy set operation modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 22. Association sets reside on the initiator controller pair . . . . . . . . . . . . . . . . . . . . . . 27
Figure 31. Component locations and names. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 41. Data Replication Manager basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 42. Switch Port Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
Figure 43. Cabling between the controllers and switches . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Figure 44. Cabling from the target site to the initiator site. . . . . . . . . . . . . . . . . . . . . . . . . . . 419
Figure 45. Cabling between the host and the switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Figure 46. Host renaming worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Figure 47. Port Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435
Figure 48. Cabling between the controllers and switches . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
Figure 49. Cabling from the initiator site to the target site. . . . . . . . . . . . . . . . . . . . . . . . . . . 437
Figure 410. Cabling between the hosts and the switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446
Figure 411. Data Replication Manager cabling at initiator and target sites . . . . . . . . . . . . . . 446
Figure 412. Host renaming worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448
Figure 51. Data Replication Manager basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
x Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Tables
Table 11 Hardware Requirements Checklist and Part Numbers . . . . . . . . . . . . . . . . . . . . . . . 110
Table 12 Software Requirements Checklist and Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . 111
Table 21 Data Replication Manager Switch Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Table 41 Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 51 Failover Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 52 DRM Planning Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 61 Failure Modes of a DT System with Normal Operation . . . . . . . . . . . . . . . . . . . . . . . 67
Table 62 Target Site DT Failure Modes After Failover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
About This Guide
This guide describes the Data Replication Manager and how to use it during a
failover/failback situation running on the HSG80 Array Controller.
See the documentation that accompanied the subsystem for detailed information about
subsystem enclosures and their components.
Getting Help
If you have a problem and cannot find the information you need to resolve it in this guide,
you can get further information and other help in the following locations:
Compaq Website
The Compaq Website has information on this product as well as the latest drivers and
Flash ROM images. You can access the Compaq website by logging on to the Internet at:
http://www.compaq.com/products/storageworks
Compaq Technical Support
Use the following to connect with Compaq technical support:
s United States and Canada, call 1-800-652-6672
s Outside the United States and Canada, visit the Compaq website at
http://www.compaq.com/products/storageworks/
xii Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Precautions
Follow the precautions listed in the sections "Electrostatic Discharge Precautions" and
"Component Precautions" when carrying out the procedures outlined in this guide.
Electrostatic Discharge Precautions
Static electricity collects on all nonconducting material, such as paper, cloth, and plastic.
An electrostatic discharge (ESD) can easily damage a controller or other subsystem
component even though you may not see or feel the discharge. Follow these precautions
whenever you're servicing a subsystem or one of its components:
s Always use an ESD wrist strap when servicing the controller or other components in
the subsystem. Make sure that the strap contacts bare skin, fits snugly, and that its
grounding lead is attached to a bus that is a verified earth ground.
s Before touching any circuit board or component, always touch a verifiable earth
ground to discharge any static electricity that may be present in your clothing.
s Always keep circuit boards and components away from nonconducting material.
s Always keep clothing away from circuit boards and components.
s Always use antistatic bags and grounding mats for storing circuit boards or
components during replacement procedures.
s Always keep the ESD cover over the program card when the card is in the controller. If
you remove the card, put it in its original carrying case. Never touch the contacts or
twist or bend the card while you're handling it.
s Never touch the connector pins of a cable when it is attached to a component or host.
Component Precautions
System components referenced in this guide comply to regulatory standards and the use of
other components in their place may violate country standards, negate regulatory
compliance, or invalidate the warranty on your product.
About This Guide xiii
Conventions
This book uses the special notices and typographical conventions described in the
following sections to help you find what you are looking for.
Special Notices
This book does not contain detailed descriptions of standard safety procedures; however, it
does contain warnings for procedures that could cause personal injury, and cautions for
procedures that could damage the controller or its related components. Look for these
symbols when you are carrying out the procedures in this book:
WARNING: A Warning contains information essential to people's safety. It advises
users that failure to take or avoid a specific action could result in physical harm to the
user or hardware. Use a warning, not a caution, when such damage is possible.
CAUTION: A Caution contains information that the user needs to know to avoid
damaging the software or hardware.
IMPORTANT: An Important note is a type of note that provides information essential to the
completion of a task. Users can disregard information in a note and still complete a task, but
they should not disregard an important note.
NOTE: A note indicates neutral or positive information that emphasizes or supplements
important points of the main text. A note supplies information that may apply only in special
cases--for example, memory limitations, equipment configurations, or details that apply to
specific versions of a program.
xiv Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Text Conventions
Convention Meaning
ALLCAPS Command syntax that must be entered exactly as shown, for example:
SET FAILOVER COPY=OTHER
Command syntax that is discussed within text, for example:
ALLCAPS
"Use the SHOW SPARESET command to show the contents of the
spareset."
MONOSPACED SCREEN DISPLAYS ARE IN UPPER-CASED MONOSPACED FONT.
Sans serif italic Command variable or numeric value that you supply, for example:
Sans serif italic SHOW RAIDset-name
or
SET THIS_CONTROLLER PORT_1_SCS_NODENAME=xxxxxx
References to other books, for example:
Serif italic
"See the Compaq StorageWorks HSJ80 Array Controller Configuration
Guide for details."
. Indicates that a portion of an example or figure has been omitted.
The controller serving your current CLI session through a local or remote terminal.
"this controller"
The controller in a dual-redundant pair that's connected to the controller serving
"other controller"
your current CLI session.
About This Guide xv
Related Publications
The following table lists some of the documents that you will need to refer to when
connecting, configuring, and operating your DRM solution.
Document Title Part Number
HSG80 Array Controller ACS V8.5 Configuration Guide 165144-001 / EK-HSG85-CG
HSG80 Array Controller ACS V8.5 CLI Reference Guide 165145-001 / EK-HSG85-RG
HSG80 Array Controller ACS V8.4/8.5 118629-002 / EK-HSG84-SV
Maintenance and Service Guide
StorageWorks Fibre Channel Storage Switch Service Guide 135268-001 / AA-RHBZA-TE
StorageWorks Fibre Channel Storage Switch User's Guide 135267-001 / AA-RHBYA-TE
Compaq StorageWorks RA8000 and ESA12000 387404-001 / EKSMCPRUG
Storage Subsystems User's Guide
Compaq Storageworks RA8000 and ESA12000 Fibre Channel 101471-003 / EK-NTC8K-IG
Cluster Solutions for Windows NT Installation Guide
RA8000 and ESA12000 HSG80 Solution Software V8.4/V8.5 387387-003 / AA-RFA9B-TE
for WindowsNT Server - Intel Installation Reference Guide
RA8000 and ESA12000 HSG80 Solution Software V8.4/V8.5 387401-002 / AARH4BB-TE
for Open VMS - Installation Reference Guide
StorageWorks Secure Path for Windows NT, A High 123995-002 / EK-WNTMP-MH
Availability MultiPath Solution Installation Guide
KGPSA PCI-to-Fibre Channel Host Adapter EKKGPSAUG
Compaq StorageWorks Ultra SCSI RAID Enclosure 387403001 / EKBA370UG
(DS-BA370-Series) User's Guide
Command Console Version 2.2(HSG80) for 387405-003 / AA-RFA2D-TE
RA8000/ESA12000 User's Guide
xvi Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Data Replication Manager Solution Kits for
Windows NT/Intel and OpenVMS
The part number required to order a Data Replication Manager (DRM) Solution kit
depends upon which operating system the DRM will operate on:
s Windows NT Solution Kit Part Number = QB-6BTAE
s OpenVMS Solution Kit Part Number = QB-6BTAC
The following components should be included in the DRM Solution Kit:
s Compaq StorageWorks Data Replication Manager HSG80 Array Controller ACS
Version 8.5P Operations Guide
s Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 Configuration
Guide
s Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 CLI Reference
Guide
s Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 Maintenance and
Service Guide
s Comm and Console V2.2 (HSG80) for RAID Array 8000/ESA 12000 User's Guide
s RA8000/ESA12000 HSG80 Solution Software V8.5 for Windows NT - Intel Installation
Reference Guide
s RA8000/ESA12000 HSG80 Solution Software V8.5 for OpenVMS Installation
Reference Guide
s RAID Array 8000/ESA12000 Fibre Channel Cluster Solutions for WindowsNT
Installation Guide
s RAID Array 8000/ESA12000 Fibre Channel Cluster Solutions for OpenVMS
Installation Guide
s Compaq StorageWorks Warranty Terms and Conditions
s Compaq StorageWorks Customer Letter
s Compaq License Agreement
s HSG80 Product Registration Card
About This Guide xvii
Revision History
Revision Level Date
Revision D January 2001
EK-DRVMS-TE. A01
Revision C December 1999
EK-HSG84-DT.C01/128519-003
Revision B October 1999
EK-HSG84-DT.B01/128519-002
Revision A April 1999
EK-HSG84-DT.A01/128519-001
1
Chapter
Introduction to Data Replication Manager
This chapter introduces Data Replication Manager and describes the required hardware
and software components.
This chapter contains the following topics:
s "Data Replication Manager Overview" on page 11
"Peer-to-Peer Remote Copy Function" on page 12
"Hardware Redundancy" on page 12
"Hardware Components" on page 12
"Final Assembly" on page 18
"Software Components" on page 19
s "Required Hardware and Software" on page 110
Data Replication Manager Overview
Data Replication Manager (DRM) provides a disaster-tolerant solution through the use of
hardware redundancy and data replication across multiple sites separated by some
distance.
A Data Replication Manager configuration consists of multiple sites. The initiator site is
where primary data processing occurs. The target site is used for data replication. Since
data processing occurs at the initiator site, the data is replicated or mirrored to the target
site. If a significant failure happens to the initiator site, then data processing can be
resumed at the target site where the data is intact.
12 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
The DRM sites are connected over some distance via fiber optic cable or ATM. Data
Replication Manager uses Fibre Channel gigabit switches to send the data between the
sites. Other hardware may be inserted between the fibre channel switches if longer
distances exist between sites.
Peer-to-Peer Remote Copy Function
Data Replication Manager uses the peer-to-peer remote copy function of the HSG80
controller to achieve data replication. HSG80 controller pairs at the initiator site are
connected to their partner HSG80 controller pairs at the target site. Remote copy sets are
created from units at the initiator and target sites. These remote copy sets are mirrors of
each other. As data is written to a unit at the initiator, it is mirrored to its remote copy set
partner unit at the target site.
The HSG80 controllers provide failover and failback capabilities in case of failures.
Failover makes the data available at the target site after a failure. Failback is used to move
data operations back to the initiator once it has been brought back on-line.
Hardware Redundancy
Data Replication Manager provides hardware redundancy. In the face of single component
failures at a site, Data Replication Manager will failover to a redundant component at that
site to allow continued operations. For example, if one of the dual-redundant Fibre
Channel links between the sites were to fail, Data Replication Manager would switch to
the other link.
Hardware Components
Data Replication Manager uses a minimum of two HSG80 array controller pairs: one at
the initiator site and one at the target site. Each site houses one or more ESA12000
cabinets that are equipped with one or more BA370 enclosures and disk Storage Building
Blocks (SBBs). Each BA370 enclosure holds 24 disks.
NOTE: Data Replication Manager can run with cabinets that have 24, 48, or 72 (requires two
cabinets) disk drives, but the initiator and target sites must be equipped with the identical
number of disks.
The hosts at the initiator and target sites are connected to a pair of dual redundant HSG80
array controllers, which are located inside of these enclosures. See the RA8000 and
ESA12000 Storage Subsystems User's Guide for complete details on this equipment.
Introduction to Data Replication Manager 1 3
NOTE: While this documentation addresses ESA12000 storage cabinets as the primary unit for
Data Replication Manager configurations, Compaq's DT solution will function in any equivalent
cabinet that houses a BA370 enclosure.
Connections between the controllers and hosts are made at each site with two Fibre
Channel gigabit switches and two host bus adapters. Short-wave Gigabit Interface
Converters (GBICs) connect the host and controllers to the switches at each site. Extended
GBICs or ATM connect the initiator and target switches together if they are more than 500
meters apart.
ESA12000 Cabinet
The ESA12000 Storage Building Block Cabinet houses the BA370 Enclosures, which
contain the following components:
s Two HSG80 Fibre Channel RAID Array Controllers
s One Environmental Monitoring Unit (EMU)
s One or Two AC Input Power controllers
s Up to 24 Disk Drive Storage Building Blocks (SBB) per BA370 Enclosure
s Five to Eight 180-watt Power Supplies
s External Cache Battery (ECB), dual
s Eight Cooling Fans
s Six single-ended I/O Modules
s One Power Verification and Addressing module (PVA)
s Two cache modules (512 MB required)
For detailed information about these components, refer to the HSG80 Array Controller
ACS Version 8.5 Configuration Guide and HSG80 Array Controller ACS Version 8.5 CLI
Reference Guide and the HSG80 Array Controller ACS Version 8.5 Maintenance and
Service Guide.
14 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Figure 11 shows these parts inside the ESA12000 cabinet with a 24 disk drive capacity.
Subsequent sections outline additional hardware requirements needed to complete the
Data Replication Manager solution.
CXO6843A
Figure 11. ESA12000 storage building block
Introduction to Data Replication Manager 1 5
Figure 12 highlights the specific components that must be added to the ESA 12000
building block to support a Data Replication Manager solution.
1. Top Fibre Channel
Gigabit Switch, 8- or
16-port
2. Bottom Fibre
Channel Gigabit
Switch, 8- or 16-
port
3. Redundant Power
Distribution Unit
(optional)
1
2
3
CXO6844A
Figure 12. Additional components for Data Replication Manager
The following sections outline the components that are specific to the disaster tolerant
solution.
16 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Fibre Channel Gigabit Switch
The Fibre Channel gigabit switch, shown in Figure 13, is used to connect the controllers
to the hosts and to link the initiator and target sites together. The ports hold short- or
long-wave Gigabit Interface Converters, which are described in the next section. See the
StorageWorks Fibre Channel Storage Switch User's Guide for an in-depth look at the
features and functions of the Fibre Channel gigabit switch.
CXO7085A
Figure 13. Fibre channel gigabit switch
Gigabit Interface Converters (GBIC)
GBICs are the converters that are inserted into the ports of the Fibre Channel switch and
serve as the interface between the fiber optic cables and the switch. Short-wave GBICs are
used with a 50 micron multi-mode fiber optic cable (SC-terminated) to connect the
components at the initiator and target sites (host-to-switch; controller-to-switch). The
maximum distance that short-wave GBICs support is 500 meters. Long-wave GBICs are
used with 9 micron single-mode fiber optic cables (SC-terminated) to link the initiator and
target sites together. Long-wave GBICs connect switches that are up to 10 kilometers
apart. See the StorageWorks Fibre Channel Storage Switch User's Guide to learn more
about GBICs.
Power Distribution Unit (PDU)
The PDU is another component that is included with the ESA12000 cabinet and is used to
distribute power to the BA370s and switches. A second PDU can be ordered to support a
fully-redundant power configuration. See the RA8000 and ESA12000 Storage Subsystems
User's Guide for more detailed information.
Introduction to Data Replication Manager 1 7
Fully-Redundant Power--Optional
Fully-redundant power is an optional feature designed to offer a more secure source of
power in the event that one or more units should fail. If less than five power components
are operational, then the entire cabinet will shut down. This requires three additional
power supplies and one additional AC power controller that plugs into one additional
PDU. These additional components must be supplied for each BA370 enclosure. See the
RA8000 and ESA12000 Storage Subsystems User's Guide for more details about power
supply Storage Building Blocks (SSBs).
Host Bus Adapter
The host bus adapters are inserted into the available slots on the host computer's PCI Bus.
A Fibre Channel connection is made by inserting a multi-mode fiber optic cable between
each adapter and an individual port on the Fibre Channel switch. See the KGPSA
PCI-to-Fibre Channel Host Adapter guide for more information.
18 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Final Assembly
Your final DT setup should reflect Figure 14.
CXO6842A
Figure 14. Fibre channel-based DT storage subsystem (with fully-redundant power)
NOTE: If you prefer to join cabinets for more storage capacity, follow the instructions in the
RA8000 and ESA12000 Storage Subsystems User's Guide, and be sure to establish the same
setup at both the initiator and target sites. Keep in mind that an additional cabinet will not
include switches or controllers. It will, however, hold a PDU and be able to support redundant
power.
Introduction to Data Replication Manager 1 9
Software Components
This section describes the software components necessary to configure and manage a DT
storage subsystem. For installation instructions, see the Configuration chapter. The
following list shows the software required to enable Data Replication Manager:
s Array Controller Software (ACS) Version 8.5P
s Secure Path Version 2.2 (Required for Windows NT)
s Storage Works Command Console (SWCC) Version 2.2 (optional)
Array Controller Software
The HSG80 Array Controller Software (ACS) is the software component of the HSG80
array controller subsystem. ACS software executes on the HSG80 controller and processes
I/O requests from the host, performing the device level operations required to satisfy the
requests.
Secure Path
Secure Path is server-based software that enhances the StorageWorks RAID dual-ported
storage subsystem by providing automatic error recovery from server-to-storage
subsystem connection failures. Secure Path allows you to add redundant Fibre Channel
paths between Windows NT hosts and a RAID storage subsystem, improving overall data
availability. If any component in the path between the host and storage subsystem fails,
Secure Path immediately redirects all pending and subsequent I/O requests from the failed
path to an alternate path, preventing an adapter, cable, or controller failure from disrupting
data access.
For more information on Secure Path, refer to the SecurePath for Windows NT Installation
Guide.
StorageWorks Command Console (optional)
StorageWorks Command Console (SWCC) provides local and remote management of
StorageWorks controllers and their attached storage. SWCC consists of two major
components: the SWCC client and the SWCC agent. SWCC can be used to configure and
manage the DT storage subsystem.
The SWCC client is a graphical user interface (GUI) that runs on a local host and displays
the logical and physical layout and status of a selected subsystem in graphical form.
110 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
The agent is a companion program to the client. This host-resident program is an interface
between the client and the host's storage subsystem that allows the two to communicate
over a network.
For a full description of SWCC and how it operates, refer to the StorageWorks Command
Console Getting Started Guide.
Required Hardware and Software
Table is a checklist of equipment that is mandatory for operating a DT storage subsystem
with Data Replication Manager
Use the list to verify that you have everything, or you may not be able to configure your
system to replicate data in a DT subsystem.
Table 11 Hardware Requirements Checklist and Part Numbers
Required Hardware Part Number Quantity
(at each site)
ESA12000 380590B21 (50 HZ, blue)
Minimum of
380590B22 (50 HZ, opal)
1
380580001 (60 HZ, blue)
380580002 (60 HZ, opal)
Fibre channel gigabit switch
8-port 380591B21 /
DSDSGGAAA
16-port
2
380578B21 /
DSDSGGAAB
Host bus adapter 380574001/ KGPSABC 2
(per system)
Fibre Channel host cables
234457B22 / BNGBX05
5 meters
234457B23 / BNGBX15
15 meters
2
30 meters 234457B24 / BNGBX30
50 meters 234457B25 / BNGBX50
Fibre Channel controller cables (2 meters) 234457B21 / 4
DSBNGBX02
Introduction to Data Replication Manager 1 11
Table 11 Hardware Requirements Checklist and Part Numbers (Continued)
Required Hardware Part Number Quantity
(at each site)
Short-wave Gigabit Interface Converters (GBICs) 380561B21 / 6
DSDXGGASA
ATM Gateway Additional Hardware Part Number Quantity
ATM Gateway 166296-B21 2 per site
ATM Gateway Service Kit 166297-B21 1 per site
Table 12 Software Requirements Checklist and Part Numbers
Required Software Part Number
ACS V8.5P 128698B21 /
QB6CAAASA
Secure Path 2.2.2 380594 001 /
QB6695AAA
SWCC Version 2.2 (optional) N/ A
2
Chapter
Data Replication Manager Concepts
This chapter describes Data Replication Manager concepts for configuring a Data
Replication Manager solution. These descriptions include Remote Copy Sets and
Association Sets.
The topics contained within this chapter are:
s "Remote Copy" on page 22
"Remote Copy Sets" on page 22
"Operation Modes" on page 23
"Outstanding_IO Settings" on page 24
"Suspend/Resume" on page 25
"Error Mode" on page 26
s "Association Sets" on page 26
"FAIL_ALL" on page 27
"W rite History Logging" on page 28
"Log Unit" on page 29
"ORDER_ALL" on page 29
"Failover" on page 210
"Failback" on page 210
22 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Remote Copy
Data Replication Manager uses the peer-to-peer remote copy function of the HSG80
controller to achieve data replication. The HSG80 controller pairs at the initiator site are
connected to their partner HSG80 controller pairs at the target site. Remote Copy Sets are
mirrors of each other and are created from units at the initiator and target sites. As data is
written to a unit at the initiator site, it is mirrored to its remote copy set partner unit at the
target site.
The remote copy feature is intended not only for disaster recovery but to replicate data
from one storage subsystem or physical site to another subsystem or site. It also provides
methods of performing a backup at either the local or remote site. With remote copy, user
applications continue to run while data movement goes on in the background over a
separate interconnect. Data warehousing, continuous computing, and enterprise
applications all require remote copy capabilities. The remote copy feature is the major
component in the Compaq Storageworks Data Replication Manager solution.
Remote Copy Sets
A remote copy set is a bound set of two units, one located on the initiator site and the other
at the target site, for long-distance mirroring. The term "units" is defined as a single disk,
storageset, mirrorset or RAIDset. The local controller is designated as the Initiator. The
initiator acts as the director of the replication process. The corresponding remote
controller is designated as the Target. The target receives I/O requests from the initiator so
as to replicate the data at its location.
The ADD REMOTE_COPY_SETS RemoteCopySetName InitiatorUnitName
RemoteNodeName|TargetUnitName command creates a remote copy set and starts a
normalization copy to the target unit. During normalization, the controllers copy all data
from the initiator unit to the target unit.
Remote copy sets are created only at the initiator site. There can be up to 12 remote copy
sets per controller.
Data Replication Manager Concepts 2 3
Operation Modes
There are two possible remote copy operation modes: Synchronous or Asynchronous.
Figure 21 shows the timeline differences between the two.
Synchronous Operation Mode
In synchronous operation mode, data is simultaneously written to the cache of the initiator
subsystem and the cache of the target subsystems. The I/O completion status is not sent to
the host until all members of the remote copy set are updated. Synchronous operation
ensures the highest possible level of data consistency, which makes this process especially
appropriate for business applications that require a high level of currency. Synchronous is
the default setting.
Asynchronous Operation Mode
In asynchronous operation mode, the write operation is reported to the host as complete
before the data is written to the remote unit of the remote copy set. Asynchronous mode
can provide greater performance and response time, but the data on all members of the
remote copy set cannot be assumed to be the same at all times.
SYNCHRONOUS
Transaction is not complete
until this point
Notify user
Perform task Update data Transmit update Update data
(User) (Primary data (Network) (Recovery site) (Network)
center)
Time
ASYNCHRONOUS
Recovery site updates
may be done at a later time
Transaction is complete
at this point
Perform task Update data Notify user Transmit update Update data
(User) (Primary data (Network) (Network) (Recovery site)
center)
Time
CXO7070A
Figure 21. Remote copy set operation modes
24 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Operation Mode Considerations
s Synchronous replication is appropriate when exact consistency is critical to the
business application. The application or application recovery depends upon data being
written to both local and remote sites when completion is restored.
| 101471-003
118629-002
123995-002
128519-001
128519-002
128519-003
135267-001
135268-001
165144-001
165145-001
166296-B21
166297-B21
387387-003
387401-002
387404-001
387405-003
AA-RFA2D-TE
AA-RFA9B-TE
AA-RHBYA-TE
AA-RHBZA-TE
DS-BA370-Se
EK-DRVMS-TE
EK-HSG84-DT
EK-HSG84-SV
EK-HSG85-CG
EK-HSG85-RG
EK-NTC8K-IG
EK-WNTMP-MH
|
