HP XP7 Continuous Access Journal User Guide (TK911-96002)

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Contents

1 Continuous Access Journal overview ............................................................8

Continuous Access Journal software ...........................................................................................8

How Continuous Access Journal works........................................................................................8

Hardware and software components...........................................................................................9

XP7 storage systems...........................................................................................................10

Pair volumes......................................................................................................................11

Journal volumes.................................................................................................................11

Journals............................................................................................................................11

Data path.........................................................................................................................11

Consistency groups and journals..........................................................................................12

Remote Web Console ........................................................................................................12

RAID Manager (RAID Manager)..........................................................................................12

Reference Information..............................................................................................................12

Overview of copy operations...............................................................................................12

Initial copy operation ....................................................................................................12

Update copy operation..................................................................................................13

Read and write I/O during remote copy...............................................................................13

Differential data management..............................................................................................13

S-VOL write option.............................................................................................................14

Pair status.........................................................................................................................14

2 Requirements and specifications.................................................................15

System requirements................................................................................................................15

3 Planning volumes, XP7 systems...................................................................19

Plan and design workflow .......................................................................................................19

Assessing business requirements for data recovery .....................................................................19

Determining your RPO .......................................................................................................20

Write-workload .....................................................................................................................20

Measuring write-workload...................................................................................................20

Data transfer speed considerations ..........................................................................................21

RAID group configuration ...................................................................................................21

Fibre-channel port configuration...........................................................................................21

Sizing journal volumes ...........................................................................................................21

Planning journals ...................................................................................................................22

Planning journal volumes ........................................................................................................23

Planning pair volumes ............................................................................................................23

Maximum number of pairs allowed .....................................................................................24

Calculating maximum number of pairs.............................................................................25

Maximum initial copy operations and priorities......................................................................26

Disaster recovery considerations ..............................................................................................27

Host failover software ........................................................................................................27

Sharing volumes with other XP7 software volumes.......................................................................27

Planning Cnt Ac-J in multiple XP7s using a consistency group.......................................................27

Planning for previous models ...................................................................................................29

Guidelines for preparing systems for Cnt Ac-J ............................................................................30

System option modes .........................................................................................................30

4 Planning the data path..............................................................................33

Data path design workflow .....................................................................................................33

Sizing bandwidth ..................................................................................................................33

Five sizing strategies ..........................................................................................................33

Calculating bandwidth ......................................................................................................34

Contents 3