HP XP7 Continuous Access Journal for Mainframe Systems User Guide (TK911-96001)

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Contents

1 Continuous Access Journal Z overview ..........................................................9

Continuous Access Journal Z software ........................................................................................9

How Continuous Access Journal Z works.....................................................................................9

Hardware and software components.........................................................................................10

XP7 storage systems...........................................................................................................11

Pair volumes......................................................................................................................12

Journal volumes.................................................................................................................12

Journals............................................................................................................................12

Data path.........................................................................................................................13

Consistency groups and journals..........................................................................................13

Extended consistency groups...............................................................................................13

Remote Web Console ........................................................................................................13

Business Continuity Manager..............................................................................................13

Reference Information..............................................................................................................14

Overview of copy operations...............................................................................................14

Initial copy operation ....................................................................................................14

Update copy operation..................................................................................................14

Read and write I/O during remote copy...............................................................................14

Differential data management..............................................................................................15

S-VOL write option.............................................................................................................15

S-VOL read option.............................................................................................................15

Pair status.........................................................................................................................15

2 Requirements and specifications.................................................................16

System requirements................................................................................................................16

Business Continuity Manager specifications ...............................................................................19

SAID values for CESTPATH/YKBLDPTH..................................................................................19

Command device ..................................................................................................................21

3 Planning volumes, XP7 systems...................................................................22

Plan and design workflow .......................................................................................................22

Assessing business requirements for data recovery .....................................................................22

Determining your RPO .......................................................................................................23

Write-workload .....................................................................................................................23

Measuring write-workload...................................................................................................23

Data transfer speed considerations ..........................................................................................24

RAID group configuration ...................................................................................................24

Fibre-channel port configuration...........................................................................................24

Sizing journal volumes ...........................................................................................................24

Planning journals ...................................................................................................................25

Planning journal volumes ........................................................................................................26

Host I/O time stamp .........................................................................................................26

Planning pair volumes ............................................................................................................27

Data and journal volume specifications.................................................................................27

Duplicating VOLSERs .........................................................................................................28

Maximum number of pairs allowed .....................................................................................28

Calculating maximum number of pairs.............................................................................29

Maximum initial copy operations and priorities......................................................................30

Disaster recovery considerations ..............................................................................................31

Error reporting communications (ERC) ..................................................................................31

Sharing volumes with other XP7 software volumes.......................................................................32

Planning Cnt Ac-J Z in multiple XP7s using a consistency group.....................................................32

Contents 3