HP XP P9500 Storage - Manual (Page 3)

Contents
1 Continuous Access Journal Z overview ..........................................................8
Continuous Access Journal Z software ........................................................................................8
How Continuous Access Journal Z works.....................................................................................8
Hardware and software components...........................................................................................9
P9500 storage systems.......................................................................................................10
Main and remote control units .......................................................................................10
Pair volumes......................................................................................................................11
Journal volumes.................................................................................................................11
Journals............................................................................................................................11
Data path.........................................................................................................................12
Extended consistency groups...............................................................................................12
Remote Web Console ........................................................................................................12
Business Continuity Manager..............................................................................................12
Reference Information..............................................................................................................12
Overview of copy operations...............................................................................................12
Initial copy operation ....................................................................................................13
Update copy operation..................................................................................................13
Read and write I/O during remote copy...............................................................................13
Differential data management..............................................................................................14
S-VOL write option.............................................................................................................14
S-VOL read option.............................................................................................................14
Pair status.........................................................................................................................14
2 Requirements and specifications.................................................................16
System requirements................................................................................................................16
Business Continuity Manager specifications ...............................................................................18
Command device ..................................................................................................................20
3 Planning volumes, P9500 systems...............................................................21
Plan and design workflow .......................................................................................................21
Assessing business requirements for data recovery .....................................................................21
Determining your RPO .......................................................................................................22
Write-workload .....................................................................................................................22
Measuring write-workload...................................................................................................22
Sizing journal volumes ...........................................................................................................23
Planning journals ...................................................................................................................23
Data transfer speed considerations ..........................................................................................24
RAID group configuration ...................................................................................................24
Fibre-channel port configuration...........................................................................................25
Planning journal volumes ........................................................................................................25
Host I/O time stamp .........................................................................................................25
Planning pair volumes ............................................................................................................26
Data and journal volume specifications.................................................................................26
Duplicating VOLSERs .........................................................................................................27
Maximum number of pairs allowed .....................................................................................27
Calculating maximum number of pairs.............................................................................28
Maximum initial copy operations and priorities......................................................................29
Disaster recovery considerations ..............................................................................................30
Error reporting communications (ERC) ..................................................................................30
Sharing volumes with other P9500 software volumes...................................................................31
Planning Cnt Ac-J Z in multiple P9500s using a consistency group.................................................31
Multiple journals per RAID Manager consistency group .........................................................33
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