HP XP P9500 Storage - Manual (Page 3)

Contents
1 Continuous Access Journal overview ............................................................8
Continuous Access Journal software ...........................................................................................8
How Continuous Access Journal 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
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, P9500 systems...............................................................18
Plan and design workflow .......................................................................................................18
Assessing business requirements for data recovery .....................................................................18
Determining your RPO .......................................................................................................19
Write-workload .....................................................................................................................19
Measuring write-workload...................................................................................................19
Sizing journal volumes ...........................................................................................................20
Planning journals ...................................................................................................................20
Data transfer speed considerations ..........................................................................................21
RAID group configuration ...................................................................................................21
Fibre-channel port configuration...........................................................................................21
Planning journal volumes ........................................................................................................22
Planning pair volumes ............................................................................................................22
Maximum number of pairs allowed .....................................................................................23
Calculating maximum number of pairs.............................................................................23
Maximum initial copy operations and priorities......................................................................24
Disaster recovery considerations ..............................................................................................25
Host failover software ........................................................................................................25
Sharing volumes with other P9500 software volumes...................................................................26
Planning Cnt Ac-J in multiple P9500s using a consistency group...................................................26
Multiple journals per RAID Manager consistency group .........................................................27
3DC configurations using 3 Cnt Ac-J sites..............................................................................29
Planning for previous models ...................................................................................................29
Guidelines for preparing systems for Cnt Ac-J ............................................................................30
System option modes .........................................................................................................31
4 Planning the data path..............................................................................34
Data path design workflow .....................................................................................................34
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