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..................................................................................................................13
Overview of copy operations...................................................................................................13
Initial copy operation ........................................................................................................13
Update copy operation ......................................................................................................14
Read and Write I/O operations during remote copy operation.....................................................15
S-VOL write option..................................................................................................................15
Difference management...........................................................................................................15
Pair status..............................................................................................................................15
2 Requirements and specifications.................................................................17
System requirements................................................................................................................17
3 Planning volumes and systems....................................................................20
Plan and design workflow .......................................................................................................20
Assessing business requirements for data recovery .....................................................................20
Determining your RPO .......................................................................................................21
Write-workload .....................................................................................................................21
Measuring write-workload...................................................................................................21
Sizing journal volumes ...........................................................................................................22
Determining the required journal volume capacity..................................................................22
Calculating the journal size.................................................................................................23
Planning journals ..............................................................................................................23
Data transfer speed considerations ..........................................................................................23
RAID group configuration ...................................................................................................24
Fibre Channel port configuration..........................................................................................24
Planning journal volumes ........................................................................................................24
Planning pair volumes ............................................................................................................25
Maximum number of pairs allowed .....................................................................................25
Calculating maximum number of pairs.............................................................................25
Priority set for initial copy operations and scheduling order.....................................................26
Disaster recovery considerations ..............................................................................................28
Host failover software ........................................................................................................28
Sharing volumes with Continuous Access Synchronous, other program products..............................28
Planning for Continuous Access Journal with multiple P9500 systems ............................................29
Multiple journals per RAID Manager consistency group .........................................................29
Planning for previous models ...................................................................................................31
Guidelines for preparing systems for Continuous Access Journal ...................................................32
System option modes .........................................................................................................33
4 Planning the data path..............................................................................35
Data path design workflow .....................................................................................................35
Contents 3