HP XP7 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
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
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