HP XP7 Storage - Manual (Page 3)

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
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