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 .......................................................................................11
Pair volumes......................................................................................................................11
Journal volumes.................................................................................................................11
Journals............................................................................................................................11
Data path.........................................................................................................................12
Extended consistency groups...............................................................................................12
Remote Web Console ........................................................................................................12
Business Continuity 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
S-VOL read option..................................................................................................................15
Difference management...........................................................................................................15
Pair status..............................................................................................................................16
2 Requirements and specifications.................................................................17
System requirements................................................................................................................17
Business Continuity Manager specifications ...............................................................................19
Command device ..................................................................................................................21
3 Planning volumes, 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
Sizing journal volumes............................................................................................................24
Determine the required journal volume capacity.....................................................................24
Calculating the journal size.................................................................................................25
Planning journals...............................................................................................................25
Data transfer speed considerations...........................................................................................26
RAID group configuration....................................................................................................26
Fibre Channel port configuration..........................................................................................26
Planning journal volumes.........................................................................................................26
Host I/O time stamp..........................................................................................................27
Planning pair volumes.............................................................................................................27
Data and journal volume specifications.................................................................................27
Duplicating VOLSERs..........................................................................................................28
Maximum number of pairs allowed .....................................................................................29
Calculating maximum number of pairs.............................................................................29
Priority set for initial copy operations and scheduling order.....................................................30
Disaster recovery considerations ..............................................................................................31
Error reporting communications (ERC)...................................................................................32
Sharing volumes with Continuous Access Synchronous Z, other program products...........................32
Planning for Continuous Access Journal Z with multiple P9500 systems..........................................32
Contents 3