HP XP P9000 Continuous Access Journal for Mainframe Systems User Guide

Fibre-channel port configuration
The fibre-channel ports on your P9500 system have an IOPS threshold. Use the performance
monitoring information for the number of IOPS your production system generates to calculate the
number of fibre-channel ports the Cnt Ac-J Z system requires.
Please see “Planning ports for data transfer ” (page 46) for a full discussion on the type and number
of fibre-channel ports required for your system.
Planning journal volumes
In addition to sizing journal volumes, you should be aware of the following requirements and
restrictions.
• Journal volumes must be registered in a journal before the initial pair-copy operation is
performed.
• Journal volumes must be registered on both the local and remote systems.
• Primary and secondary EXCTGs must be set up and journals registered to them before
registering journal volumes in journals.
• Emulation type for journal volumes must be OPEN-V.
• Journal volumes should be sized according to RPO and write-workload. See “Sizing journal
volumes ” (page 23) for more information.
• If a path is defined from a host to a volume, the volume cannot be registered as a journal
volume.
• Journal volumes in a journal can have different capacities.
• A master journal volume and the corresponding restore journal volume can have different
capacities.
• A data volume and its associated journal volume can belong to only one journal.
• Do not register a volume to a journal during quick formatting. Doing so stalls the operation.
• Data volumes and journal volumes in the same journal must belong to the same controller.
• The number of journal volumes in the master journal does not have to be equal to the number
of volumes in the restore journal.
• Journal volumes consist of two areas: One area is used for storing journal data, and the other
area is used for storing metadata for remote copy.
• Journal volumes support all RAID configurations and physical volumes that are supported by
P9500.
• Journal volume capacity is not included in accounting capacity.
• Prior to registering journal volumes, set up primary and secondary EXCTGs, if necessary. See
“Using extended consistency groups” (page 51).
• Customized volumes can be used for journal volumes.
See the following for more information about journals and journal volumes:
• The “Journals” item in “System requirements” (page 16)
• “Planning journals ” (page 23)
• “Data and journal volume specifications” (page 26)
Host I/O time stamp
The I/O time stamping function must be installed on the host processor at the primary site in order
to provide data consistency in Cnt Ac-J Z journals. The I/O time stamp, which is provided by MVS
DFSMSdfp, is the same time stamp that is used by Compatible XRC pairs. The I/O time stamping
Planning journal volumes 25