Journal volume restrictions – HP XP Continuous Access Software User Manual
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Volumes in parity groups with a RAID-5 (7D+1P) configuration are usually used as journal
volumes.
•
Support for optional programs
CAUTION:
You cannot use volumes containing a volume management area (VMA) as journal
volumes. For more information, see the HP StorageWorks LUN Security XP Extension user
guide.
Journal volume restrictions
•
Registering journal volumes
CAUTION:
You must register journal volumes in a journal group before creating a data
volume pair in the journal group for the first time.
You can add journal volumes under any of the following conditions:
◦
The journal group does not contain data volumes (that is, before creating a data volume
pair in the journal group for the first time, or after deleting all data volume pairs)
◦
All data volume pairs in the journal group are suspended
◦
Processing for changing a data volume pair's status (for example, deleting or suspending
a data volume pair) is not in progress
◦
No XP Cache LUN Software settings are set on the volumes
NOTE:
If a path from a host to a volume is defined, you cannot register the volume as a
journal volume.
You can use XP Command View Advanced Edition Software management stations or XP
Remote Web Console to register journal volumes.
If you add a journal volume when a remote copy operation is in progress (that is, when at
least one data volume pair exists for data copying), the journal volume's metadata area (see
) is unused, and only the journal data area is used. To make the metadata
area usable, split (suspend) all data volume pairs in the journal group, and restore
(resynchronize) the pairs.
Adding journal volumes during a remote copy operation does not decrease the metadata
usage rate if the metadata usage rate is high.
Adding journal volumes during a remote copy operation might not change the journal data
usage rate until the journal volumes are used. To check the journal data usage rate, use the
Usage Monitor pane (see
Monitoring remote copy operations
).
•
Deleting journal volumes
You can delete journal volumes under any of the following conditions:
◦
The journal group does not contain data volumes (that is, before creating a data volume
pair in the journal group for the first time, or after deleting all data volume pairs)
◦
All data volume pairs in the journal group are suspended
You can use XP Command View Advanced Edition Software management stations or XP
Remote Web Console to delete journal volumes.
•
Access from hosts to journal volumes
If a path from a host to a volume is defined, you cannot register the volume as a journal
volume.
16
Overview of XP Continuous Access Journal