Restrictions on journal volumes – HP StorageWorks XP Remote Web Console Software User Manual
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Journal volumes in the same journal group can be of different capacity. A master journal
volume and the corresponding restore journal volume can be of different capacity.
A journal volume consists of two areas: one area is used for storing journal data, and the
other area is used for storing metadata for remote copy.
•
RAID configuration:
Journal volumes support all RAID configurations that are supported by XP. Journal volumes
also support all physical volumes that are supported by XP disk array.
•
Support for program products:
The volumes on which XP Cache LUN settings are made can be used for journal volumes.
CAUTION:
Volumes containing a VMA (volume management area) cannot be used as journal
volumes. For detailed information about a VMA, see the HP StorageWorks LUN Security XP
Extension user guide.
Restrictions on Journal Volumes
•
Registering journal volumes:
CAUTION:
You must register journal volumes in a journal group before you create a data
volume pair for the first time in the journal group.
You can add journal volumes under any of the following conditions:
◦
When the journal group does not contain data volumes (that is, before you create a data
volume pair for the first time in the journal group, or after all data volume pairs are
released)
◦
When all data volume pairs in the journal group are suspended.
◦
When processing for changing the status of a data volume pair (for example, release or
suspension of a data volume pair) is not in progress
◦
When no Cache Residency Manager settings are set on the volumes.
If a path is defined from a host to a volume, you cannot register the volume as a journal
volume.
You can use XP Remote Web Console computers 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 metadata area of the journal volume
(see the next section) will be unused and only the journal data area will be used. To make the
metadata area usable, you need to split (suspend) all the data volume pairs in the journal
group and then restore (resynchronize) the pairs.
Adding journal volumes during a remote copy operation will not decrease the metadata usage
rate if the metadata usage rate is high.
Adding journal volumes during a remote copy operation may not change the journal data
usage rate until the journal volumes are used. To check the journal data usage rate, use the
Usage Monitor window (see
).
•
Deleting journal volumes:
You can delete journal volumes under any of the following conditions:
◦
When the journal group does not contain data volumes (that is, before you create a data
volume pair for the first time in the journal group, or after all data volume pairs are
released)
◦
When all data volume pairs in the journal group are suspended.
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