HP StorageWorks Snapshot XP user guide (T1713-96023, October 2006)
Snapshot XP seco
ndary volumes
Table 3 Requirements for Snapshot XP S -VOLs
Item
Requirement
Volume type
V-VOL
You cannot specify the following volumes as Snapshot XP S-VOLs:
• Volumes used as a Snapshot XP pair's S-VOL
• Volumes used by another software product's pair or migration plan
NOTE:
ALUSES-VOLmustbepairedwithaP-VOLthathasthesamesizeandstructure.
Emulation type
OPEN-V
Maximum number
8,191
For more informa tion about the maximum number of Snapshot X P pairs you can
create, see Calculating the number of Snapshot XP pairs you can create.
Path definition
Required
Snapshot XP pool volumes
Table 4 Requirements for Snapshot XP pool-VOLs
Item
Requirement
Volume type Logical volume (LDEV)
You cannot specify the following volumes as Snapshot XP pool-VOLs:
• LUSE volumes
• VolumesusedasaSnapshotXPpair'sP-VOLorS-VOL
• Volumes used by another software product's pair or migration plan
• Volumes set with the Protect or Read Only attribute, or set to the S-VOL Disable
setting by LUN Security XP Extension
• NAS volumes
Emulation type
OPEN-V
Maximum number
131,072
However, the maximum number of pool-VOLs that can be registered in each pool is
1,024. In addition, a volume already registered as a pool-VOL in a pool cannot
be registered in anoth er pool.
Path definition
Not required
Volumeswithpathdefinitions cannot b e specified as pool- VOLs.
Creating virtual volume management areas
To use Snapshot XP, you must create virtual volume (V-VOL) management are as. The V-VO L m anagement
area is an impor tant area for associating S napshot XP S-VOLs (V-VOL) with pool-VOLs. The V-VOL
management area is automatically created when additional shared memory is installed. For more
inform ation about shared memory requirements, see Table 5. To install additional shared memory,
contact your HP acc ount support representative.
There are two areas in the V-VOL management area: pool management block and pool association
inform ation. When creating pools or Snapshot XP pairs, the pool management block or pool association
information is stored in the V-VOL management area. Therefore, the V-VOL management area's available
capacity decreases. When all the V -VOL management area's capacit y is used, the capacity ratio of the
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Snapshot XP functions