Creating snapshot xp pairs, Storing snapshot data, Restoring snapshot xp pairs – HP StorageWorks XP Remote Web Console Software User Manual
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Snapshot XP functions
2.
Create a Snapshot XP pair.
3.
Store the snapshot data in the pool.
4.
Execute the command again to recognize the device.
NOTE:
•
Servers (including RAID Manager XP) show V-VOLs with emulation type 0 (for example, OPEN-0V).
When creating a Snapshot XP pair, specify the volume with emulation type 0, such as OPEN-0V, as the
S-VOL.
•
Before creating a V-VOL, you must define a V-VOL group. The emulation type of the V-VOLs and the
emulation type of the VDEV for a V-VOL group are OPEN-V. In addition, the VDEV’s capacity is always
2 TB. Therefore, the maximum capacity of a V-VOL is also 2 TB.
To delete a V-VOL, use the V-VOL pane in Command View XP or XP Remote Web Console. For more
information, see ”
Creating or deleting virtual volumes
Creating Snapshot XP pairs
A Snapshot XP pair uses a V-VOL as its S-VOL. Therefore, you must create a V-VOL before creating a
Snapshot XP pair. In Snapshot XP, you can specify up to 64 S-VOLs for a P-VOL.
To create Snapshot XP pairs, use a RAID Manager XP command. For more information, see ”
CAUTION:
When creating Snapshot XP pairs, you decide which pool the pairs use. If you create two or
more Snapshot XP pairs that share the same P-VOL, you must specify the same pool for these pairs. For
example, if you specify three S-VOLs for one P-VOL, you must specify the same pool for these three pairs.
NOTE:
When deleting a Snapshot XP pair, the volumes’ status becomes SMPL(PD). You cannot create
pairs using SMPL(PD) volumes. If the volumes are in SMPL(PD) status, wait for a while and issue the
command to create pairs after the volumes’ status changes to SMPL.
Use the Business Copy XP main pane to see the volume’s status. Using RAID Manager XP, you can check
the volume status with the
pairdisplay
command, but you cannot distinguish between SMPL and
SMPL(PD) volumes. To distinguish between SMPL and SMPL(PD) volumes using RAID Manager XP, issue
the
inqraid
command as well. The
inqraid
command shows whether Snapshot XP is using the
volume. If Snapshot XP is not using the volume, the volume status is SMPL. If Snapshot XP is using the
volume, the volume status is SMPL(PD).
Storing snapshot data
Snapshot data is a replica of data in a Snapshot XP pair’s P-VOL, and is stored in a pool. When the
P-VOL is updated, updated data is copied to the pool as snapshot data before the P-VOL is updated. This
process is called storing snapshot data.
If you issue a command to a Snapshot XP pair to store snapshot data, the snapshot data is stored in the
pool when a host issues a write request to the Snapshot XP pair’s P-VOL.
To store snapshot data in a pool, use a RAID Manager XP command. For more information, see ”
Restoring Snapshot XP pairs
Snapshot XP can restore a P-VOL’s contents to the state when the snapshot data was stored in the pool by
writing the snapshot data back to the P-VOL. Writing the snapshot data to the P-VOL is called restoration
of a Snapshot XP pair.