HP StorageWorks XP Remote Web Console Software - Manual (Page 20)

NOTE:
Copy operations stopped by the Copy Threshold option resume when the array's load become light.
If this option is enabled, copy operations for Snapshot XP and the following software products stop
when the array's load is heavy:
• Business Copy XP
• ShadowImage for z/OS®
• Hitachi FlashCopy Mirroring
• Hitachi FlashCopy Mirroring Version 2
• Flex Copy XP
• Auto LUN XP
Deleting snapshot data or Snapshot XP pairs
The status of the Snapshot XP pair is PSUE (status when failure occurred) when, as a result of writing data
in that pair's volume, the snapshot data's capacity exceeds the pool's capacity specified when the pool
was created. You cannot create Snapshot XP pairs and store snapshot data in the pool. Therefore, you
must delete unnecessary snapshot data. There are two ways to delete snapshot data. One way is to
delete the Snapshot XP pair itself. The other way is to delete only the snapshot data.
When deleting the Snapshot XP pair itself, snapshot data stored in the pool is deleted and the
relationship between the P-VOL and S-VOL is released. On the other hand, if you delete only snapshot
data, the relationship between the P-VOL and S-VOL is maintained. When deleting only snapshot data,
the snapshot ID of the deleted snapshot data can be assigned to the newly stored snapshot data of
the Snapshot XP pair.
To delete snapshot data or Snapshot XP pairs, use a RAID Manager XP command. When deleting
Snapshot XP pairs, you can also use the Pairsplit -S pane in Command View XP or XP Remote Web
Console. For more information, see Deleting snapshot data or Deleting Snapshot XP pairs .
NOTE:
•
After issuing the command to delete snapshot data, no more snapshot data for that Snapshot XP pair
is stored in the pool, even if the host tries to write data in the P-VOL. To store snapshot data for that
Snapshot XP pair again, you must issue the command for storing snapshot data.
• The required time for deleting snapshot data or Snapshot XP pairs is several seconds, and sometimes
more than 10 minutes. The time increases if the deleted pair uses a large amount of the pool or if
multiple pairs are deleted at one time.
• The more disk adaptors used in the array, the shorter the time required for deleting snapshot data or
Snapshot XP pairs. Since the XP10000/SVS200 has a smaller number of disk adaptors than the
XP12000, the XP10000/SVS200 needs a longer time to delete snapshot data or Snapshot XP pairs
than the XP12000, even if the operational conditions are the same.
• When deleting a Snapshot XP pair, the volumes' status becomes SMPL(PD). 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).
Viewing Snapshot XP pair information
You can view information about Snapshot XP pairs, such as snapshot ID or pair status, on the Detail pane
in Command View XP or XP Remote Web Console. For more information, see Deleting Snapshot XP pairs .
20 Snapshot XP functions