HP StorageWorks Snapshot XP user guide (T1713-96023, October 2006)

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 softwar e 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 d elete only the snapshot data.

When deleting the Snapshot X P pair itself, snapshot data stored in the pool is deleted and the

relationship between the P-VOL and S-VOL is released. On the o ther hand, if you delete only snapshot

data, the relatio nship between the P-VOL and S-VOL is maintained. When d eleting only snapshot d ata,

the snapshot ID of the deleted snapshot data can be assigned to the newly stored snapshot data of

theSnapshotXPpair.

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 require d time for deleting snapshot data or S napshot XP pai rs is severa l seconds, and sometimes

morethan10minutes.Thetimeincreasesifthedeletedpairusesalargeamountofthepoolorif

multiple pairs are deleted at on e time.

• Themorediskadaptorsusedinthearray,theshorterthetimerequiredfordeletingsnapshotdataor

Snapshot XP pairs. Since the XP10000/S VS200 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 XP1200 0, 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 com mand, but you cannot distinguish between SMPL and SMPL(PD)

volumes. To distinguish b etween 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,

thevolumestatusisSMPL(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 inform a tion, see Deleting Snapshot XP pairs.

Snapshot XP functions