HP StorageWorks XP Remote Web Console Software - Manual (Page 27)

Snapshot XP user guide 27
3. Issue the
pairsplit
command on the Snapshot XP pair in PAIR status to store the snapshot data in
the pool. When the operation completes, the pair status changes to PSUS.
NOTE: If the pool capacity exceeds the threshold when a Snapshot XP pair is in PSUS status, the
pair status changes to PFUS in RAID Manager XP. For more information, see the HP StorageWorks
RAID Manager XP user guide.
4. To delete only snapshot data and leave the Snapshot XP pair, issue the
pairresync
command for
the PSUS or PFUS pair. During the operation, the pair status changes to COPY(RS).
To delete the Snapshot XP pair, issue the
pairsplit-S
command or use Command View XP or XP
Remote Web Console. During the operation, the pair status changes to SMPL(PD).
5. To restore the pair, issue the
pairresync-restore
command on the Snapshot XP pair in PSUS
status. After that, the snapshot data is written back to the P-VOL. During the operation, the pair status
changes to COPY(RS-R). When the operation completes, the pair status changes to PAIR.
6. A pool can contain only a predefined amount of data. If the total capacity of the snapshot data in the
pool exceeds the pool capacity, the pair status changes to PSUE. The pair status also changes to PSUE
when a failure occurs while restoring the pair or when the pool usage rate reaches 100 percent. The
pair status might change to PSUE when a failure occurs during a process other than restoring.
Whether the host can read and write the Snapshot XP pair’s P-VOL or S-VOL depends on the pair status.
Table 6 shows the relationship between the pair status and availability of host access.
CAUTION: If the host computer uses application software to monitor the Snapshot XP pairs’ volumes,
problems, such as abnormal end, might occur. For example, since the S-VOL whose status is not PSUS (or
PFUS) rejects access from the host, a problem might occur on the monitoring application software whose
access is rejected. In addition, if the host computer connects to more than one port, a problem might also
occur on ports that are not connected to the S-VOL that rejected the host access. You must terminate the
application software monitoring the volumes to solve these problems.
Table 6 Whether hosts can access P-VOLs and S-VOLs
Pair status P-VOL S-VOL
Read Write Read Write
SMPL OK OK — —
COPY OK OK No No
PAIR/PFUL OK OK No No
PSUS/PFUS OK OK OK OK
SMPL(PD) OK OK No No
COPY(RS) OK OK No No
COPY(RS-R) OK OK No No
PSUE OK 1
1. If the pair status changes to PSUE because a failure occurred during the restoration, the host cannot access that pair.
OK 1 No No