Whether hosts can access p-vols and s-vols – HP StorageWorks XP Remote Web Console Software User Manual
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3.
Issue the pairsplit command on the XP Snapshot 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 XP Snapshot pair is in PSUS status, the
pair status changes to PFUS in XP RAID Manager. For more information, see the
HP
StorageWorks XP RAID Manager user guide.
4.
To delete only snapshot data and leave the XP Snapshot pair, issue the pairresync command for
the PSUS or PFUS pair. During the operation, the pair status changes to COPY(RS).
To delete the XP Snapshot 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 XP Snapshot 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 XP Snapshot pair's P-VOL or S-VOL depends on the pair
status.
on page 30 shows the relationship between the pair status and availability of host
access.
Table 7 Whether hosts can access P-VOLs and S-VOLs
S-VOL
P-VOL
Pair status
Write
Read
Write
Read
—
—
OK
OK
SMPL
No
No
OK
OK
COPY
No
No
OK
OK
PAIR/PFUL
OK
OK
OK
OK
PSUS/PFUS
No
No
OK
OK
SMPL(PD)
No
No
OK
OK
COPY(RS)
No
No
OK
OK
COPY(RS-R)
No
No
OK
1
OK
1
PSUE
1
If the pair status changes to PSUE because a failure occurred during the restoration, the host cannot access that pair.
Using XP Snapshot
30