Table 5 whether hosts can access p-vols and s-vols, 5 whether hosts can access p-vols and s-vols – HP StorageWorks XP Remote Web Console Software User Manual
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1.
If a volume is not assigned to a Snapshot XP pair, its status is SMPL.
2.
Issue the
paircreate
command on the SMPL volume to create a Snapshot XP pair. When creating
the first pair for the P-VOL, the pair status changes to COPY. When the operation completes, the pair
status changes to PAIR. If you specify a volume that is already paired with one or more S-VOLs as the
P-VOL to create another pair, the pair status does not change to COPY. When the operation completes,
the pair status changes to PAIR.
NOTE:
• If you execute the
paircreate
command immediately after deleting the P-VOL’s last snapshot
data, it might take time to create a new pair.
• If the pool capacity exceeds the threshold when a Snapshot XP pair is in PAIR status, the pair
status changes to PFUL in RAID Manager. For more information, see the HP StorageWorks RAID
Manager XP User Guide.
• If you issue the
paircreate
command when the pool capacity exceeds the threshold, the
command is rejected and the pair cannot be created.
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. 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.
shows the relationship between the pair status and availability of host access.
Table 5
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)
No
No
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