HP StorageWorks XP Remote Web Console Software User Manual
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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 usage rate
of the pool reaches 100 percent. The pair status may change to PSUE when the failure occurs
during a process other than restoring.
Whether the host can read and write the P-VOL or S-VOL of an XP Snapshot pair depends on the
status of the pair.
shows the relationship between the pair status and the
availability of the host access.
Table 2 Whether Hosts Can Access P-VOL and S-VOL
S-VOL
P-VOL
Pair Status
Write
Read
Write
Read
—
—
Yes
Yes
SMPL
No
No
Yes
Yes
COPY
No
No
Yes
Yes
PAIR/PFUL
Yes
Yes
Yes
Yes
PSUS/PFUS
No
No
Yes
Yes
SMPL(PD)
No
No
Yes
Yes
COPY(RS)
No
No
Yes
Yes
COPY(RS-R)
No
No
Yes*
Yes*
PSUE
Yes: Host can access the volume.
No: Host cannot access the volume.
*: If the pair status changes to PSUE because of a failure during restoration, the host cannot access
that pair.
CAUTION:
If the host computer uses application software to monitor the volumes of the XP
Snapshot pairs, problems such as an abnormal end may occur. For example, because the S-VOL
whose status is not PSUS (or PFUS) rejects the access from the host, problems may occur on the
monitoring application software whose access is rejected. In addition, if the host computer connects
to more than one port, problems may also occur on the ports that are not connected to the S-VOL
that rejected the host access. You need to terminate the application software which monitors the
volumes in order to solve these problems.
Use RAID Manager commands to operate XP Snapshot pairs. However, whether or not the
operations complete normally depends on the status of the pairs.
shows the
pair statuses and the results of the RAID Manager commands.
Table 3 Pair Statuses and the Results of the RAID Manager Commands
RAID Manager Command
Pair Status
pairsplit -E
pairsplit -S
pairresync
-restore
pairresync
pairsplit
paircreate
−split
paircreate
No
NOP
No
No
No
No
Yes
SMPL
No
No
NOP
NOP
No
No
NOP
COPY
No
Yes
NOP
NOP
Yes
Yes
NOP
PAIR / PFUL
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About XP Snapshot Operations