HP StorageWorks XP Remote Web Console Software - Manual (Page 17)

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. The table below shows the pair statuses and the
results of the RAID Manager commands.
Table 3 Pair Statuses and the Results of the RAID Manager Commands
Pair
Status
RAID Manager Command
paircreate paircreate
−split
pairsplit pairresync pairresync
-restore
pairsplit
-S
pairsplit
-E
SMPL OK No No No No NOP No
COPY NOP No No NOP NOP No No
PAIR /
PFUL
NOP OK OK NOP NOP OK No
PSUS /
PFUS
No NOP NOP OK OK OK No
SMPL(PD) No No No No No NOP No
COPY(RS) NOP No No NOP NOP No No
COPY(RS-R) NOP No No NOP NOP No No
PSUE No No No OK* No OK NOP
OK: The command executes the process and ends normally.
NOP: The command does not execute the process, but ends normally.
No: The command ends abnormally (that is, command rejected).
Note*: If you issue the pairresync command to the pair whose status has changed to PSUE because of
the shortage of the shared memory for the V-VOL management area, the command will be rejected
and end abnormally.
When the command executes the process and ends normally, the pair status changes according to the
process. For information about how the pair status changes when the command ends normally, see
Figure 3 on page 15 and the paragraphs under the figure.
Note : The hide mode (-m noread) on the S-VOL is not supported. If you specify the hide mode on the
S-VOL and create a pair, the command will end normally, but the hide mode will be ignored.
Copy Threshold Option
If the load of the storage system increases, host server I/O performance (response) may be degraded. If
XP Snapshot performs the restore operation when the load of the subsystem is heavy, it is more likely that
host server I/O performance (response) may be degraded. The Copy Threshold option temporarily stops
copy processing caused by the restore operation when the load of the subsystem is heavy. If you set this
option in effect, you can minimize the degradation of host I/O performance by temporarily stopping
copy processing caused by the restore operation when the load of the subsystem is heavy.
The Copy Threshold option is effective only when the load of the subsystem is heavy. When the Copy
Threshold option is in effect, all the copy processing by the restore operation stops. For information about
the setting of the Copy Threshold option, call HP technical support.
Note: Copy operations that are stopped by the Copy Threshold option will resume when the load of the
subsystem become light. If this option is in effect, not only XP Snapshot copy operations, but also the
copy operations of the following program products, will stop when the load of the subsystem is heavy:
• Business Copy
• ShadowImage for Mainframe
XP24000 Snapshot User's Guide 17