Delete pair operation – HP XP Business Copy Software User Manual
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ShadowImage for the XP1024/XP128/XP12000/XP10000/SVS 200
Reverse resync and quick restore cannot be performed on suspended pairs. While the resync operation for
a split pair can be very fast, the resync operation for a suspended pair will take as long as the initial copy
operation.
The XP1024/XP128/XP12000/XP10000/SVS 200 will automatically suspend an SI390 pair when it
cannot keep the pair mirrored for any reason. When the XP1024/XP128/XP12000/XP10000/SVS 200
suspends a pair, sense information is generated to notify the host. The
XP1024/XP128/XP12000/XP10000/SVS 200 will automatically suspend an SI390 pair under the
following conditions:
•
When the XP1024/XP128/XP12000/XP10000/SVS 200 detects an error condition related to an
update copy operation.
•
When the S-VOL and/or T-VOL track map in shared memory is lost (for example, due to offline
microprogram exchange). This applies to SP-pend and V-split pairs only. For duplex, split, resync, or
resync-r pairs, the pair is not suspended but the entire S-VOL (T-VOL for reverse resync) is marked as
difference data.
Use the Suspend Volume Pair window (see ”
” on page 64) to suspend
SI390 pairs. When a pair is suspended, the pair status changes to suspended. When the resync operation
starts, the pair status changes to resync. The S-VOL remains fully accessible while suspended and during
the resync operation. Use the Resynchronize Volume Pair window (see ”
” on page 62) to resynchronize suspended SI390 pairs.
NOTE:
The PPRC commands do not support the SI390 suspend operation. You must use the SI390 remote
console software to suspend SI390 pairs. The CSUSPEND and PPRCOPY SUSPEND commands execute an
SI390 split operation instead of a suspend operation. For more information on using PPRC commands to
perform SI390 operations on the XP1024/XP128/XP12000/XP10000/SVS 200, see ”
Delete Pair Operation
The SI390 delete pair operation stops the SI390 update copy operations to the T-VOL of the pair and
changes the pair status of both volumes to simplex. An SI390 pair can be deleted by the user at any time
except during the quick split operation (that is, any status except simplex and V-split). After you delete an
SI390 pair, the T-VOL is still not available for write operations until the reserve attribute is reset.
Use the Delete Volume Pair window (see ”
” on page 65) to delete SI390
pairs. When an SI390 pair is deleted, pending update copy operations for the pair are discarded, and
the status of the S-VOL and T-VOL is changed to simplex.
CAUTION:
The T-VOL of a duplex pair may not be identical to its S-VOL, due to the asynchronous SI390
update copy operations. To synchronize the volumes before deleting the pair, you must split the pair first
(see ”
” on page 65 for instructions).