HP XP Business Copy Software - Manual (Page 20)

T-VOL to the S-VOL. This ensures that the S-VOL and T-VOL are properly resynchronized in the
desired direction, and also greatly reduces the time needed to resynchronize the pair.
•
Pairresync for suspend pair
When a normal/quick resync operation is performed on a suspended pair, the XP storage
system copies all data on the S-VOL to the T-VOL, since all S-VOL tracks were flagged as
difference data when the pair was suspended. Therefore, the normal resync operation for
suspended pairs is equivalent to and takes as long as the SIz initial copy operation. If you
perform the quick resync operation on the suspended pairs, the update copy operation will
be performed and all the data will be copied to the T-VOL. In this case, the update copy
operation will be much more time than the initial copy operation.
•
Resynchronizing all the pairs in the same CTG
A PPRC command enables you to resynchronize all SIz pairs in the same CTG.
Pairresync operation on all the pairs in the same CTG works in Normal Resync. Therefore,
you cannot specify Quick Resync, Reverse Copy, or Quick Restore. To perform Quick Resync,
Reverse Copy, or Quick Restore, you issue the PPRC command on one pair.
Delete Pair Operation
The ShadowImage for Mainframe delete pair operation stops the SIz update copy operations to
the T-VOL of the pair and changes the pair status of both volumes to Simplex. An SIz pair can be
deleted by the user at any time except during the quick split operation (for example, any status
except Simplex and V-split). After you delete an SIz pair, the T-VOL is still not available for write
operations until the reserve attribute is reset.
When a delete pair operation is performed on a pair in Split status, the reserve attribute of the
T-VOL is automatically reset.
The T-VOL of a duplex pair may not be identical to its S-VOL, due to the asynchronous SIz update
copy operations. For information about how to synchronize the volumes before deleting the pair,
see
“Deleting Pairs” (page 84) .
Pair Status
Figure 8 (page 21) illustrates the pair status transitions and the relationship between the pair status
and the SIz operations.
20 About ShadowImage for Mainframe Operations