HP Hitachi ShadowImage for Mainframe User Guide (T5213-96032, November 2011)

reverse copy operation is resync-r, and the S-VOL and T-VOL become inaccessible to all hosts
for write operations during a reverse copy operation. As soon as the reverse copy operation
is complete, the S-VOL becomes accessible.
• Quick Restore (backward pairresync in fast speed)
The quick restore operation (see Figure 7 (page 18)) speeds up the reverse copy operation
by changing the volume map in the XP storage system to swap the contents of the S-VOL and
T-VOL without copying the T-VOL data to the S-VOL. The S-VOL (used to be the T-VOL) and
T-VOL (used to be the S-VOL) are resynchronized when update copy operations are performed
for pairs in the duplex status.
The pair status during a quick restore operation is resync-r until the volume map change is
complete. The S-VOL and T-VOL become inaccessible to all hosts for write operations during
the quick restore operation.
◦ After the quick restore operation is executed, the Remote Web Console window may
display old configuration information on components such as logical volumes (LDEVs);
the window may display configurations before the quick restore operation is performed.
To refresh configuration information on the Remote Web Console window, wait until the
quick restore operation completes, click File, and then Refresh on the menu bar of the
window.
◦ If the differential data between S-VOL and T-VOL is small, the reverse copy operation
may be completed faster than the quick restore operation.
◦ If you create a pair by using an encrypted volume and a non-encrypted volume and then
execute quick restore, the S-VOL encryption status and the T-VOL encryption status will
be reversed. For example, if you perform quick restore on an encrypted S-VOL and a
non-encrypted T-VOL, S-VOL will be a non-encrypted volume, and T-VOL will be an
encrypted volume.
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