HP StorageWorks XP Remote Web Console Software - Manual (Page 40)

Fast Reverse Restore Function
The Fast Reverse Restore function allows you to simplify data recovery in a time of disaster. This
recovery function reverses the original S-VOL and T-VOL relationship established by the Version 2
relationships function. This reversal re-establishes the relationship, with the data flowing in the
opposite direction. However, you cannot perform the Fast Reverse Restore function in the following
cases:
•
If the relationships to be reversed include a relationship established with multiple volumes
•
If the S-VOL capacity exceeds the T-VOL capacity in the relationship to be reversed
•
If the original relationship was re-established using the Fast Reverse Restore function
•
If the S-VOL or the T-VOL is an external volume.
You can perform the Fast Reverse Restore function on a relationship established in NOCOPY mode
or on a relationship undergoing the copy process. If you perform the Fast Reverse Restore function
while undergoing copy processing, the copy process will end.
After you re-establish a relationship using the Fast Reverse Restore function, the contents of the new
S-VOL are not guaranteed.
You can judge whether the Fast Reverse Restore function can be used by examining the results of
the FLASHCOPY QUERY RELATIONS command of ICKDSF. For details, see
(page 128) .
When you perform the Fast Reverse Restore function by using the Incremental FlashCopy function,
only the updated data is copied from the newly specified S-VOL to T-VOL.
When you perform the Fast Reverse Restore function without the use of the Incremental FlashCopy
function, already copied data is copied from newly specified S-VOL to T-VOL.
(page 41) shows the workflow that occurs from establishing the Version 2 relationship using the
Incremental FlashCopy function to executing of the update copy operation (Fast Reverse Restore).
40 About Version 2 Operations