HP XP7 Storage User Manual
Page 16
After you re-establish a relationship by using the Fast Reverse Restore function, the contents of the
new S-VOL are not ensured, as they will be changed by any host write operations.
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
.
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 the T-VOL.
When you perform the Fast Reverse Restore function, only the updated data is copied from the
newly specified S-VOL (former T-VOL) to the T-VOL (former S-VOL) as with ordinary relationship
re-establishment. The updated Data 2A in the target volume is then lost (as shown in the following
figure).
The following figure shows the workflow that occurs from the time of establishing a Compatible
FlashCopy relationship with the Incremental FlashCopy function to the time of executing the update
copy operation (Fast Reverse Restore).
Figure 11 Performing Fast Reverse Restore
FlashCopy-to-PPRC Cnt Ac-S Z primary volume function (Compatible
FlashCopy only)
The FlashCopy to PPRC (Peer-to-Peer Remote Copy) primary volume function enables you to share
Compatible FlashCopy T-VOLs and Cnt Ac-S Z P-VOLs. When you share Compatible FlashCopy
T-VOLs and Cnt Ac-S Z P-VOLs, the status of the Cnt Ac-S Z pairs must be Duplex, Pending duplex,
or Suspend. Also, you can either create Cnt Ac-S Z pairs after creating Compatible FlashCopy
16
About Compatible FlashCopy