HP XP24000/XP20000 for FlashCopy Mirroring Software User Guide (T5240-96012, November 2011)

function. This reversal re-establishes the relationship with the data flowing in the opposite direction.
However, you cannot perform the Reverse Restore function in the following cases:
• If the original relationship was established without using the Incremental FlashCopy function
• If a copy operation established in COPY mode is not yet completed
• If the original relationship was established in NOCOPY mode
• If the relationship being reversed includes a relationship established with multiple volumes
• If the S-VOL capacity exceeds the T-VOL capacity in the relationship being reversed
• If the original relationship was re-established using the Fast Reverse Restore function
• If the S-VOL or T-VOL is an external volume.
For details about Fast Reverse Restore function, see (page 40).
You can judge whether the Reverse Restore function can be used by examining the results of the
FLASHCOPY QUERY RELATIONS command of ICKDSF. For details, see (page 129).
When you perform Reverse Restore, only the updated data is copied from newly specified S-VOL
to T-VOL.
(page 39) shows the workflow from establishing the Version 2 relationship by the Incremental
FlashCopy function to executing the update copy operation (Reverse Restore).
Figure 20 Performing Reverse Restore after Incremental FlashCopy Function is Used
Reverse Restore Function 39