HP XP7 Storage - Manual (Page 14)

Figure 9 Incremental FlashCopy
The previous figure shows Data 2A managed as differential data. If you re-execute the command
to establish the relationship, only the differential data of Data 2A is copied to the T-VOL.
However, you cannot perform the Restore function:
•
When the original relationship was established without using the Incremental FlashCopy
function.
•
When the original relationship was re-established by the Fast Reverse Restore function, and
then the relationship was re-established by the Restore function twice more.
For details about Fast Reverse Restore function, see (page 15) .
Reverse Restore function (Compatible FlashCopy only)
The Reverse Restore function enables 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 Incremental
FlashCopy 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 T-VOL capacity exceeds the S-VOL capacity in the relationship being reversed.
•
If the original relationship was re-established using the Fast Reverse Restore function.
For details about Fast Reverse Restore function, see (page 15) .
14 About Compatible FlashCopy