HP P9000 for Compatible FlashCopy Mirroring User Guide (AV400-96388, October 2011)

The following figure shows the workflow for establishing the relationship (using Compatible
FlashCopy) to the executing of the update copy operation using the Incremental FlashCopy function.
Figure 7 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 reestablished by the Fast Reverse Restore function, and
then the relationship was reestablished by the Restore function twice more.
For details about Fast Reverse Restore function, see “Fast Reverse Restore function” (page 13).
Reverse Restore function
The 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 Incremental FlashCopy
function. This reversal reestablishes 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.
12 About Compatible FlashCopy operations