Recovering with and without the fast reverse restore feature

The fast reverse restore feature, when used with Global Mirror functions, allows a FlashCopy relationship to be reversed without waiting for the background copy of the original FlashCopy to complete.

You can reverse a FlashCopy relationship that has change recording enabled and restore the tracks from the target volume to the source volume. However, the background copy process of the original FlashCopy must complete before you can reverse the order of the FlashCopy relationship to its original source and target relationship.

With the fast reverse restore feature, you can reverse a FlashCopy relationship that has change recording enabled without waiting for the background copy of the original FlashCopy to complete. It is not required that you use the fast reverse restore feature during disaster recovery operations; however, the time to recover could be significantly longer if you do not.

• Recovering from a disaster using the fast reverse process
  Use this process for the Global Mirror fast reverse restore feature, which allows a FlashCopy relationship to be reversed without waiting for the background copy of the original FlashCopy to complete.
• Recovering from a disaster without the fast reverse process
  Use this procedure in place of the fast reverse process. The fast reverse process allows a FlashCopy relationship to be reversed without waiting for the background copy of the original FlashCopy to complete.