Failover process for PPRC-XD in a planned outage

In a PPRC-XD environment, data must be allowed to drain from the A volumes to the B volumes before the PPRC pair is suspended prior to initiating Failover processing.

Figure 1. Failover in a PPRC-XD Environment

1. Quiesce applications at the primary site to reduce the risk of data loss.
2. Allow data to drain from A volumes to B volumes.
3. Suspend the PPRC pairs using the PPRC Suspend command.
4. Issue the PPRC Establish Pair command to the A volume as the DEVN, specifying the FAILOVER ACTION, and reversing the original PRIMARY and SECONDARY parameters. This establishes the B volumes as suspended primaries, activates change recording on the B volumes, and releases write inhibit on the B volumes.
5. If desired, FlashCopy® the B volume suspended primaries to C volumes to provide safe copies for interim disaster recovery protection.
6. Restart applications at the recovery site.