7.4.3 Disaster event and recovery

In the event of a disaster which makes Server 1 unavailable, the following sequence of events will occur:

  • All other DR tasks will be carried out on relevant required services. For instance, DR databases will be brought up, DR legacy systems will be failed over, and so on.
  • The running LPARs on Server 2 will be shut down in a controlled fashion.
  • The disaster recovery LPARs will be started in a controlled fashion, in the correct order.

    After the failover, Server 2 runs all production systems on their respective backup LPARs. After Server 1 is repaired, the systems can be migrated back at a convenient time with a scheduled outage.

    Figure 7-6 The two systems after disaster recovery