High-availability considerations

If the target devices, which are cached, are part of a resource group that is managed in a high-availability cluster, the failover operation must be planned properly.

Caching can be activated only on one node at a time. Before any failover event is initiated, you must ensure that the caching operation is disabled on the original system. After the failover to an alternative system is completed, you must manually enable the caching software.

To enable the caching software, complete the following steps:

  1. Stop the caching on the original system.
    # cache_mgt cache stop -t hdisk2
  2. Start the caching on the new system after the failure recovery is completed.
    # cache_mgt cache start -t hdisk2