Understanding the PowerHA SystemMirror cluster verification process

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By default, verification runs automatically without any configuration required.

Verification occurs on both active and inactive clusters. In order for automatic verification to work, more than one node must exist in the cluster, since PowerHA® SystemMirror® compares the configuration of one node against the configuration of another node.

Verification ensures an error-free cluster startup and poses a negligible impact on performance, which is directly related to the number of nodes, volume groups, and file systems in the cluster configuration.

The phases of the verification and synchronization process are as follows:

  1. Verification
  2. Snapshot (optional)
  3. Synchronization.

For details on these phases, see Understanding the detailed phases of verification. After verification, cluster services start.