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Recovering from a non-controller failure

After the equipment at the disaster site has undergone any required maintenance or replacement, but no controllers were replaced, you can begin the process of returning the MetroCluster configuration to a fully redundant state. This includes healing the configuration (first the data aggregates and then the root aggregates) and performing the switchback operation.

Before you begin

  • All MetroCluster hardware in the disaster cluster must be functional.

  • The overall MetroCluster configuration must be in switchover.

  • In a fabric-attached MetroCluster configuration, the ISL must be up and operating between the MetroCluster sites.

  1. Healing the configuration in a MetroCluster FC configuration
    Following a switchover, you must perform the healing operations in specific order to restore MetroCluster functionality.
  2. Verifying that your system is ready for a switchback
    If your system is already in the switchover state, you can use the -simulate option to preview the results of a switchback operation.
  3. Performing a switchback
    After you heal the MetroCluster configuration, you can perform the MetroCluster switchback operation. The MetroCluster switchback operation returns the configuration to its normal operating state, with the sync-source storage virtual machines (SVMs) on the disaster site active and serving data from the local disk pools.
  4. Verifying a successful switchback
    After performing the switchback, you want to confirm that all aggregates and storage virtual machines (SVMs) are switched back and online.
  5. Deleting stale aggregate listings after switchback
    In some circumstances after switchback, you might notice the presence of stale aggregates. Stale aggregates are aggregates that have been removed from ONTAP, but whose information remains recorded on disk. Stale aggregates are displayed in the nodeshell aggr status -r command but not in the storage aggregate show command. You can delete these records so that they no longer appear.