During healing in MetroCluster FC configurations, the resynchronization of mirrored aggregates occurs in a phased process that prepares the nodes at the repaired disaster site for switchback. It is a planned event, thereby giving you full control of each step to minimize downtime. Healing is a two-step process that occurs on the storage and controller components.
After the problem at the disaster site is resolved, you start the storage healing phase:
During this phase of healing, the RAID subsystem resynchronizes mirrored aggregates, and the WAFL subsystem replays the nvsave files of mirrored aggregates that had a failed pool 1 plex at the time of switchover.
If some source storage components failed, the command reports the errors at applicable levels: Storage, Sanown, or RAID.
If no errors are reported, the aggregates are successfully resynchronized. This process can sometimes take hours to complete.
After the aggregates are synchronized, you start the controller healing phase by giving back the CFO aggregates and root aggregates to their respective DR partners.