What happens during healing (MetroCluster FC configurations)
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.
Data aggregate healing
After the problem at the disaster site is resolved, you start the storage healing phase:
Checks that all nodes are up and running at the surviving site.
Changes ownership of all the pool 0 disks at the disaster site, including root aggregates.
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.
Root aggregate healing
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.