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Appendix: Mirrored and unmirrored aggregates

You can use an optional feature called SyncMirror to synchronously mirror aggregate data in copies, or plexes, stored in different RAID groups. Plexes ensure against data loss if more disks fail than the RAID type protects against, or if there is a loss of connectivity to RAID group disks.

  • How unmirrored aggregates work
    Unless you are using SyncMirror, all of your aggregates are unmirrored. Unmirrored aggregates have only one plex (copy of their data), which contains all of the RAID groups belonging to that aggregate.
  • How mirrored aggregates work
    Mirrored aggregates have two plexes (copies of their data), which use the SyncMirror functionality to duplicate the data to provide redundancy.