You can remove a plex from a mirrored aggregate. You might do this if you want to stop mirroring the aggregate, or if there is a problem with the plex. Removing a plex results in an unmirrored aggregate.
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In case of a failure that causes a plex to fail, you can remove the plex from the mirrored aggregate, fix the problem, and then re-create it. You can also re-create it using a different set of disks or array LUNs, if the problem cannot be fixed.