On Sat, 6 Mar 2010, Richard Elling wrote:

On Mar 6, 2010, at 5:38 PM, tomwaters wrote:

My though is this, I remove the 3rd mirror disk and offsite it as a backup.

To do this either:
        1. upgrade to a later version where the "zpool split" command is 
available
        2. zfs send/receive to the disk to be stored offsite

Note that zpool split does not support a re-join. Once the split is split, it's split for good. To use it as an off-site backup, it'd be better to do a zpool offline instead, and then pull the disk.
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