Back in 2013 I cobbled together a little guide within a post on the FreeNAS users forum on how to add drive to an existing ZFS volume and convert it in to a mirrored volume. I can’t at all remember even writing this little thing, but recent discussion in the old forum over it brought in to doubt whether or not the method would still work. So I spooled-up a VM with the latest FreeNAS (FreeNAS 11) and tried it out. Yup. Still works, see:

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