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I had a disk fail in a #ZFS mirror. I removed the bad disk from the pool, and then swapped in a new drive.
(For reasons, I didn't just swap the disk and use a replace command)
I then, mistakenly, used the 'add' command which made a stripe, not a mirror.
Ugh.
With solid backups in place, I threw caution to the wind and tried to 'remove' the 2nd disk.
Took a while, but ZFS moved the data to the other disk and then I was able to add (attach...) it correctly and remake the mirror.
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I've just passed my AZ-900 Azure Fundemtnals test. I've been in IT for 15+ years and have just never been a certification guy. Fun to get one, however basic it is. I've now accumulated some useless internet points!