I’m a fairly new user of TrueNAS and ZFS, I set up my NAS this summer. I had three disks available, and figured I would use two in a mirror setup, and add the third as a spare. My understanding was that if/when one of the disks in the mirror failed, the spare would step in and take its place and I …

Which of my understandings are wrong: How spares work, or what my box is telling me now?

DjP-iX December 16, 2025, 8:24pm 9

may be helpful?

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Pool degraded, confused about how the spare works