I was planning to migrate to Freenas 8 from 0.7 but then looked at current ZFS pool status pool: tank state: DEGRADED status: One or more devices could not be used because the label is missing or invalid. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Replace the device using 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-4J scrub scrub stopped after 0h1m with 0 errors on Thu Jan 5 11:35:29 2012 config: NAME STATE READ WRITE CKSUM tank DEGRADED 0 0 0 raidz1 DEGRADED 0 0 0 ad4 ONLINE 0 0 0 ad6 ONLINE 0 0 0 ad10 ONLINE 0 0 0 ad12 ONLINE 0 0 0 9708325104572171644 UNAVAIL 0 0 0 was /dev/ad14 ad16 ONLINE 0 0 0 errors: No known data errors All disks seem to be ONLINE according to Status|Disks. I cannot replace the drive from CLI. [sami@nassi /]$ zpool replace tank 9708325104572171644 cannot open '9708325104572171644': no such GEOM provider must be a full path or shorthand device name [sami@nassi /]$ zpool replace tank ad14 cannot use '/dev/ad14': must be a GEOM provider or regular file [sami@nassi /]$ zpool replace tank /dev/ad14 cannot use '/dev/ad14': must be a GEOM provider or regular file How to fix pool? Or would it be safe to just attach drives to FreeNAS 8 machine and do Auto-Import?