During my weekly scrub I got this e-mail from my server.
Good to know that my data is safe and has been healed
pool: tank state: ONLINE status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-9P scrub: scrub completed after 1h55m with 0 errors on Fri Dec 3 03:55:15 2010 config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ada2 ONLINE 0 0 0 ada1 ONLINE 0 0 1 32K repaired ada3 ONLINE 0 0 0 ada0 ONLINE 0 0 0 ada4 ONLINE 0 0 0 errors: No known data errors