I noticed a disk failure just now on one of the drives in my main pool - heard the clicking sound of repeated access attempts so I looked at what 'zpool status' said: pool: export state: DEGRADED status: One or more devices are faulted in response to persistent errors. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Replace the faulted device, or use 'zpool clear' to mark the device repaired. scan: scrub repaired 0 in 8h12m with 0 errors on Sat Aug 31 10:09:50 2013 config: NAME STATE READ WRITE CKSUM export DEGRADED 0 0 0 raidz1-0 DEGRADED 0 0 0 ata-WDC_WD10EACS-00ZJB0_WD-WCASJ2114122 ONLINE 0 0 0 ata-WDC_WD10EACS-00ZJB0_WD-WCASJ2195141 ONLINE 0 0 0 ata-WDC_WD10EARS-00Y5B1_WD-WMAV50817803 FAULTED 1 2 0 too many errors ata-ST31000528AS_9VP18CCV ONLINE 0 0 0 logs mirror-1 ONLINE 0 0 0 ata-OCZ-VECTOR_OCZ-0974C023I4P2G1B8-part7 ONLINE 0 0 0 ata-OCZ-VECTOR_OCZ-8RL5XW08536INH7R-part7 ONLINE 0 0 0 cache ata-OCZ-VECTOR_OCZ-0974C023I4P2G1B8-part6 ONLINE 0 0 0 ata-OCZ-VECTOR_OCZ-8RL5XW08536INH7R-part6 ONLINE 0 0 0 errors: No known data errors the fix is easy, insert replacement disk and run: # zpool replace -f export ata-WDC_WD10EARS-00Y5B1_WD-WMAV50817803 ata-WDC_WD10EARS-00Y5B1_WD-WMAV50933036 # zpool status -v export pool: export state: DEGRADED status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Wed Sep 4 10:13:09 2013 109G scanned out of 2.78T at 75.9M/s, 10h15m to go 27.3G resilvered, 3.84% done config: NAME STATE READ WRITE CKSUM export DEGRADED 0 0 0 raidz1-0 DEGRADED 0 0 0 ata-WDC_WD10EACS-00ZJB0_WD-WCASJ2114122 ONLINE 0 0 0 ata-WDC_WD10EACS-00ZJB0_WD-WCASJ2195141 ONLINE 0 0 0 replacing-2 FAULTED 0 0 0 ata-WDC_WD10EARS-00Y5B1_WD-WMAV50817803 FAULTED 1 2 0 too many errors ata-WDC_WD10EARS-00Y5B1_WD-WMAV50933036 ONLINE 0 0 0 (resilvering) ata-ST31000528AS_9VP18CCV ONLINE 0 0 0 logs mirror-1 ONLINE 0 0 0 ata-OCZ-VECTOR_OCZ-0974C023I4P2G1B8-part7 ONLINE 0 0 0 ata-OCZ-VECTOR_OCZ-8RL5XW08536INH7R-part7 ONLINE 0 0 0 cache ata-OCZ-VECTOR_OCZ-0974C023I4P2G1B8-part6 ONLINE 0 0 0 ata-OCZ-VECTOR_OCZ-8RL5XW08536INH7R-part6 ONLINE 0 0 0 errors: No known data errors craig -- craig sanders <cas@taz.net.au>