On Fri, 24 Feb 2012 11:56:39 -0600 (CST) Larry Owen <larryowen@xxxxxxxxxxx> wrote: > We have a raid6 array with 3 "failed" discs. However, smart > status for all drives is ok. I'm also not seeing any io errors > in my logs (except when the discs were initially dropped). I > also tried reading raw data from one of the failed drives, > using dd. I was able to get data, still no io errors. > > We're thinking about trying to re-add or assemble --force, > in hopes of getting it up to recover some data (did I mention > the users put important data on here knowing it was not backed > up). > > Our main concern is that we add the discs and the system start > rebuilding. Any suggestions on how we should proceed? Use assemble --force - this situation is exactly what it is for. mdadm -S /dev/md0 mdadm -A --force /dev/md0 You might need to list all the component devices, depending on what is in your mdadm.conf NeilBrown > > Thanks, > Larry Owen > > ################### MDADM OUTPUT ############################## > > mdadm --detail /dev/md0 > /dev/md0: > Version : 1.2 > Creation Time : Tue Feb 1 16:25:03 2011 > Raid Level : raid6 > Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB) > Raid Devices : 22 > Total Devices : 21 > Persistence : Superblock is persistent > > Update Time : Wed Feb 22 23:42:11 2012 > State : active, FAILED, Not Started > Active Devices : 19 > Working Devices : 21 > Failed Devices : 0 > Spare Devices : 2 > > Layout : left-symmetric > Chunk Size : 512K > > Name : kddm-nas:0 (local to host kddm-nas) > UUID : 9fc31e38:7723974a:1f37af62:5a75ec91 > Events : 5412 > > Number Major Minor RaidDevice State > 0 8 16 0 active sync /dev/sdb > 1 8 32 1 active sync /dev/sdc > 2 8 48 2 active sync /dev/sdd > 3 8 64 3 active sync /dev/sde > 4 8 80 4 active sync /dev/sdf > 5 8 96 5 active sync /dev/sdg > 6 8 112 6 active sync /dev/sdh > 7 0 0 7 removed > 8 8 144 8 active sync /dev/sdj > 9 8 160 9 active sync /dev/sdk > 10 8 176 10 active sync /dev/sdl > 11 0 0 11 removed > 12 8 208 12 active sync /dev/sdn > 13 8 224 13 active sync /dev/sdo > 14 8 240 14 active sync /dev/sdp > 15 0 0 15 removed > 16 65 16 16 active sync /dev/sdr > 17 65 32 17 active sync /dev/sds > 18 65 48 18 active sync /dev/sdt > 19 65 64 19 active sync /dev/sdu > 20 65 80 20 active sync /dev/sdv > 21 65 96 21 active sync /dev/sdw > > 22 65 112 - spare /dev/sdx > 23 65 128 - spare /dev/sdy > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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