Hi all, Unfortunately my raid10 array (2TB x 4 disks, total 4TB) stopped working and mdadm command reports State "removed" and "faulty removed" disks are there. Could someone advise me how to recover the raid10 array? I read this page and jumped into here. https://raid.wiki.kernel.org/index.php/RAID_Recovery Your help is appreciated, Yuji raid10 created as: # mdadm --create --verbose --assume-clean /dev/md0 --level=10 --raid-devices=4 --chunk=1024 --layout=n2 /dev/sd[bcde] /dev/md0 is formatted by xfs. *** when working well: *** # cat /proc/mdstat Personalities : [raid10] md0 : active raid10 sdb[0] sde[3] sdd[2] sdc[1] 3907028992 blocks 1024K chunks 2 near-copies [4/4] [UUUU] unused devices: <none> **** now broken: **** # cat /proc/mdstat Personalities : [raid10] md0 : inactive sdd[2] sde[3] 3907028992 blocks unused devices: <none> # mdadm --examine /dev/sd[bcde] /dev/sdb: Magic : a92b4efc Version : 0.90.00 UUID : 5911f80e:dfc48edd:c6cdfb15:1768b409 Creation Time : Mon May 7 17:00:11 2012 Raid Level : raid10 Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Array Size : 3907028992 (3726.03 GiB 4000.80 GB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 0 Update Time : Wed Oct 23 10:56:11 2013 State : clean Active Devices : 3 Working Devices : 3 Failed Devices : 1 Spare Devices : 0 Checksum : d6c88478 - correct Events : 34220 Layout : near=2 Chunk Size : 1024K Number Major Minor RaidDevice State this 0 8 16 0 active sync /dev/sdb 0 0 8 16 0 active sync /dev/sdb 1 1 0 0 1 faulty removed 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde /dev/sdc: Magic : a92b4efc Version : 0.90.00 UUID : 5911f80e:dfc48edd:c6cdfb15:1768b409 Creation Time : Mon May 7 17:00:11 2012 Raid Level : raid10 Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Array Size : 3907028992 (3726.03 GiB 4000.80 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Mon Jun 3 09:32:45 2013 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : d60c30db - correct Events : 8 Layout : near=2 Chunk Size : 1024K Number Major Minor RaidDevice State this 1 8 32 1 active sync /dev/sdc 0 0 8 16 0 active sync /dev/sdb 1 1 8 32 1 active sync /dev/sdc 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde /dev/sdd: Magic : a92b4efc Version : 0.90.00 UUID : 5911f80e:dfc48edd:c6cdfb15:1768b409 Creation Time : Mon May 7 17:00:11 2012 Raid Level : raid10 Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Array Size : 3907028992 (3726.03 GiB 4000.80 GB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 0 Update Time : Wed Oct 23 18:25:25 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 1 Spare Devices : 0 Checksum : d6c8edf7 - correct Events : 34224 Layout : near=2 Chunk Size : 1024K Number Major Minor RaidDevice State this 2 8 48 2 active sync /dev/sdd 0 0 0 0 0 removed 1 1 0 0 1 faulty removed 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde /dev/sde: Magic : a92b4efc Version : 0.90.00 UUID : 5911f80e:dfc48edd:c6cdfb15:1768b409 Creation Time : Mon May 7 17:00:11 2012 Raid Level : raid10 Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Array Size : 3907028992 (3726.03 GiB 4000.80 GB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 0 Update Time : Wed Oct 23 18:25:25 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 1 Spare Devices : 0 Checksum : d6c8ee09 - correct Events : 34224 Layout : near=2 Chunk Size : 1024K Number Major Minor RaidDevice State this 3 8 64 3 active sync /dev/sde 0 0 0 0 0 removed 1 1 0 0 1 faulty removed 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde # mdadm --examine /dev/sd[b-z] | egrep 'Event|/dev/sd' /dev/sdb: Events : 34220 this 0 8 16 0 active sync /dev/sdb 0 0 8 16 0 active sync /dev/sdb 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde /dev/sdc: Events : 8 this 1 8 32 1 active sync /dev/sdc 0 0 8 16 0 active sync /dev/sdb 1 1 8 32 1 active sync /dev/sdc 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde /dev/sdd: Events : 34224 this 2 8 48 2 active sync /dev/sdd 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde /dev/sde: Events : 34224 this 3 8 64 3 active sync /dev/sde 2 2 8 48 2 active sync /dev/sdd 3 3 8 64 3 active sync /dev/sde ----- CONFIDENTIAL: This e-mail may contain information that is confidential or otherwise protected from disclosure and intended only for the party to whom it is addressed. If you are not the intended recipient, please notify the sender by return and delete this e-mail. You are hereby formally advised that any unauthorized use, disclosure or copying of this email is strictly prohibited and may be unlawful. -- 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
