`mdadm` comamnd is unable to assemble an existing array.
Issue
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mdadm comamnd is unable to assemble an existing array.
mdadm --assemble --scanreturns "mdadm: /dev/md0 assembled from 2 drives - not enough to start the array."Array information is as follows
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1,/dev/sdc1,/dev/sde1And
mdadm --examine /dev/sdx1returns clean and active for each disk ...[root@hostname ~]# mdadm --examine /dev/sda1 /dev/sda1: Magic : a92b4efc Version : 0.90.00 UUID : 35413b36:5583131c:0e88505a:69de3bee Creation Time : Thu Aug 18 17:18:37 2011 Raid Level : raid5 Used Dev Size : 976759936 (931.51 GiB 1000.20 GB) Array Size : 2930279808 (2794.53 GiB 3000.61 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Tue Nov 4 12:39:56 2014 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : 89364046 - correct Events : 446 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 0 8 1 0 active sync /dev/sda1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 2 2 8 33 2 active sync /dev/sdc1 3 3 8 65 3 active sync /dev/sde1 [root@hostname ~]# mdadm --examine /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 0.90.00 UUID : 35413b36:5583131c:0e88505a:69de3bee Creation Time : Thu Aug 18 17:18:37 2011 Raid Level : raid5 Used Dev Size : 976759936 (931.51 GiB 1000.20 GB) Array Size : 2930279808 (2794.53 GiB 3000.61 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Tue Nov 4 12:39:56 2014 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : 89364058 - correct Events : 446 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 1 8 17 1 active sync /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 2 2 8 33 2 active sync /dev/sdc1 3 3 8 65 3 active sync /dev/sde1 [root@hostname ~]# mdadm --examine /dev/sdc1 /dev/sdc1: Magic : a92b4efc Version : 0.90.00 UUID : 35413b36:5583131c:0e88505a:69de3bee Creation Time : Thu Aug 18 17:18:37 2011 Raid Level : raid5 Used Dev Size : 976759936 (931.51 GiB 1000.20 GB) Array Size : 2930279808 (2794.53 GiB 3000.61 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Thu Oct 23 15:10:57 2014 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : 892683a7 - correct Events : 434 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 2 8 33 2 active sync /dev/sdc1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 2 2 8 33 2 active sync /dev/sdc1 3 3 8 65 3 active sync /dev/sde1 [root@hostname ~]# mdadm --examine /dev/sde1 /dev/sde1: Magic : a92b4efc Version : 0.90.00 UUID : 35413b36:5583131c:0e88505a:69de3bee Creation Time : Thu Aug 18 17:18:37 2011 Raid Level : raid5 Used Dev Size : 976759936 (931.51 GiB 1000.20 GB) Array Size : 2930279808 (2794.53 GiB 3000.61 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Thu Oct 23 15:10:57 2014 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : 892683c9 - correct Events : 434 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 3 8 65 3 active sync /dev/sde1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 2 2 8 33 2 active sync /dev/sdc1 3 3 8 65 3 active sync /dev/sde1
Environment
- Red Hat Enterprise Linux 5
- md RAID
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