> Hello,
>
> I was wondering if anyone had come across an issue where after rebooting the
> system, mdadm is failing to reassemble the entire raid 5 array with all the
> drives. I am getting the array up with just /dev/sda and /dev/sdb, but the
> array is degraded as a consequence to missing /dev/sdd (which I assume has
> become the parity drive). Below is some information that I believe will help
> display my situation. Your help is greatly appreciated, TIA :)
>
> mdadm -V
> mdadm - v3.1.4 - 31st August 2010
> (Debian Version: Version: 3.1.4-1+8efb9d1)
>
>
> uname -a
> Linux XEN-HOST 2.6.32.26-xen-amd64 #1 SMP Thu Dec 2 00:20:03 EST 2010 x86_64
> GNU/Linux
>
>
> mdadm --detail /dev/md0
> /dev/md0:
> Version : 1.2
> Creation Time : Mon Dec 20 09:48:07 2010
> Raid Level : raid5
> Array Size : 1953517568 (1863.02 GiB 2000.40 GB)
> Used Dev Size : 976758784 (931.51 GiB 1000.20 GB)
> Raid Devices : 3
> Total Devices : 2
> Persistence : Superblock is persistent
>
> Update Time : Fri Feb 18 12:27:09 2011
> State : clean, degraded
> Active Devices : 2
> Working Devices : 2
> Failed Devices : 0
> Spare Devices : 0
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Name : XEN-HOST:0 (local to host XEN-HOST)
> UUID : 7d8a7c68:95a230d0:0a8f6e74:4c8f81e9
> Events : 32122
>
> Number Major Minor RaidDevice State
> 0 8 1 0 active sync /dev/sda1
> 1 8 17 1 active sync /dev/sdb1
> 2 0 0 2 removed
> <-------- Missing drive
>
>
>
> fdisk -luc /dev/sda
>
> Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
> 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x411fb12e
>
> Device Boot Start End Blocks Id System
> /dev/sda1 63 1953520064 976760001 fd Linux raid autodetect
>
>
>
> fdisk -luc /dev/sdb
>
> Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
> 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x02f65de3
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 63 1953520064 976760001 fd Linux raid autodetect
>
>
>
> fdisk -luc /dev/sdd
>
> Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
> 81 heads, 63 sectors/track, 382818 cylinders, total 1953525168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x8b0c29c7
>
> Device Boot Start End Blocks Id System
> /dev/sdd1 2048 1953525167 976761560 fd Linux raid autodetect
>
>
>
>
> cat /etc/mdadm/mdadm.conf
> # mdadm.conf
> #
> # Please refer to mdadm.conf(5) for information about this file.
> #
>
> # by default, scan all partitions (/proc/partitions) for MD superblocks.
> # alternatively, specify devices to scan, using wildcards if desired.
> DEVICE partitions
>
> # auto-create devices with Debian standard permissions
> CREATE owner=root group=disk mode=0660 auto=yes
>
> # automatically tag new arrays as belonging to the local system
> HOMEHOST
>
> # instruct the monitoring daemon where to send mail alerts
> MAILADDR root
>
> # definitions of existing MD arrays
> ARRAY /dev/md/0 metadata=1.2 UUID=7d8a7c68:95a230d0:0a8f6e74:4c8f81e9
> name=XEN-HOST:0
>
>
Forgot to add this this:
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sda1[0] sdb1[1]
1953517568 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
unused devices: <none>
Then after:
mdadm --add /dev/md0 /dev/sdd1
mdadm: re-added /dev/sdd1
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sda1[0] sdb1[1]
1953517568 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
[>....................] recovery = 0.0% (121732/976758784)
finish=534.8min speed=30433K/sec
Thanks.
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