Hi everybody,
I have a slight problem here with my RAID 1+0 setup.
One of the discs just failed and I'm unable to figure
out why (for example) mdadm is unable to start the
particular RAID1 (/dev/md4-submirror, failed disc is /dev/sdd).
The setup is this:
------- /etc/raidtab -----------------------------------
##
## Data-Disk - Part 1
##
raiddev /dev/md3
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
persistent-superblock 1
## device /dev/hdk2
device /dev/hde2
raid-disk 0
## device /dev/hdm2
device /dev/hdg2
raid-disk 1
## failed-disk 1
##
## Data-Disk - Part 2
##
raiddev /dev/md4
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
persistent-superblock 1
## device /dev/hdi2
device /dev/sdd2
raid-disk 0
## failed-disk 1
## device /dev/hdg2
device /dev/sdc2
raid-disk 1
## failed-disk 1
##
## Data-Disk - Raid 1+0
##
raiddev /dev/md5
raid-level 0
nr-raid-disks 2
nr-spare-disks 0
persistent-superblock 1
chunk-size 32
device /dev/md3
raid-disk 0
device /dev/md4
raid-disk 1
--------------------------------------------------------------
mdadm --detail /dev/md3
/dev/md3:
Version : 00.90.00
Creation Time : Mon Sep 16 23:33:02 2002
Raid Level : raid1
Array Size : 58616640 (55.90 GiB 60.02 GB)
Device Size : 58616640 (55.90 GiB 60.02 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent
Update Time : Fri Sep 26 08:06:35 2003
State : dirty, no-errors
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Number Major Minor RaidDevice State
0 0 0 0 faulty removed /dev/swap
1 33 2 1 active sync /dev/hde2
2 34 2 2 spare /dev/hdg2
UUID : fb702fa9:a4c55dcf:87cccecb:31f1e9ba
Events : 0.465
mdadm --examine /dev/sdc2
/dev/sdc2:
Magic : a92b4efc
Version : 00.90.00
UUID : d5c2d1f7:cf7cb245:2d9e7057:097ec133
Creation Time : Mon Sep 16 22:05:35 2002
Raid Level : raid1
Device Size : 60034880 (57.25 GiB 61.48 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 4
Update Time : Thu Mar 13 05:03:45 2003
State : dirty, no-errors
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Checksum : 512475a - correct
Events : 0.423
Number Major Minor RaidDevice State
this 2 8 50 2 spare /dev/sdd2
0 0 0 0 0 faulty removed /dev/swap
1 1 8 34 1 active sync /dev/sdc2
2 2 8 50 2 spare /dev/sdd2
-------------------------------------------------------
>mdadm -v -R /dev/md4
mdadm: failed to run array /dev/md4: No such device
The problem occurred while resynccing the /dev/md4 RAID1-mirror
and of course the "master" device was the faulty one.
The question now is, is someone capable of describing how to get
this /dev/md4-mirror started so that I can continue copying data
out of RAID1+0 (dev/md5) mirror ?
Regards,
Tomi Orava
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