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I'm new to this raid via software. I just need to do fsck manually to /dev/md0
because it encountered an I/O error. After doing fsck, I need to
discover which hard drive cause the error. Since the affected partition is
raid1 (/dev/md0), I need to know which one of them is the I need to replace
to. I tried to check via mdadm. See below:
[r...@core home]# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Sun Jul 17 21:00:18 2005
Raid Level : raid1
Array Size : 195358336 (186.31 GiB 200.05 GB)
Device Size : 195358336 (186.31 GiB 200.05 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Tue Mar 10 18:19:00 2009
State : dirty, no-errors
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Number Major Minor RaidDevice State
0 33 1 0 active sync /dev/hde1
1 0 0 -1 removed
UUID : f613b3d3:fd0e6a89:623827b0:40f4ed2e
Events : 0.84876630
When I do fdisk -l, here is the result:
[r...@core home]# fdisk -l
Disk /dev/hde: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hde1 * 1 24321 195358401 fd Linux raid autodetect
Disk /dev/hdg: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdg1 * 1 24321 195358401 fd Linux raid autodetect
Disk /dev/hda: 80.0 GB, 80026361856 bytes
16 heads, 63 sectors/track, 155061 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 1 20317 10239736+ 83 Linux
/dev/hda2 20318 40634 10239768 83 Linux
/dev/hda3 40635 44795 2097144 82 Linux swap
/dev/hda4 44796 155061 55574064 f W95 Ext'd (LBA)
/dev/hda5 44796 155061 55574032+ 83 Linux
However, when I do mdadm /dev/md0 --fail /dev/hdg1, it says "mdadm: set device
faulty failed for /dev/hdg1: No such device".
I believe I need to replace the sata disk but I do not know which one of them.
Also, I have a feeling that the software raid1 is now properly set
though I'm new to this software raid thing.
Could anyone give an insight? My suspect is that /dev/hdg1 was not replicating
the /dev/hde1 but I cannot mount it since the system is Linux raid
autodetect.
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