Hello,
I have a RAID-5 with 3 devices. One disked failed and I added a new one. During sync a second disc failed. This second "Disc" is a RAID-0 consisting of to 120GB IDE Discs. I handled to dump an image of both disc with ddrescue. Only a few kilobytes of the broken disk could not been read (some where in the middle of the disc).
For my recovering experiments I made an Image of the remaining disc of the RAID-5 (/dev/loop3). No I tried to assemble the both RAIDs using loopbackdevice. The RAID-0 (/dev/md0) started without any problems. But the RAID-5 is not starting. It seems like both discs are marked as spare (see below).
========= (Image of the working device of the RAID-5)========
livecd ~ # mdadm --examine /dev/loop3
/dev/loop3:
Magic : a92b4efc
Version : 00.90.00
UUID : b3081913:cee36385:187ba9cf:56150f19
Creation Time : Mon May 7 08:37:48 2007
Raid Level : raid5
Used Dev Size : 237866112 (226.85 GiB 243.57 GB)
Array Size : 475732224 (453.69 GiB 487.15 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 6
Update Time : Sat Nov 1 02:26:45 2008
State : clean
Active Devices : 1
Working Devices : 2
Failed Devices : 2
Spare Devices : 1
Checksum : 37352dcc - correct
Events : 0.670720
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 33 0 active sync /dev/sdc1
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 9 0 3 spare /dev/md0
==================================
===The RAID consisting of 2 IDE Device Images====
livecd ~ # mdadm --examine /dev/md0
/dev/md0:
Magic : a92b4efc
Version : 00.90.00
UUID : b3081913:cee36385:187ba9cf:56150f19
Creation Time : Mon May 7 08:37:48 2007
Raid Level : raid5
Used Dev Size : 237866112 (226.85 GiB 243.57 GB)
Array Size : 475732224 (453.69 GiB 487.15 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 6
Update Time : Sat Nov 1 01:44:09 2008
State : clean
Active Devices : 2
Working Devices : 3
Failed Devices : 1
Spare Devices : 1
Checksum : 3735239e - correct
Events : 0.670714
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 9 1 2 active sync /dev/md1
0 0 8 33 0 active sync /dev/sdc1
1 1 0 0 1 faulty removed
2 2 9 1 2 active sync /dev/md1
3 3 9 0 3 spare /dev/md0
================================
livecd ~ # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : inactive loop3[0](S) md0[2](S)
482062016 blocks
md0 : active raid0 loop2[0] loop1[1]
237866176 blocks 64k chunks
unused devices: <none>
====================================
livecd ~ # mdadm --detail /dev/md1
mdadm: md device /dev/md1 does not appear to be active.
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