Hello,
yesterday i add a disk on my raid 5 but during the rebuild ... a disk fail...
so my raid is down with 2 disk of 5 connected but not recognized 
setup : OMV 0.3
4 * 1To Seagate
1*1To Samsung (the new disk)
how can recover my raid ?
Thanks for your help, and excuse my poor english.
Raid 5 is lost with two disks missing. Sorry but you most likely lost everything.
I misunderstood. I thought two failed at the same time.
You need to: mdadm --remove /dev/md127 /dev/sd#
to remove the dead disk
What does your cat /proc/mdstat look like now?
root@openmediavault:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md127 : active (read-only) raid5 sdf[0] sdb[5](S) sdc[3] sdd[2] sdg[1]
2930284032 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/4] [UUUU_]
unused devices: <none>
root@openmediavault:~# mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Sat Jun 2 07:59:38 2012
Raid Level : raid5
Array Size : 2930284032 (2794.54 GiB 3000.61 GB)
Used Dev Size : 976761344 (931.51 GiB 1000.20 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Fri Nov 2 19:48:04 2012
State : clean, degraded
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Delta Devices : 1, (4->5)
Name : openmediavault:RAID (local to host openmediavault)
UUID : 04c071c4:310aad7a:a9c332e4:c9e7b1d3
Events : 33138
Number Major Minor RaidDevice State
0 8 80 0 active sync /dev/sdf
1 8 96 1 active sync /dev/sdg
2 8 48 2 active sync /dev/sdd
3 8 32 3 active sync /dev/sdc
4 0 0 4 removed
5 8 16 - spare /dev/sdb
in fact /dev/sdd is dead .. if i mount the partition.. faultly ...
but i don't understand why the sapre disk don't be active 
That helps a lot.
Do this:
mdadm --fail /dev/md127 /dev/sdd
mdadm --remove /dev/md127 /dev/sdd
mdadm --grow /dev/md127 --raid-devices=4
The first two steps remove the dead drive. The last step makes the spare an active drive.
mdadm: set /dev/sdd faulty in /dev/md127
root@openmediavault:~# mdadm --remove /dev/md127 /dev/sdd
mdadm: hot remove failed for /dev/sdd: Device or resource busy
root@openmediavault:~# mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Sat Jun 2 07:59:38 2012
Raid Level : raid5
Array Size : 2930284032 (2794.54 GiB 3000.61 GB)
Used Dev Size : 976761344 (931.51 GiB 1000.20 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Fri Nov 2 20:06:51 2012
State : clean, FAILED, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Reshape Status : 48% complete
Delta Devices : 1, (4->5)
Name : openmediavault:RAID (local to host openmediavault)
UUID : 04c071c4:310aad7a:a9c332e4:c9e7b1d3
Events : 33146
Number Major Minor RaidDevice State
0 8 80 0 active sync /dev/sdf
1 8 96 1 active sync /dev/sdg
2 8 48 2 faulty spare rebuilding /dev/sdd
3 8 32 3 active sync /dev/sdc
4 0 0 4 removed
5 8 16 - spare /dev/sdb
root@openmediavault:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md127 : active raid5 sdf[0] sdb[5](S) sdc[3] sdd[2](F) sdg[1]
2930284032 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/3] [UU_U_]
[=========>...........] reshape = 48.6% (475260640/976761344) finish=8011.5min speed=1042K/sec
unused devices: <none>
Is the drive mounted? If so, umount it. It not, try booting a livecd (like systemrescuecd) to run these commands.
Actually it looks like it is rebuilding although slowly. Maybe you can't remove the faulty drive until it is done.
yes but... i've allready tried this and speed down to ...10Kbs.. time estimated : 300 000 minuts...
actually :
root@openmediavault:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md127 : active raid5 sdf[0] sdb[5](S) sdc[3] sdd[2](F) sdg[1]
2930284032 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/3] [UU_U_]
[=========>...........] reshape = 48.6% (475260640/976761344) finish=85045.9min speed=98K/sec
unused devices: <none>
The disk have dead cluster ... block at 48.6%
echo 50000 > /proc/sys/dev/raid/speed_limit_min
might speed it up if the limit isn't already set there.
Did you try unplugging the dead drive?
OMV lists the serial numbers. Most drives have the serial numbers on them. So, you should be able to find it that way.
yes i know 
i'm cooking right now ..
remove drive after
Cooking the drive will not help
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