Hello,
after hours and hours of googling and trying out things, I gave up on
this. This email is my last hope of getting my data back.
I have 4*4TB drives installed and want to create a raid 5 with them.
So what I did is create an array of 3 disks (raid 5), copy the data from
the 4th drive (I don't have more space available) to the raid and then I
wanted to add the last drive to the raid.
I made a mistake here. I accidentally grew the raid to 4 disks with
sudo mdadm --grow --raid-devices=4 /dev/md0 --backup-file=/tmp/md0.bak
BEFORE adding the last drive as a hot spare. Mdadm immediately started a
reshape and says that it failed - because it consists of 4 drives but
only 3 drives are available.
I thought okay, let him complete the reshape and everything will be
okay. But no - the reshape is stuck at 34.3%.
What I have tried:
- Reboot ( about a 100 times)
- increase stripe cache size up to 32768
mdadm --assemble --invalid-backup --backup-file=/root/mdadm0.bak
/dev/md0 /dev/sdc1 /dev/sde1 /dev/sdf1
And some other things.
The raid is not mountable. When I try to mount it, the mount command
just hungs and nothing happens. That means that I had to edit my fstab
with a rescue cd because it would never boot again.
That also means that I have no access to my data.
When I shutdown or reboot the computer, it also hungs at shutdown, I can
only hard reset it.
cat /proc/mdstat:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [r$
md0 : active raid5 sdc1[0] sdf1[3] sde1[1]
7813771264 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3]
[UU__]
[======>..............] reshape = 34.3% (1340465664/3906885632)
finish=3$
bitmap: 3/30 pages [12KB], 65536KB chunk
unused devices: <none>
mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri Dec 1 02:10:06 2017
Raid Level : raid5
Array Size : 7813771264 (7451.79 GiB 8001.30 GB)
Used Dev Size : 3906885632 (3725.90 GiB 4000.65 GB)
Raid Devices : 4
Total Devices : 3
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sun Dec 3 13:34:43 2017
State : active, FAILED, reshaping
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Reshape Status : 34% complete
Delta Devices : 1, (3->4)
Name : nas-server:0 (local to host nas-server)
UUID : e410e68d:76460b65:69c056c0:d2645d55
Events : 28155
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1
1 8 65 1 active sync /dev/sde1
3 8 81 2 spare rebuilding /dev/sdf1
6 0 0 6 removed
Any help is appreciated, I'm lost.
Kind Regards
René
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