Hilfe mein Raid wird nicht mehr erkannt ;-(

crank · 21. Februar 2013

Code

root@storage02:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdg[1] sdf[6](S) sdh[2]
      5860540680 blocks super 1.2


md126 : active raid1 sdd[2] sdc[0]
      1953513424 blocks super 1.2 [2/2] [UU]


unused devices: <none>
root@storage02:~#

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crank · 21. Februar 2013

i found this site
http://zackreed.me/articles/50…e-disk-failure-with-mdadm

Zitat

If all else fails, you can zero the superblocks, and then re-create the array. mdadm is smart enough to detect the existing data, and shouldn't overwrite it.

is it true ?
if its true i can easily zero all superblocks and create a new array. but what about my data and the filesystem ? if i had only a naked array after this there will be easier ways to make it :shock:

ryecoaaron · 21. Februar 2013

I don't know if it is true or not. It makes me very nervous though. I'm not sure what else to try because it will not let you add the drives from one array to the other without zeroing the superblock.

crank · 21. Februar 2013

but there is no other array.
all drives where in the array before the power cable on the backplane was broken. and the state of the drives was clear before.
the first array md0 is the right array for my 6 hhd´s 5x2TB Raid5 and 1x2TB Hotspair
the other array you see is the raid 1 array.

ryecoaaron · 21. Februar 2013

Didn't notice the raid 1 label. Are you able to add the drives to the array using mdadm --add /dev/md0 /dev/sdX

crank · 21. Februar 2013

Code

root@storage02:~# mdadm --add /dev/md0 /dev/sdb
mdadm: cannot get array info for /dev/md0

ryecoaaron · 21. Februar 2013

How about mdadm --create /dev/md0 --assume-clean --level=5 --raid-devices=5 /dev/sd[uvwxyz]

crank · 21. Februar 2013

Code

root@storage02:~# mdadm --create /dev/md0 --assume-clean --level=5 --raid-devices=5 /dev/sd[ghbei]
mdadm: partition table exists on /dev/sdb but will be lost or
       meaningless after creating array
mdadm: /dev/sde appears to be part of a raid array:
    level=raid5 devices=5 ctime=Mon Feb  4 22:39:00 2013
mdadm: super1.x cannot open /dev/sdg: Device or resource busy
mdadm: /dev/sdg is not suitable for this array.
mdadm: super1.x cannot open /dev/sdh: Device or resource busy
mdadm: /dev/sdh is not suitable for this array.
mdadm: /dev/sdi appears to be part of a raid array:
    level=raid5 devices=5 ctime=Mon Feb  4 22:39:00 2013
mdadm: partition table exists on /dev/sdi but will be lost or
       meaningless after creating array
mdadm: create aborted
root@storage02:~#

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i only added 5 drives in the command g,h,b,e,i
the 6. one is shown as spare in cat /proc/mdstat sdf [s]
but if its correct that the drive is really the spare ?!

Code

root@storage02:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdg[1] sdf[6](S) sdh[2]
      5860540680 blocks super 1.2


md126 : active raid1 sdd[2] sdc[0]
      1953513424 blocks super 1.2 [2/2] [UU]


unused devices: <none>

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ryecoaaron · 22. Februar 2013

I'm out of ideas unless you are willing to try zeroing the superblocks I just worry about losing the data.

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