NAS540: Volume down, repairing failed, how to restore data?

ksr7 · November 2019

Here it is, sir :

~ # e2fsck -n /dev/md2

e2fsck 1.42.12 (29-Aug-2014)

Warning! /dev/md2 is in use.

ext2fs_open2: Bad magic number in super-block

e2fsck: Superblock invalid, trying backup blocks...

e2fsck: Bad magic number in super-block while trying to open /dev/md2

The superblock could not be read or does not describe a valid ext2/ext3/ext4

filesystem. If the device is valid and it really contains an ext2/ext3/ext4

filesystem (and not swap or ufs or something else), then the superblock

is corrupt, and you might try running e2fsck with an alternate superblock:

e2fsck -b 8193 <device>

or

e2fsck -b 32768 <device>

ksr7 · November 2019

Good news!

I finally have my data back!

I tried to recover the superblock index with e2fsck using backups listed, but none of them worked

So I decided to come back to the old plan and try again logical devs combinations.

The procedure I followed is this one : 1) Deactivating the volume with vgchange -an 2) Stop md2 3) Create array with new combination

And when I arrived at C / B / D / A and rebooted, NAS is finally gives my data back.

I'm really happy now, thanks to everyone involved.

Good Luck and all the best!

antonymarc · December 2019

Thanks ksr7. Your response helped me.

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