Replaced and initialised HDD. RAID no longer intact

[boerie]

Oh dear…

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 Setup task fscheck.sh is now running
Found disk: sdb(ZFN0QXQM)
Found disk: sdc(ZFN0SR45)
Found disk: sdd(ZW62NQ4S)
Found disk: sde(ZFN0SQ5J)
Check file system on md0(please wait, take a long time... ca 1 hour/TB)
=>e2fsck 1.43.4 (31-Jan-2017)
ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap
/usr/sbin/e2fsck: Group descriptors look bad... trying backup blocks... Resize inode not valid. Recreate? yes
Pass 1: Checking inodes, blocks, and sizes
Inode 34824 has an invalid extent node (blk 487620607, lblk 0)
Clear? yes
Killed
Fail (could not check the file system)

[Jocko]

I am sorry that seems not good for your data :dry

We go to try to use some backup superblock
First step will be to get the list of these superblock.

I assume the nas is still on setup mode, open a shell window and do

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 dumpe2fs /dev/md0|grep superblock

wait because you have a big partition size

[boerie]

Oh dear…

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 root@LacieNAS:/ # dumpe2fs /dev/md0|grep superbloc
k
dumpe2fs 1.43.4 (31-Jan-2017)
Killed
root@LacieNAS:/ #

[Jocko]

:crazy

But I know the first backup superblock is the block 32768.

So try this command

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e2fsck -vy -b 32768 -B 4096 /dev/md0

[boerie]

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 root@LacieNAS:/ # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdb8[0] sde8[3] sdd8[4] sdc8[1]
      11712345600 blocks super 1.0 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
     
unused devices: <none>
root@LacieNAS:/ # e2fsck -vy -b 32768 -B 4096 /dev
/md0
e2fsck 1.43.4 (31-Jan-2017)
LacieNASShare was not cleanly unmounted, check forced.
Resize inode not valid.  Recreate? yes

Pass 1: Checking inodes, blocks, and sizes
Inode 34824 has an invalid extent node (blk 487620607, lblk 0)
Clear? yes

Killed
root@LacieNAS:/ #