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Unfortunately I'm not able to access the data on my NAS anymore. I can't figure out why this is the case as I haven't changed anything. So I plugged one of the harddisks in my computer to access the data. What I did:

kpartx -a /dev/sdc

Now I should be able to access 

/dev/mapper/vg001-lv001

When trying to mount it I get:

sudo mount -t xfs /dev/mapper/vg001-lv001 /home/user/mnt
mount: /dev/mapper/vg001-lv001: can't read superblock

Now I did a

parted -l

which gave me

Modell: Linux device-mapper (linear) (dm)
Festplatte  /dev/mapper/vg001-lv001:  498GB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: loop

Number  Begin   End    Size  Filesystem  Flags
 1      0,00B   498GB  498GB  xfs

Does anybody have a solution how to recover the data?

Chris
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1 Answers1

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I got the solution:

Making a copy of the partition

sudo ddrescue -b512 /dev/mapper/vg001-lv001 /somewhere/backup.iso ~/logfile.txt

After doing a

xfs_check /somewhere/backup.iso

it said that the journal is broken so

xfs_repair -L /somewhere/backup.iso

did the job! It is now possible to mount the filesystem again by

mount -o loop /somewhere/backup.iso /mnt/disk
Chris
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