Corrupt superblock or partition table
Posted: 15 Jan 2016, 14:45
Hello,
I have some problems with the partitions on my NAS (QNAP 431) and I wonder whether Testdisk might be able to solve it.
What happened?
I migrated from an RAID 1 setup to an RAID 5 setup (not via shell but via an NAS inbuilt GUI). On a first glance everything seems to be ok.
However, I am not longer able to mount the volume.
I did some googling and a helpful person from the qnap forums (thread is in german) suggested that the RAID is active but most probably has a broken filesystem due to errors during the resize.
Several posts refer to TestDisk, but I did not find the find the courage to try it out (since there is some precious data on my RAID). Hence, before trying I thought I'd ask the experts whether TestDisk might be suitable for this problem.
I'd appreciate any help and suggestions you might have. Thanks a lot.
I have some problems with the partitions on my NAS (QNAP 431) and I wonder whether Testdisk might be able to solve it.
What happened?
I migrated from an RAID 1 setup to an RAID 5 setup (not via shell but via an NAS inbuilt GUI). On a first glance everything seems to be ok.
Code: Select all
mdadm --detail /dev/md1
Version : 1.0
Creation Time : Thu Dec 31 01:56:55 2015
Raid Level : raid5
Array Size : 5840623232 (5570.05 GiB 5980.80 GB)
Used Dev Size : 2920311616 (2785.03 GiB 2990.40 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Tue Jan 5 19:23:37 2016
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : 1
UUID : 553fe61b:9f23ed34:d2d6c2d4:9b2a59cf
Events : 10759
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
2 8 19 1 active sync /dev/sdb3
3 8 35 2 active sync /dev/sdc3
Code: Select all
[/] # mdadm -A /dev/md1 /dev/sd[a-c]3
mdadm: /dev/sda3 is busy - skipping
mdadm: /dev/sdb3 is busy - skipping
mdadm: /dev/sdc3 is busy - skipping
Code: Select all
[/] # e2fsck -v -f /dev/mapper/cachedev1
e2fsck 1.42.6 (21-Sep-2012)
The filesystem size (according to the superblock) is 986873856 blocks
The physical size of the device is 724834304 blocks
Either the superblock or the partition table is likely to be corrupt!
I'd appreciate any help and suggestions you might have. Thanks a lot.