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.
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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
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[/] # 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
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[/] # 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.