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Tutor

Jul 24, 2015

Data Volume Lost after Disk Replace #25483643

Hello ReadyNAS Community, after a disk failure (disk 3), I replaced this disk. A volume resynchronization was started automatically. However, this resynchronisation failed with no obvious error...

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azerva

Tutor

Jul 29, 2015

Hi guys,

update on the whole situation. Netgear Support recommended cloning the disk with ddrescue. I did this, the process finished with 4 errors. Below is the log file.

# Command line: ddrescue -fv /dev/sdb /dev/sda ddrescue.log
# current_pos  current_status
0x14419EC7C00     +
#      pos        size  status
0x00000000  0x139A33C4000  +
0x139A33C4000  0x00001000  -
0x139A33C5000  0x00004000  +
0x139A33C9000  0x00001000  -
0x139A33CA000  0xA76AF6000  +
0x14419EC0000  0x00001000  -
0x14419EC1000  0x00005000  +
0x14419EC6000  0x00002000  -
0x14419EC8000  0x8DA724E000  +

If I am reading this correctly, there are 4 relatively small areas (designated by the - at the end which are bad). I tried to start ReadyNAS with disks 1, 2 and the cloned disk 4, however this didn't work.

Are there any additional steps I need to consider? Should I consider re-running ddrescue using the -r option for more retries? Or is there a command to try to re-detect the RAID volume?

Thanks for any hints.

Alex