I have a Linux gateway with 2 500gb drives in software RAID 1 for system.
/dev/sda = RAID 1 /dev/sdb = RAID 1 /dev/sdc = RAID 5 (NAS 12 drives iSCSI, /home directories)
While replacing sdb, weird thing happened, NAS mounted as /dev/sdb at reboot, so RAID recovery procedure happily recovered RAID 1 system drive on the NAS, overwriting some data and partition table. The process was interrupded by me, when I saw what is happening.
Now I have end up with 1 broken partiton of 500gb on the 20TB NAS.
Of course I have some users that do not have backups, some 4TB data of high importance is lost somewhere on the NAS, other things can be dumped.
I believe that the data is still there, only partitions are lost.
I have tried testdisk, after 4 days of analysis, I only get this "new" broken partitions:
Disk /dev/sdc - 20 TB / 18 TiB - CHS 2431671 255 63 Partition Start End Size in sectors D Linux 0 1 1 59999 254 63 963899937 [root] D Linux RAID 0 1 1 59999 254 63 963899937 [md0]
I can even read some of the “new” data that I don't want. No sign of real data.
Any ideas what can be done?