RAID5 missing volume data recovery

yimbot · 05-20-2011, 10:20 AM

Hi,

I am looking for some help with a NAS storage data recovery.
I have a WD Sharespace 4TB NAS which had a failed Hard drive shortly after purchase. I have sent the failed drive to be replaced under warranty, and replaced the drive with a new one while I wait.
The problem I have is that 65% of the way through a rebuild, I think I must have had a power failure or something because it failed and I am back to only three working disks.

So I have the 3x SATA 1TB disks connected to a machine running Ubuntu Live CD.
I can see the drives when performing fdisk -l and get the following results:

Code:

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1          26      208844+  fd  Linux raid autodetect
/dev/sda2              27         156     1044225   fd  Linux raid autodetect
/dev/sda3             157         176      160650   fd  Linux raid autodetect
/dev/sda4             177      121601   975346312+  fd  Linux raid autodetect

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1          26      208844+  fd  Linux raid autodetect
/dev/sdb2              27         156     1044225   fd  Linux raid autodetect
/dev/sdb3             157         176      160650   fd  Linux raid autodetect
/dev/sdb4             177      121601   975346312+  fd  Linux raid autodetect

Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1          26      208844+  fd  Linux raid autodetect
/dev/sdc2              27         156     1044225   fd  Linux raid autodetect
/dev/sdc3             157         176      160650   fd  Linux raid autodetect
/dev/sdc4             177      121601   975346312+  fd  Linux raid autodetect

Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
1 heads, 63 sectors/track, 31008336 cylinders
Units = cylinders of 63 * 512 = 32256 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00577d66

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1   *           2    31008256   976760032+   7  HPFS/NTFS

So all seems ok there. If I look at the Disk utility, it tells me that the RAID Array does not have enough components to start.

Would someone please point me in the right direction to mount the remaining three drives as an array that I can copy the files from them or even restore the RAID to a working state. From what I can gather, the files should be intact...

Thanks!

yimbot · 05-20-2011, 06:10 PM

Any ideas what I can try?

yimbot · 05-21-2011, 08:55 PM

lithos · 05-24-2011, 02:52 PM

Hi,

sorry, but you have the 4th drive inserted NTFS/windows formatted drive into Linux RAID array

Quote:

Device Boot Start End Blocks Id System
/dev/sdd1 * 2 31008256 976760032+ 7 HPFS/NTFS

which then is making trouble and if you have access to NAS setup you probably want to enable Rebuild on this drive (although WD FAQ tells it's going to happen automatically)
My recommendation would be to erase the drive partitions completely and try it again