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Forum Discussion
nwwoods
Jul 15, 2017Aspirant
ReadyNAS NV+ data recovery one bad disk
ReadyNAS NV+ v1, frontview 4.1.16, 4 1TB Samsung spinpoint drives, X-RAID (3 data drives, 1 parity AFAIK) It all started with noticing vast swaths of files/directories seemed to no longer be pres...
nwwoods
Jul 16, 2017Aspirant
Thanks for responding.
With disk 1 inserted, RAIDar showed the disk healthy, but I got connection refused from Frontview or browsing. The only way I could rouse Frontview was with only disks 3,4 inserted.
I was able to boot with 3,4 and add 1,2 and Frontview showed them, but resync was grayed. I used the debugger to enable it and start a resync, but the resync failed. Not surprising.
I did go farther back in the logs and noted an alert about disk 1 from way back in April. Combined with the recent fail on disk 2, 2 failed disks from ReadyNAS' point of view, so no wonder.
The drives are all readable as I mentioned before, with ext2-explorer. I bought R-Studio and can read each of the drives with it also. I bought a pair of 2TB drives and did a factory reset so I basically have a fresh ReadyNAS. Am working through the original disks one by one on a PC with R-Studio and recovering. backup share from Disk 1 in progress now. It says 8 days to finish. Recovered contents so far are good. Guess I could have gone the Ubuntu route per http://home.bott.ca/webserver/?p=306 and saved 80 bucks bu R-Studio looks real nice and reminds me of Norton Utilities from the old days.
At least the drives seem to be independent so I can recover them one at a time. I thought X-RAID with 4 disks was RAID-5 like, but so far I don't see any striping, thankfully. It's just going to take a long time.
StephenB
Jul 17, 2017Guru - Experienced User
There is striping with XRAID (which on an NV+ is using RAID4 - dedicated parity disk)
- nwwoodsJul 17, 2017Aspirant
Thank you StephenB. Fascinating.
How does the block level striping work at the file level? Assuming 1MB blocks for SAMBA, I would expect a 3MB file to be split across 3 disks in a 4-disk system. But what I am seeing is mp3's and jpegs in that size range are fully on the one disk. Just restored a 3GB mpeg also from the same disk.
- StephenBJul 18, 2017Guru - Experienced User
nwwoods wrote:
How does the block level striping work at the file level?
RAID always works below the file system level (creating a virtual disk partition of block storage).
I believe the stripe size for your NAS is 32K. So I am confused on how you are recovering using just one disk.
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