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ReadyNAS 104 lost X-RAID volume after degraded disk replacement
Hi all, my RN104 (6.2.4) reported a failed disk (#3 of 4 3TB disks) with the data degraded msg. I removed the disk and connected to my Win10 PC to check. Disk Management recognized the disk. I deleted and recreated a volume and I ran a disk scan. No issues were found.
Perhaps I should have simply replaced the disk with a new one but I deleted the volume and re-inserted the disk back into the NAS. The NAS began re-syncing. Was still syncing when I went to bed and in the morning, I got the Degraded msg again....this time disk 1 was blinking and now I have lost my X-RAID volumes. Unfortunately I do not have a backup.
I've read some other cases like this in the community with various suggestions. My log shows that at the exact same time, the sync completed but another disk failed.
I am curious what my overal path to recovery looks like (if any). I'm open to Prosupport (only option Netgear offers for RN104 is Prosupport for Home) or 3rd party recovery SW.
Thanks in advance for any insight or help.
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vtech92 wrote:
...this time disk 1 was blinking and now I have lost my X-RAID volumes. Unfortunately I do not have a backup.
My log shows that at the exact same time, the sync completed but another disk failed.
The second disk failure is what caused you to lose the volume. X-RAID/RAID-5 has single redundancy, so it can't repair two failed disks. This failure likely would have happened if you'd inserted a new disk also. The RAID resync requires reading every sector of the original disks (which allows it to recover the data on the new blank disk).
Unfortunately, you just learned the hard way that RAID is not enough to keep your data safe.
vtech92 wrote:
I am curious what my overall path to recovery looks like (if any). I'm open to Prosupport (only option Netgear offers for RN104 is Prosupport for Home) or 3rd party recovery SW.
Recovery from multiple disk failures is problematic, and you made it more difficult by reformatting disk 3.
One thing you could attempt is to clone disk 1 with a software package that supports sector-by-sector cloning. Then reboot the NAS in read-only mode with the clone installed (instead of disk 1), and with disks 2 and 4. Leave disk 3 out, as you don't want the NAS to resync. Note I don't recommend cloning to the original disk 3 - you want to clone to disk you are sure is healthy. If that works, then immediately back up your data.
Netgear does have a recovery service - they charge by the hour, and offer no guarantee of success. This is not covered by normal support contracts - more details are here: https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service
There are some software recovery packages that support btrfs. One that several folks have used with success is ReclaiMe. https://www.reclaime.com/ You'd need a way to connect all four drives to the PC though. USB adapter/docks can be used for this.
Thanks for the quick response Stephen.
A couple of questions to help me form my strategy:
- Was the resync of #3 not completed?
- Can I basically use disk 3 as a "fresh" disk and use to clone of #1? Or buy another WD30EFRX CMR. They're not readily avilable but I think I can find one still
So to clarify the sequence of recovery:
- Attempt to clone disk #1, if that does not work,
- Consider Reclaime for recovery. I can connect all to my PC MB via sata ports
It sounds like buying a ProSupport contract is not going to do much more for me. Is that true?
Thanks again
vtech92 wrote:
A couple of questions to help me form my strategy:
- Was the resync of #3 not completed?
Hard to say from your log. One more thing you could try is to power down, remove disk 1, and then reboot (read-only from the boot menu), and see if that works. Again, if it does you need to back up as much as you can w/o delay - since disk 3 is suspect.
vtech92 wrote:- Can I basically use disk 3 as a "fresh" disk and use to clone of #1?
I don't recommend that, as it might still be useful in recovery as it is.
vtech92 wrote:It sounds like buying a ProSupport contract is not going to do much more for me.
It doesn't cover data recovery, so I don't think it will help.
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