Readynas NV+ v2 - RAID sync finished on volume C. The array is still in degraded mode

Question

Hello,
I've been getting increasing warnings from my ReadyNas NV+ v2 recently about disk 4 having increasing uncorrectable errors. I went ahead and purchased a replacement hard drive and replaced the bad one last night. The resync looked like it kicked off, but this morning, I got the following message: "RAID sync finished on volume C.&nbsp; The array is still in degraded mode, however.&nbsp; This can be caused by a disk sync failure or failed disks in a multi-parity disk array."
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When I came home, I saw that the screen on the ReadyNas said that volume C was in lifesupp. I logged into the console and saw disk 3 and disk 4 listed as spares. I tried to access the shares/volumes, but nothing came up. I restarted the NAS with the volume scan option checked off thinking that it was just an error that would go away. Unfortunately I think I may have made the situation worse.
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Would someone be so kind as to help me troubleshoot this?
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Disk Config as follows:
Disk 1: Seagate Barracuda Green 2 TB/ST2000DL003-9VT166Disk 2: Seagate Barracuda Green 2 TB/ST2000DL003-9VT166Disk 3: Seagate Barracuda Green 2 TB/ST2000DL003-9VT166Disk 4: Seagate Barracuda Green 4 TB/ST4000DM004-2CV104
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I see the following error in the console:
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The paths for the shares listed below could not be found.&nbsp; Typically, this occurs when the ReadyNAS is unable to access the data volume.  share media backup download
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I can provide logs to anyone who needs them.
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I'd appreciate any help that you could provide. Like an idiot, I failed to backup my NAS before I replaced the drive, and fear that I've lost the last 8 years worth of data.

StephenB · Answer

I suggest powering down the NAS and testing all 4 of the original drives in a PC using Seatools.

bolan1 · Answer

Thanks StephenB, I'll give that a shot. What exactly would this accomplish though? I thought once I pulled the bad drive out, wouldn't the NAS begin rebuilding the array and therefore possibly overwrite some data that was on the other 3 drives?

StephenB · Answer

bolan1&nbsp;wrote:
Thanks StephenB, I'll give that a shot. What exactly would this accomplish though? I thought once I pulled the bad drive out, wouldn't the NAS begin rebuilding the array and therefore possibly overwrite some data that was on the other 3 drives?

There are some cases where the array is completely rebuilt - for instance, when you insert a third disk, and the RAID is converted from RAID-1 to RAID-5.
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But your situation isn't one of those.&nbsp; Your resync was trying to reconstruct the contents of the failed disk from the remaining three.&nbsp; That process doesn't change the other three drives.&nbsp; It looks like it failed because of the second disk failure.
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I'm suggesting that you test the disks with Seatools, because it is useful to know exactly what the disk health issues are. You might also have issues on the other two disks (since the disks are generally put into the NAS together, and operate together, they often can fail in rapid sucession).&nbsp; If disks aren't 100% dead, it is often useful to clone them to working new drives.&nbsp; Sorting this out up-front helps steer the data recovery approach.
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If one of the failing drives are still (mostly) readable, you could attempt to clone it to a new drive.&nbsp; You then could boot the system with the clone.&nbsp; There would likely be some file system corruption, but there's a good chance you'd recover most (maybe all) of the files.
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Another approach here is to use RAID recovery software (for instance&nbsp;https://www.r-studio.com/ ), or to use Netgear's data recovery service (&nbsp;https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service ).&nbsp;

bolan1 · Answer

Ahh, I think I'm seeing your troubleshooting logic here. Just so I understand what happened here, please confirm my thought pattern (humor me please).
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Disk 4 reported errors, so I went and hot swapped it with a new drive.
The X-RAID rebuild kicked off, but during the process, disk 3 probably failed.
Since the rebuild process probably didn't completely finish, I now have 2 failed disks in this array, which is more than the allowed number of failed disks (1).
Therefore, the troubleshooting path is to check all 4 of the old disks with Seatools in order to confirm the status of each drive (making sure to power off the NAS, pull each drive out and label which disk is which). If I can determine that 3 of the disks are still viable (presumably disk 1, disk 2 and possibly the old disk 4), could I pop the old disk 4 into the NAS and boot it up? Would that overwrite any data, or would that give me a shot at recovering some or all of the data that resided on the array, now that I have 3 working disks in there?
If it does turn out that disk 3 and the old disk 4 are no longer viable, I could theoretically attempt to clone them, and then pop them back into the NAS. If that fails, I'm stuck with either using recovery software as you suggested, or possibly paying for data recovery.
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Does that cover the gist of it?
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Appreciate the help StephenB.

bolan1 · Answer

I performed a short generic pass test on all 4 of the original disks, and they all passed. Should I do the long generic test too? At this point, should I attempt to get new drives and clone the original ones? Would the new drives have to be same size as the original (2 TB)?

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Readynas NV+ v2 - RAID sync finished on volume C. The array is still in degraded mode

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