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ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement

tojnk
Aspirant

ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement

Model: ReadyNAS NV+ [X-RAID]
Firmware: RAIDiator 4.1.14 [1.00a043]

 

X-RAID with 4 2TB disks. WD Green, as shown in screenshot.

 

Unit of my brother-in-law. I said I would try to look into it to see if it could be repaired.

 

Disk 3 has failed after a power outage. I just found out this disk has been giving SMART errors for over a year, but the errors had gone unnoticed. Disk 3 was replaced. And after a long resync the volume is now offline and 2 disks show 0 MB free space and the 2 other disks show 1860 GB free space.

 

What can I try to do here? With 1 disk failed, the volume should still be intact, so what could have gone wrong here?

 

I will try to make a clone of the failed drive using ddrescue, as desribed here. But hopefully one of you can give a hint in how to restore the volume.

Model: ReadyNAS-NV+|ReadyNAS NV+
Message 1 of 6
StephenB
Guru

Re: ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement

I suggest testing the remaining disks with lifeguard in a Windows PC next.

Message 2 of 6
tojnk
Aspirant

Re: ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement

I ran a quick check on disks 1, 2 and 4. And they all look ok.

 

SMART

smart disk1.pngsmart disk2.pngsmart disk4.png

 

Lifeguard

wd lifeguard disk 1.pngwd lifeguard disk 2.pngwd lifeguard disk 4.png

What could have caused the volume to go offline?

Message 3 of 6
StephenB
Guru

Re: ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement


@tojnk wrote:

I ran a quick check on disks 1, 2 and 4. And they all look ok.

 ...

What could have caused the volume to go offline?


 

I agree the disks look ok. 

 

It is possible that the power failure resulted in lost writes - that can damage the file system even when the disks are good.

 

If he has no backup, you probably will need to look into RAID recovery. R-Studio looks fairly inexpensive (the version you'd need would cost about $79, and you can see if it can recover anything before you purchase).  But you would need to connect the three good drives to a PC.

Message 4 of 6
tojnk
Aspirant

Re: ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement

I looked into R-Studio, but was unable to get the virtual raid working. I was unsure about a number of parameters. I read the NV+ uses RAID4, but what are the block size and offset?

 

In the mean time I used ddrescue to make a clone of disk 3. 

When I attached disks 1, 2 and the cloned 3 to the NAS the volume (disk 4 removed) the volume came online!

Message 5 of 6
StephenB
Guru

Re: ReadyNAS NV+ RND4000 v3 volume offline after failed drive replacement


@tojnk wrote:

 

In the mean time I used ddrescue to make a clone of disk 3. 

When I attached disks 1, 2 and the cloned 3 to the NAS the volume (disk 4 removed) the volume came online!


Great.  There could be file system corruption (since there likely were some sectors that didn't copy to the clone).

 

I suggest making a backup next. 

Message 6 of 6
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