Volume Degraded without errors

Question

Hello!&nbsp;I have a ReadyNas 104 with 2&nbsp;WDC WD40EFRX-68WT0N0 4TB NAS HDs.&nbsp;Out of the blue, the system started to show the 2nd HD as DEGRADED.&nbsp;I have destroyed, reseted the hole system and formatted both HDs. If I leave just the first one running it seems to be ok. If I plug the second one, it says that the volume is degraded, and if I run a test it shows that disc failed in the test, but without saying WHY it failed.&nbsp;&nbsp;There is any kind of error or warnings other than "volume degraded". If I plug the HD in another CPU, I can format and use the HD without any warnings or errors.&nbsp;&nbsp;No matter what I do, the system show that this volume is degraded.&nbsp;Any suggestions on what to do?

StephenB · Answer

mvlaran&nbsp;wrote:
&nbsp;
Any suggestions on what to do?

Replace the disk.
&nbsp;
Getting another WD40EFRX is fine, you could also get a 4 TB Seagate Ironwolf.&nbsp; Avoid the WD40EFAX, as it is SMR.
&nbsp;
mvlaran&nbsp;wrote:
&nbsp;If I plug the HD in another CPU, I can format and use the HD without any warnings or errors.&nbsp;
&nbsp;

Not a definitive test.&nbsp; You could try testing it with WD's dashboard software.&nbsp; But it's pretty clear that the NAS is not happy with the disk.

mvlaran · Answer

That's what I'm thinking, replacing the disc! I've already disconnected it.

Is it possible to downgrade the RAID 1 to JBOD so the unit stop flashing "DEGRADED" all over while I can't afford a new disc? (I'm brazillian, it's very expensive to buy a new HD now... I will have to wait a few months until I can get a new one.

StephenB · Answer

mvlaran&nbsp;wrote:
Is it possible to downgrade the RAID 1 to JBOD so the unit stop flashing "DEGRADED" all over while I can't afford a new disc?&nbsp;

If you are using the web ui, that would require destroying the volume and creating a new one.&nbsp; You'd need to reinstall any apps, recreate the shares, backup jobs, and similar stuff.&nbsp; And restore all the data from a backup.
&nbsp;
There is a way to do it with the linux command line (ssh), but I don't recommend going that route unless you already are comfortable with linux.&nbsp; Also, it's best to make sure you have an up-to-date backup if you go that route.
&nbsp;
FWIW, you should make sure you have your important data backed up anyway, as it is quite possible that disk 1 will fail while you are waiting.

mvlaran · Answer

I'm quite comfortable with linux / unix. If you have a how-to, I would like to try.&nbsp;&nbsp;I have another backup solution besides nas, so my data is not (so much) uncovered!&nbsp;

StephenB · Answer

mvlaran&nbsp;wrote:
I'm quite comfortable with linux / unix. If you have a how-to, I would like to try.&nbsp;
&nbsp;

Enable ssh (if not enabled already).&nbsp; Then log in as root, using the the NAS admin password.
&nbsp;
The process of removing the failed drive from the array is actually pretty simple (it's much more complicated if you are removing a drive from RAID-5 or other more complicated modes).&nbsp; It's described in the second post here:

https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Reducing-RAID-size-removing-drives-WITHOUT-DATA-LOSS-is-possible/td-p/1736125

&nbsp;
If you vertically expanded the volume in the past, you will have multiple RAID groups (not just md127).&nbsp; If that's the case, you'd need to repead his process for the other RAID groups in the volume.&nbsp; You might also need to do it for the OS partition (md0).

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Volume Degraded without errors

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