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Forum Discussion
Disk Test Failure
I got a Disk Test Failure mail from my NAS (RN104, firmware 6.4.2): Disk test failed on disk in channel 2, model WDC_WD20EARX-00PASB0, serial WD-WMAZAYYYYXXX I'd like to know how severe my p...
chuckster_l wrote:
For me it is clear that I need to replace that disk, but I wanted to understand how serious the failure was so I can assess the time frame for my actions.
Does the web ui say the volume is degraded? Is the disk flagged as failed on the volume page?
chuckster_l wrote:
If I hadn't scheduled the disk test, or scheduled at greater intervals, would my data be at risk of total loss?
The NAS is running a short SMART test daily, and any read/write request would likely have failed. So my guess is that you would have been notified even w/o the scheduled maintenance.
However, one reason to use the scheduled maintenance is to get timely notifications is something is wrong. So its good you ran it.
As far as "data at risk of total loss" goes, that ship has sailed. Your data is definitely at risk.
The web interface seems just fine to me. Below are the screenshots. And the notification I got was just from the scheduled test.
So maybe the failure is not too relevant for the NAS at the moment or it's own routine diagnostics is not picking it up.
One other poster is seeing a similar report: https://community.netgear.com/t5/Using-your-ReadyNAS/RN516-can-no-longer-save-to-or-access-iSCSI/m-p/1168392/highlight/true#M119350
That makes me also wonder if it's a false report. If it were my system, I'd test the disk off-line in a PC just to be sure.
Yes Stephen, I'm freeing up an external HD for backup prior to removing the problematic disk and run a test on my desktop. When I complete this task I'll let you know the results.
Cheers.
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Regards,You are on the ball Stephen :)
I ran the off-line test (Western Digital LifeGard Diagnostics) in my desktop on the problematic disk and it passed everything. See screenshots below:
So my understanding is that is was a false report and my hard disk is fine (if anybody has a different opinion, please let me know). My question now is, how should I take the ReadyNAS disk test reports in the future. My current feeling is that I should wait for the SMART report to have some evidence of performance degration past the threshod value (or close to it), to conclude that the disk is close to failure and to replace it imediately.
I'd like to know the opinion of the wise guys for the result that I got. :)
chuckster_l wrote:
So my understanding is that is was a false report and my hard disk is fine (if anybody has a different opinion, please let me know).
Looks like it. I suggest doing the destructive write-zeros test. The "quick" one will unformat the disk, which will result in the NAS adding it back to the array/resyncing.
The full test will also give you some added confirmation that the drive is healthy (I have seen some drives pass the non-destructive test, but fail the write test).
chuckster_l wrote:
My question now is, how should I take the ReadyNAS disk test reports in the future. ...I'd like to know the opinion of the wise guys for the result that I got. :)
Me too :smileysurprised:
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