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RN102 email warnings not matching system health in web app
I have started getting the following error warnings by e-mail from my RN102. I get several per day:
Detected high uncorrectable error count: [2720] on disk 1 (Internal) [ST4000DM000-1F2168, S301P7C1]. This condition often indicates an impending failure. Be prepared to replace this disk to maintain data redundancy.
Detected increasing pending sector: count [2720] on disk 1 (Internal) [ST4000DM000-1F2168, S301P7C1] 23 times in the past 30 days. This condition often indicates an impending failure. Be prepared to replace this disk to maintain data redundancy.
So it looks like disk 1 is an unhappy bunny which is fair enough, except when I go into the web app admin page (v6.10.8) the system status shows as "healthy" on the system overview page, both drives have a green dot on the performance page, and there is nothing at all in the logs saying there is a problem.
My RN102 is used purely as a backup to my main NAS and both are configured as RAID1 so a can afford to wait until I get a real disk failure before buying a replacement if that's what it takes to confirm there is a real fault. In the meantime is there a chance that these e-mail warnings could be false alarms?
Digsy wrote:
I have started getting the following error warnings by e-mail from my RN102. I get several per day:
Detected high uncorrectable error count: [2720] on disk 1
... wait until I get a real disk failure
These aren't false alarms. Not sure what you think a "real disk failure" is, but 2720 uncorrectable errors certainly counts as that.
The disk does need to be replaced now - I recommend going with a Seagate Ironwolf instead of a Barracuda. Currently shipping 4 TB Barracudas are SMR drives, and SMR techology doesn't work well with ReadyNAS (or RAID generally).
A WD Red Plus would also be a good replacement option (but not the WD Red - which unfortunately is also SMR).
Ignore Netgear's HCL, as it hasn't been updated in a long time.
3 Replies
Digsy wrote:
I have started getting the following error warnings by e-mail from my RN102. I get several per day:
Detected high uncorrectable error count: [2720] on disk 1
... wait until I get a real disk failure
These aren't false alarms. Not sure what you think a "real disk failure" is, but 2720 uncorrectable errors certainly counts as that.
The disk does need to be replaced now - I recommend going with a Seagate Ironwolf instead of a Barracuda. Currently shipping 4 TB Barracudas are SMR drives, and SMR techology doesn't work well with ReadyNAS (or RAID generally).
A WD Red Plus would also be a good replacement option (but not the WD Red - which unfortunately is also SMR).
Ignore Netgear's HCL, as it hasn't been updated in a long time.
Thanks for the fast reply. 🙂
By "real disk failure I meant the disk actually going down. Like I said this is essentially a backup of a backup so the chance of me losing any data permanently here is really low (hence I was willing to wait on a reply for a few days if necessary). But since I have my answer, I will get a replacement on order now.
Any idea why the admin pages in the web app show absolutely nothing about this impending drive failure though? That's the bit I find strange.
Digsy wrote:By "real disk failure I meant the disk actually going down.
It has already failed - ~3000 pending sectors means that the NAS tried to read 3000 sectors of the disk, and couldn't. And that matches the uncorrectable errors.
If you were to run Seatools on it (in a Windows PC) it would certainly not pass.
Your system is still working ok due to RAID redundancy. Leaving the disk in the system is actually hurting your performance, as the system generally is trying to read the first disk, and then failing over to the second.
Digsy wrote:
Any idea why the admin pages in the web app show absolutely nothing about this impending drive failure though?
Unfortunately it doesn't give good information about this. Several folks haven't realized that their disks were failing as a result. I complained some years ago, but Netgear never changed anything.
You could try running the disk test from the volume settings wheel, and see what happens.
FWIW, I do recommend running the various maintenance functions on a schedule. I rotate through them once a month (running each test 3x a year). Both scrub and the disk test access every sector of the drives, so I space the schedule so those run every other month.
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