NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
RN212 volume degraded after reboot after replacing disk
Set-up: Raid1 (X-RAID), 2 x WD Nas Red 2TB disks On 20 August the volume status changed to degraded. Only 1 disk visible anymore. Due to circumstances the disk was only replaced on 12 October. A...
BBSUP wrote:
Chances are slim that this new disk dead already.
Disks can fail at any time. Historically disk reliability has followed a "bathtub curve", with new disks and very old disks being the most likely to fail. Generally I test my disks before installing them in a Windows PC with vendor tools - running the full non-destructive test, followed by the full write test. I have sometimes had new disks fail those tests. If the disk passes, you might try the write test (since the disk needs to be resynced anyway if it is good).
What disk model did you purchase? The WD20EFAX is SMR, and I don't recommend it for ReadyNAS. If you got that, I suggest exchanging it for a WD20EFRX.
BBSUP wrote:
What log can be checked to see if the issue is with the enclosure instead of the disk? Anything that can be done remotely about this? Or should a replacement enclosure be requested? Device still under warranty.
You can download the log zip file. Disk-info.log might give you some info, though generally "dead" disks aren't listed there. You can also look for i/o errors in system.log and kernel.log.
It's possible you'll see some errors that point to the disk itself - it is unlikely that you'll see anything that points to the enclosure. A failing SATA interface in the chassis can't be distinguished from a failing SATA interface in the disk itself.
What you could do is power down the NAS, and remove the new disk (best the label it). Then move the older disk into the other bay, and see if the system boots. If it does, it's not the enclosure.
What disk model did you purchase? The WD20EFAX is SMR, and I don't recommend it for ReadyNAS. If you got that, I suggest exchanging it for a WD20EFRX.
The original disk was WD20EFRX, the replacement is indeed WD20EFAX. Our vendor doesn't offer WD20EFRX anymore, so to get CMR, we'd need WD2002FFSX then (WD Red Pro). But performance isn't really an issue on that particular device, it just stores an acronis backup which is then uploaded to the Cloud.
What you could do is power down the NAS, and remove the new disk (best the label it). Then move the older disk into the other bay, and see if the system boots. If it does, it's not the enclosure.
In worst case, yes. The NAS isn't located here and due to Covid-19 onsite visits are limited.
BBSUP wrote:
What disk model did you purchase? The WD20EFAX is SMR, and I don't recommend it for ReadyNAS. If you got that, I suggest exchanging it for a WD20EFRX.
The original disk was WD20EFRX, the replacement is indeed WD20EFAX. Our vendor doesn't offer WD20EFRX anymore, so to get CMR, we'd need WD2002FFSX then (WD Red Pro). But performance isn't really an issue on that particular device, it just stores an acronis backup which is then uploaded to the Cloud.
Personally, I won't use SMR in a RAID array, and don't know what WD was thinking when they silently switched to SMR drives a while back. Write speeds are highly variable, and can slow down to a crawl. This potentially can lead to timeouts (which could cause a drive to drop out of the array).
WD changed their lineup (in response to customer backlash), and put only SMR disks into the WD Red line. CMR disks are now in the WD Red Plus lineup (and of course the WD Red Pro). The WD20EFRX is still current, and is in the Red Plus line.
You might want to push back on your supplier - WD no longer positions the WD20EFAX as a replacement for the EFRX. I get that performance isn't a primary concern but several folks here have had issues with the 2-6 TB EFAX drives.
An alternative to the Red Pro is the 2 TB Seagate Ironwolf - you can mix that with the existing Red.
Personally, I won't use SMR in a RAID array, and don't know what WD was thinking when they silently switched to SMR drives a while back. Write speeds are highly variable, and can slow down to a crawl. This potentially can lead to timeouts (which could cause a drive to drop out of the array).
I wasn't aware of these implications. Thanks for this additional information :smileyhappy:
BBSUP wrote:
Personally, I won't use SMR in a RAID array, and don't know what WD was thinking when they silently switched to SMR drives a while back. Write speeds are highly variable, and can slow down to a crawl. This potentially can lead to timeouts (which could cause a drive to drop out of the array).
I wasn't aware of these implications. Thanks for this additional information :smileyhappy:
There is some good information here - https://www.servethehome.com/wd-red-smr-vs-cmr-tested-avoid-red-smr/ Though it is not specific to ReadyNAS or the BTRFS file system. In their tests, the arrays didn't actually fail, but they did see really long raid sync times (I think it was 9 days for the WD40EFAX).
WD (as you might expect), insists the drives are ok for their recommended workloads. But they definitely back-pedaled in separating the SMR drives into their own line, and by coming clean and disclosing SMR/CMR on their data sheets. I think still have a lawsuit on their hands.
Other vendors have done the same thing (including Seagate) - but not with their NAS-purposed drives. So part of the lesson here is that shucked USB drives and desktop drives could well be SMR, so you need to be careful if you go that route.
FWIW, I use a lot of WD Red (plus) CMR drives in my own NAS, and I do plan to continue using them. I've found them to be quite reliable. Though customers with the Ironwolf drives also seem to like them. I have a couple of 1 TB Ironwolf, which have been reliable (though too small for my current NAS volumes).
NETGEAR Academy
Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology!
Join Us!
