Hi folks. I logged into my freeNAS server today via the web interface and I was greeted with this message:
“Device: /dev/ada0, 16 Currently unreadable (pending) sectors”
It seems like that one of my hard drives (ada0) needs to be replaced. The question I have is, how do I determine which physical drive in my server is the malfunctioning one? I have 10 WD Red 6TB drives (RAID Z2) in there and I would like to find out if there is an easy way to determine which one is the faulty drive.
I’m not using Hot swapable bays. It’s a regular ATX case. That gives me an idea though. I disabled the drive, gonna wait a few minutes for it to cool down. My hand should be able to tell which drive is cooler to the touch.
Yeah, thanks guys, I found the drive and made sure to write down the name, number, and location of every drive in case something similar happens in the future. Turns out I had HGST drives. 10 x 6TB. it’s been 4 years since I built this NAS and my last NAS had WD Reds and I forgot these were HGSTs. Anyways, Warranty is out of the question. Standard is 3 years and this drive was bought 4 years ago.
Just a point of principle, that error message doesnt mean the drive is dead yet, just that it has some duff sectors. 16 is not enough to pull the disk and a scrub should deal with it, bit keep an eye on the drive. True it is a sign that it is on its way out, but you can live with it for a while if you have RAIDZ2 and hotspare.
You can migrate any “prevail” disks down to a lower priority array like the CCTV or secondary backup and keep them going a bit longer.
For future reference the error message for device unreadable Is that the pool will say “Degraded” and tell you which drive is out of action. Guidance here:
+1. This is no longer in the active maintenance train. Backup and upgrade to 11.3. it is stable.
Yes, it is a SMART error and not a ZFS error. I know that this drive might be fine for years to come and I’m not gonna throw it away. I’ll just use it as a tertiary backup. I won’t take the chance of it screwing with my zpool and that’s why I’m replacing it. It could die tomorrow or last another 20 years, but why risk it.
Even stranger. I mean; shit happens, but this is way too low…
Might be a Model that was not ported to the new DB when WD faded out the brand. Still: Try it. Heard some good things about their handling of stuff like that. Maybe you at least get a discount. Worth a mail, don’t you think?