Woke up this morning to a disabled disk 3. There were a few errors that have always been there for years and have not increased, not sure what to do here. I think it failed at 9am EST while the monthly parity check was running

Do you replace it? Do you run steps to just reenable it?

Smart report and system diagnostic attached. Any help or next steps would be greatly appreciated

tower-diagnostics-20260101-1231.zip

HGST_HUS726060ALE614_K8GBPWED-20260101-1227.txt

Oh my. I just noticed the 2000+ errors. That just came out of nowhere.

how the hell are there 2000+ errors but SMART passed?

It's not logged as a disk problem and SMART looks fine, so most likely a power/connection issue.

15 hours ago, JorgeB said:

It's not logged as a disk problem and SMART looks fine, so most likely a power/connection issue.

Even with all those errors? It says over 2000 errors on the disks page

Would be great news if the disk was fine.

Everything on this build is brand spanking new as of 2 months ago, except the drives. They're used HGST

1x Parity

5x Data disks

One of the data disks randomly is down, passes smart and has 2000 errors on the disks page. I have been told that from the diagnostic results, there is no issue with the drive.

I panicked and bought a WD RED Pro the same size as my parity and was going to use it to replace the bad data disk. Let's scrap that idea, can I have my pool with one down drive and use it to add a second parity instead? Is that dumb? Is it wise? It's an 8TB drive and I do not need the extra space

tower-diagnostics-20260101-1231.ziptower-smart-20260101-1227.zip

Emulated disk3 is mounted so should be OK to rebuild after fixing connections.

I have merged your threads. Please don't start multiple topics on the same issue. It makes it impossible to coordinate responses.

You must rebuild disk3 unless you want to lose its data. And dual parity doesn't really make sense with so few disks anyway.

You can rebuild to the same disk though, and that is what we recommend since the emulated disk is mountable.

Got it. Ty.

Will report back shortly

I wanted to have the two parity drives because the data is somewhat important and do not want to risk losing it because a second drive dies. I know it's a rarity, but it is possible

1 minute ago, sanfark said:

the data is somewhat important

Good backup plan is more important than parity.

Plenty of much more common ways to lose data besides a failed disk, including user error.

If you accidentally delete something, parity will agree it was deleted.

So what you most people do to backup tons of TB? Another gosh darn Unraid server!?!?!

My most important data is backed up to external drives and stored offsite. I have several drives in rotation, and these are all smaller drives previously used in my server. My most important data will all fit on a single 2TB drive.

My less important data is backed up less frequently to another Unraid server, older hardware and drives I had after upgrading my main server. It is only powered up for backups, has less capacity than my main server, so the important data doesn't go there, and some data from my main server isn't backed up at all because it is unimportant or easily regenerated.