Hello, im looking for some help.

I just noticed a movie on plex wasnt working and i checked the server to find that Disk 2 is disabled. I tried rebooting the server but still same issue.

can someone check out the diagnostic file and let me know how i should proceed.

Edit: i believe this happen after my UPS battery back up was unplugged for maybe 10 seconds. Not sure if its relevant.

Thank you,

drewbyserver-diagnostics-20250924-1453.zip

Edited September 25, 2025Sep 25 by Drewbyhans

Disk was already disabled at boot, so we can't see what happened. Next time, grab diags before rebooting.

SMART looks OK, so most likely a power/connection issue. Recommend replacing the cables then to rule those out, and assuming the emulated disk is still mounting and the contents look correct, you can rebuild on top:

• unassign the disk

• start array

• stop array

• reassign the disk

• start array

18 minutes ago, JorgeB said:

Disk was already disabled at boot, so we can't see what happened. Next time, grab diags before rebooting.

SMART looks OK, so most likely a power/connection issue. Recommend replacing the cables then to rule those out, and assuming the emulated disk is still mounting and the contents look correct, you can rebuild on top:

• unassign the disk

• start array

• stop array

• reassign the disk

• start array

Got it. I realized that i should have got the diags before i rebooted too late.

Sorry for the stupid question but what does rebuild on top mean? every where i looked online about the same issue, the articles that were linked before are now 404.

Thank you for your help!

36 minutes ago, Drewbyhans said:

but what does rebuild on top mean?

It means rebuild back to the disabled disk to get everything back in sync on the basis that the disk is physically OK and it was an external factor that got it disabled in the first lace.

On 9/24/2025 at 11:51 PM, JorgeB said:

Disk was already disabled at boot, so we can't see what happened. Next time, grab diags before rebooting.

SMART looks OK, so most likely a power/connection issue. Recommend replacing the cables then to rule those out, and assuming the emulated disk is still mounting and the contents look correct, you can rebuild on top:

• unassign the disk

• start array

• stop array

• reassign the disk

• start array

Ok so i followed these steps and got " Alert [DREWBYSERVER] - Disk 2 in error state (disk dsbl)" and paused the read-check. Here is my diags. i will proceed to unpause the read check and see if it continues. let me know if that is the wrong thing to do lol

drewbyserver-diagnostics-20250926-0123.zip

Edited September 26, 2025Sep 26 by Drewbyhans

Errors are not logged as a dis problem, did you

On 9/25/2025 at 7:51 AM, JorgeB said:

Recommend replacing the cables then to rule those out

On 9/26/2025 at 2:25 AM, JorgeB said:

Errors are not logged as a dis problem, did you

So i replaced the cable. When i followed the steps, first thing it says is "" which looked promising but then it immediately paused. When i clicked unpause, it then showed the previous error" " and now no longer says data rebuild but just
read-check in progress". last time it did a read-check, i ended up in the same spot i did before. Attached are the diags. Please let me know what would be the next step.

i appreciate the help

drewbyserver-diagnostics-20250928-1104.zip

If you have replaced both cables and the same disk still fails, replace the disk with a new one and try again rebuilding.

@JorgeB I have another cable that i replaced it with, just to rule it out, and ran into a new issue.

After following the same instructions for unmounting and remounting the drive, i ran into this: .

Do you mind guiding me to the next step? I was reading that it may be a corrupt file system?

I attached the diags.

Thank you,

Post new diags please

drewbyserver-diagnostics-20251001-2143.zipSorry i forgot to attach XD

Edited October 2, 2025Oct 2 by Drewbyhans

Diags show errors with disks 1 and 2, check/replace their cables, especially if sharing a power splitter, and post new diags after array start.

Ok so i checked my cables. Honestly i just flipped around the Sata power cables so instead of 1,2,3 its now 3,2,1 if that makes sense. My psu is not modular and honestly dont know if it has good dedicated 12v rails or whatever. Been doing some research and i think i will end up replacing the PSU anyways.

I've got potential good news.

It now shows Data-Rebuild in progress which i haven't had yet. However, it also says the unmountable disk present.

I also failed to mention im running a: 9211-8i 6Gbps HBA LSI FW:P20 IT Mode . I dont know if you were able to determine this from the diags or not but i should have just mentioned this before anyways.

attached are my diags.

once again, thank you.

drewbyserver-diagnostics-20251003-0305.zip

No disk errors so far. Regarding disk 2, check filesystem.

1 hour ago, Drewbyhans said:

However, it also says the unmountable disk present.

A rebuild does not clear an unmountable status (It clears Disabled status). As was mentioned you need to do a check filesystem to find/fix file system level corruption.

We often recommend this is done before the rebuild (in case a disabled disk is in better state than the emulated one) but it can be done at any point.

4 hours ago, itimpi said:

A rebuild does not clear an unmountable status (It clears Disabled status). As was mentioned you need to do a check filesystem to find/fix file system level corruption.

We often recommend this is done before the rebuild (in case a disabled disk is in better state than the emulated one) but it can be done at any point.

Should can/should i pause the data rebuild to do the a check filesystem?

Also i could have sworn i set this up as a BTRFS but it showing all my drives are XFS....

Edited October 3, 2025Oct 3 by Drewbyhans

I would say it depends on how far along it is, if it's been rebuilding for a few hours, it's probably best to wait.

1 minute ago, JorgeB said:

I would say it depends on how far along it is, if it's been rebuilding for a few hours, it's probably best to wait.

Yea it has been rebuilding for 5 hours. I will wait until its finished.

When I followed your instructions

• unassign the disk

• start array

• stop array

• reassign the disk

• start array

It automatically started the data rebuild. In the future, if it says its "unmountable status", what could i have done different to check filesystem first before it rebuilds?

48 minutes ago, Drewbyhans said:

what could i have done different to check filesystem first before it rebuilds?

When you started the array with the disk unassigned, it would already have been unmountable. At that time you could have checked the filesystem

35 minutes ago, JorgeB said:

When you started the array with the disk unassigned, it would already have been unmountable. At that time you could have checked the filesystem

Got it. Well I will update you guys after its done rebuilding!

It's working. I also replaced the PSU and its still good after that.

My guess is that when the UPS battery was unplugged, something happened to the psu it affected the drive. Probably just a shotty PSU / bad cables.

Thank you for all your help @JorgeB & @itimpi !