I was going to format an old 2.5" disk I had in my old nas which used to host the OS (openmediavault), and in mid-formatting procedure realized its not an SSD (`blkdiscard /dev/sdb` and `cat /sys/block/sdb/queue/rotational` confirmed it).. its been many years and I forgot what that disk was.

I'll get another one but for now I cant start the array without it in it!

 

It says 

Stopped. Missing pool disk.

And attempted start at the popup says 

cache - too many wrong or missing devices

 

Regarding that small HDD (320gb) - Ideally, I'd have Unraid OS installed into it.. but I have not found any installers, everything is USB flash only, and it seems to me no point in having it part of my array, next to the 12tb disc....lol. So not sure what to do with it.

 

Just a side note - it seems that documentation is really lacking.. a lot of things are assumed are clear and obvious but are not.

Edited February 14, 20251 yr by Carmageddon

Attach Diagnostics to your NEXT post in this thread.

Apologies, I thought the question is generic and not specific.

attached.

nas-diagnostics-20250214-0112.zip

Question is whether or not the generic answer was appropriate to your specific situation.

 

https://docs.unraid.net/unraid-os/manual/tools/#new-config

hmm sounds like in this case, it will reset the array and I will lose all data I just successfully finished extracting from the failing drive...

Quote

Use the 'Preserve current assignments' selection to populate the desired disk slots after the array has been reset. By default no disk slots are populated.

This is what scares me, will it reset the array disk and it's data?

I now finished everything, closed the server and put it back on its spot - and having problems getting the parity disk to be accepted, so I guess it also has to be done via this "new configuration" - but I want to stress out, I dont want to lose the data in the array (made of a single 12tb disk)!

ok, I did some searching and confirmed "reset" doesnt delete anything.

 

I've tried it, but still stuck in the same issue - please see the screenshots before, and after - showing the drop down that I cant select the 2nd 12tb drive as party (the one ending at S1N), while it detects that SXML is part of the data array.

 

New diagnostics attached as well

nas-diagnostics-20250214-0207.zip

sdd is logging constant ata errors try replacing/swapping the cables, but could be a bad disk.

I am also trying to remove a cache drive from my cache pool. (i assume the default for a cache pool is Raid1 where it just mirrors data across each drive in the cache pool).

I originally had 2, (Samsung HDD 2TB and Samsung SSD 250GB and it was limited to 250gb), i have added a Kingston 2TB nvem m.2 drive as the 3rd in the cache pool and now want to remove cache 2.

I Stopped the array, removed the 2nd (by selecting 'no device'), and then started the array, i then wanted to stop the array and try to Remove the 2nd cache but after clicking stop array, it just seemed to think the array was stopped but kept saying stopping array for 20 mins or so, i could not press Start or Stop, so i rebooted. But then it would not boot into the ui, after a bit of stuffing around my usb got corrupted when putting into the windows pc, so i created a new usb, copied back over the config folder and luckily i had just backed up the day prior, so re started the server from the backup and its all back to normal now. But i want to remove the 2nd cache. What is the process process as i dont want to go through that again.

thanks

rossiserver-diagnostics-20250217-0906.zip

Post the output from

btrfs fi show

 

42 minutes ago, JorgeB said:

Post the output from

btrfs fi show

 

Attached,  thanks!

Assuming the 2TB devices are the ones you went to keep, with the array running type:

 

btrfs dev del missing /mnt/cache

 

Once that's done, reimport the pool with those two devices only:

 

on main click on the first device for that pool and then "remove pool"
back on main, create a new pool with two slots
assign the two pool devices, leave the filesystem set to auto
start the array to import the pool

 

On 2/14/2025 at 4:09 AM, JorgeB said:

sdd is logging constant ata errors try replacing/swapping the cables, but could be a bad disk.

Yes you were correct, I tested swapping the exact cables used by the array data disk, and same kind of errors - I've started an exchange at Best Buy, they shipped a replacement disk..

What are the chances, that 1/2 brand new disks is DOA lol its 50% failure rate...

12 hours ago, JorgeB said:

Assuming the 2TB devices are the ones you went to keep, with the array running type:

 

btrfs dev del missing /mnt/cache

 

Once that's done, reimport the pool with those two devices only:

 

on main click on the first device for that pool and then "remove pool"
back on main, create a new pool with two slots
assign the two pool devices, leave the filesystem set to auto
start the array to import the pool

 

 

thank you JorgeB, all working perfect now!