JGhost7

Thanks for the reply. I tried it again and it seems to have worked. Not sure why it didn't previous.

Hi there, As the title states, I'm trying to reduce my btrfs cache pool to 1 drive from 2. I followed some instructions on other post, but I'm not able to get the pool down to 1 drive. Here's what I did so far: Converted pool to raid 1 so data on both drives are the same (confirmed balance was done and same data was on both drives). Remove 1 drive from pool and started the array after checking the checkbox I want to do this. Once I did that cache pool said it did not have a valid file format. If I try to add the 2nd drive back into the pool there is a warning message the 2nd drive will be erased. To get back up and running I ended up removing the cache pool entirely started array, then stopped array and added both drives as a new pool and started array and I was back up. I still am unable to remove the 2nd drive though. Is there a step I'm missing here? monolith-diagnostics-20241028-1153.zip

Thank you so much for your help on this! Life saver!

Awesome! Looks like it's mounted. Anything else I need to do?

So stop array and then start again. Correct?

root@Monolith:~# btrfs fi show Label: none uuid: cc168293-0670-41ca-955b-014ba3907a73 Total devices 1 FS bytes used 14.06GiB devid 1 size 30.00GiB used 19.99GiB path /dev/loop2 Label: none uuid: 183d90e6-6b8f-4e5b-a73e-e0e1766c837d Total devices 2 FS bytes used 208.92GiB devid 1 size 931.51GiB used 0.00B path /dev/nvme1n1p1 devid 2 size 1.82TiB used 218.06GiB path /dev/nvme0n1p1

root@Monolith:~# btrfs fi show Label: none uuid: cc168293-0670-41ca-955b-014ba3907a73 Total devices 1 FS bytes used 14.06GiB devid 1 size 30.00GiB used 19.99GiB path /dev/loop2 root@Monolith:~# fdisk -l /dev/nvme0n1 Disk /dev/nvme0n1: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors Disk model: Samsung SSD 970 EVO Plus 2TB Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes

Here's how I got here: I moved drives to different hardware (pc). I had 2 drives in a pool on the old system. I moved only 1 of the drives from the pool over to the new server and realized my mistake. I added the 2nd drive from the pool to the new rig and would receive this drive will get wiped on array start message. I followed directions in another post to remove the drives from the cache pool and start array without the drives. Stop array and then add them back in restarted array. This seemed to work and the server seemed like it was in it's previous state. Later in the night I rebooted the server and both drives seemed to be wiped with no file system. Both of the drives The drives were in btrfs format. I also did not format drives. Is there any way to salvage the drives info and restore my server? Thank you for your time/help. monolith-diagnostics-20240311-0801.zip

Thank you had this exact issue. Starting with no pool devices. Stopping then adding them back in worked!