Bought a new 1TB Sata SSD, thought i can just expand my cache pool by setting pool devices from 1 to 2 and add the second SSD to my old one holding my Docker container data (appdata folder). Didn't even noticed if it was BTRFS or XFS so afterwards i can not tell which it was.

Started the array and both drives where unmountable.

Wanted to undo my mistake, somehow managed to delete all pools and start a new one and added my original single SSD in hopes that the data on it will be there starting the array.

Still unmountable volume...

So did i break all the data on the disk?

Backups are there, but 1 day old and i simply don't want to accept that i have to recover them if i could simply regain my data and i only don't know how.

Got the drive with an USB adaptor hooked up to my Arch machine and Gparted tells me "unkown" fot this drive.

Any chance to get the data back?

Nevermind, was just too scared and couldn't think clearly. After a bit of reading in this wonderful forum i found out to just simply start array in maintenance mode and start a filesystem check firstly with -n and after finding that xfs is recoverable without the -n and tadaa everything is back up running now like it was before.

Doing a offload of the data from the cache drive right now to after this make a whole new pool out of those two SSDs and than move the contents of appdata back to this new pool. All of this using the usual mover way as some would do when changing SSDs etc.

Thanks anyways.