Cache pool disk replacement went wrong?
My Cache pool consists of two NVMe M.2 SSDs. I need to increase them. So I thought stop the Server, replace one of the two disks and start the Server.
To my surprise the array comes up (different from replacing array drives). It shows a missing disk but I can't stop the array. Balance running is the message. What is balancing what? There's only one disk of the two-disk cache pool left. The new cache disk shows up under Unassigned devices.
What went wrong?
Any
One hour later. The balance of the remaining disk took an hour.
Stopped array, set new disk in second slot, and started array. What happens now? BTRFS is again writing at high speed to the remaining disk plus writing to the new disk.
Sorry BTRFS, this is a good laugh. During replacement of a (failing) disk BTRFS _writes_ at high speed to the remaining good disk _twice_. I would expect to read from the remaining disk and write to the new disk as the array does. I have no F