I had a disc go unmountable after an unclear power cycle. I attempted running a filesystem check via the GUI; and both using -n or not resulted in a "FATAL ERROR: ALLOWED MEMORY SIZE OF XXXXXX BYTES EXHAUSTED".
Running one via console; xfs_repair -nv completed so I ran xfs_repair -v and things stalled at process newly discovered inodes...
I quit the process and retried it. This time I let it go for a long time in case it was just taking a while, still stalling in the same spot.
So when that failed, I decided to try pulling the drive and replacing it with a new precleared disc to rebuild the array disc. Of course, it seemed to work until reboot when again this new disc is unmountable. I realize I skipped a few steps described here, but wanted to ask for help before I tried it since I did see some other posts stating rebuilding an unmountable disc will just end with another unmountable disc....