I ran a "btrfs check" on one of the partitions that had issues last night to confirm that the file system was not damaged. No errors were found. # btrfs check -p /dev/sdc1 Checking filesystem on /dev/sdc1 UUID: d6640b4b-bd59-47d5-bfd7-37b4c40fb3c6 checking extents [.] checking free space cache [o] checking fs roots [O] checking only csum items (without verifying data) checking root refs found 1453455912960 bytes used, no error found total csum bytes: 1411701148 total tree bytes: 7534133248 total fs tree bytes: 3358851072 total extent tree bytes: 2426896384 btree space waste bytes: 695281951 file data blocks allocated: 3067911655424 referenced 6563527507968
-- Russell Mosemann