oot@FNOS:/# mount -t btrfs -o ro,usebackuproot,rescue=all /dev/mapper/trim_1e1cd702_5112_48bd_84d8_13bde4e0519c-0 /vol1
mount: /vol1: can't read superblock on /dev/mapper/trim_1e1cd702_5112_48bd_84d8_13bde4e0519c-0.
dmesg(1) may have more information after failed mount system call.
