After a crash I checked my root partition using xfs_repair.
I was shocked, when xfs_repair did not find a superblock and no copy at all on the whole filesystem…
Though, I can still read only mount it and see the data.
Is there any way to recover or reconstruct a superblock? Well, xfs_repair did not find a second copy of it…
Actually “parted --list” is better, it indicates which file system is on each partition. For example on this system, /dev/sdb2 and /dev/sdc3 are XFS partitions; /dev/sda1 is the ext4 boot and root partition: