On Sat, Nov 13, 2021 at 08:37:19PM -0700, Tom Dial wrote: > Device UUIDs are kind of ugly, but in my experience they are stable > across both OS updates and physical movement of the file systems they > contain as long as what is copied is the disk partition. I do not think > copying a file system (e. g., with cp) to a new (partitioned) disk > would retain the block device UUID. My practice has been to copy raw > partitions, to a new disk, then expand the file system as appropriate.
Copying the contents of a file system, by using rsync or cp -a or similar commands, would not retain the file system's UUID. Copying the raw file system itself, by using "cp /dev/sda1 /dev/sdb1" or similar, should copy the file system's UUID over along with the contents, and the empty space, and the deleted data, and so on. I don't know anything about "block device UUIDs".
