On Mon, May 05, 2014 at 02:32:53PM -0400, Theodore Ts'o wrote:

quoted

 BTW, the current trend is to use GPT partition types to identify
 purpose of the partition filesystem (for example extra GUID for
 /home). It's FS independent solution and it allows use the right
 filesystems for the right mountpoints. It's very attractive for
 example for virtual images where you don't have to setup fstab and
 identify FS, but you still have (for example) /home on the right
 place.

But a partition only gets one GUUID and one partition type.  So are
you saying that the GUUID partition type would be used to indicate the
concept of "this is the file system for /home", *instead* of "this is
an btrfs file system" or "this is an ext4 file system"?

 Yes, GPT partition has two UUIDs, 
 
   - UUID = an unique partition identifier
   - GUID = partition type identifier

 I talked about the type (GUID). Note that this concept is just
 another point of view how to mount partitions, I don't think it will
 be a mainstream solution for standard machines. Now it's supported by
 systemd. More details:

  http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/
 

 For old good fstab you can use PARTUUID= to identify partitions and
 to bypass filesystem specific identifiers. In this case it's unique 
 partition identifier, no partition type.

    Karel

-- 
 Karel Zak  [off-list ref]
 http://karelzak.blogspot.com