Hallo, Hugo,

Du meintest am 27.02.12:

quoted

quoted

   mkfs.btrfs creates a new filesystem. The -L option sets the
   label
for the newly-created FS. It *cannot* be used to change the label
of an existing FS.

quoted

The safest way may be deleting this option ... it seems to work as
expected only when I create a new FS on 1 disk/partition.

   I've said this several times: Your expectations are wrong. You
don't label partitions.

Yes - now I know.
But I'm afraid other people also expect wrong - when I use mkfs.ext[234]  
then this option works (in another way than with "mkfs.btrfs").

Viele Gruesse!
Helmut