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xfs_admin(8)                System Manager's Manual               xfs_admin(8)

       xfs_admin - change parameters of an XFS filesystem

       xfs_admin [ -elu] [ -L label ] [ -U uuid ] device
       xfs_admin -f [ -elu] [ -L label ] [ -U uuid ] filename

       xfs_admin  uses the xfs_db(8) command to modify various parameters of a

       Devices that are  mounted  cannot  be  modified.   Administrators  must
       unmount  filesystems before xfs_admin or xfs_db can convert parameters.
       A number of parameters of a mounted filesystem can be examined and mod-
       ified using the xfs_growfs(8) command.

       -e   Enables  unwritten  extent  support  on a filesystem that does not
            already have this enabled.

       -f   Specifies that the filesystem image to be processed is stored in a
            regular file (see the mkfs.xfs -d file option).

       -l   Print the current filesystem label.

       -u   Print the current filesystem UUID (Universally Unique IDentifier).

       -L label
            Set the filesystem label.  XFS filesystem labels can be at most 12
            characters long; if label is longer than 12 characters,  xfs_admin
            will  truncate  it  and  print  a warning message.  The filesystem
            label can be cleared using the special ``--'' value for label.

       -U UUID
            Set the UUID of the filesystem.  A sample UUID  looks  like  this:
            "c1b9d5a2-f162-11cf-9ece-0020afc76f16".  The uuid may also be nil,
            which will set the filesystem UUID to the null UUID.  The uuid may
            also  be generate, which will generate a new UUID for the filesys-

       The mount(8) manual entry describes how to mount a filesystem using its
       label or UUID, rather than its block special device name.

       mkfs.xfs(8), mount(8), xfs_db(8), xfs_growfs(8), xfs(5).