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

NAME
       xfs_admin - change parameters of an XFS filesystem

SYNOPSIS
       xfs_admin [ -eflpu ] [ -c 0|1 ] [ -L label ] [ -U uuid ] device
       xfs_admin -V

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

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

OPTIONS
       -e     Enables  unwritten  extent support on a filesystem that does not
              already have this enabled (for legacy filesystems, it  can't  be
              disabled anymore at mkfs time).

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

       -j     Enables version 2 log format (journal format  supporting  larger
              log buffers).

       -l     Print the current filesystem label.

       -p     Enable 32bit project identifier support (PROJID32BIT feature).

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

       -c 0|1 Enable (1) or disable (0) lazy-counters in the filesystem.

              Lazy-counters may  not  be  disabled  on  Version  5  superblock
              filesystems (i.e. those with metadata CRCs enabled).

              This operation may take quite a bit of time on large filesystems
              as the entire filesystem needs to be scanned when this option is
              changed.

              With  lazy-counters  enabled,  the superblock is not modified or
              logged on every change of the free-space and inode counters. In-
              stead, enough information is kept in other parts of the filesys-
              tem to be able to maintain the counter values without needing to
              keep them in the superblock. This gives significant improvements
              in performance on some  configurations  and  metadata  intensive
              workloads.

       -L label
              Set the filesystem label to label.  XFS filesystem labels can be
              at most 12 characters long; if label is longer than  12  charac-
              ters,  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 to uuid.  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 filesystem.  Note that on CRC-enabled filesystems,
              this will set an incompatible flag such that older kernels  will
              not  be able to mount the filesystem.  To remove this incompati-
              ble flag, use restore, which will restore the original UUID  and
              remove the incompatible feature flag as needed.

       -V     Prints the version number and exits.

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

SEE ALSO
       mkfs.xfs(8), mount(8), xfs_db(8), xfs_growfs(8), xfs_repair(8), xfs(5).

                                                                  xfs_admin(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO