xfs_admin man page on Archlinux

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xfs_admin(8)							  xfs_admin(8)

       xfs_admin - change parameters of an XFS filesystem

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

       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(8) can convert parame‐
       ters.  A number of parameters of a mounted filesystem can  be  examined
       and modified using the xfs_growfs(8) command.

       -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‐

       -c 0|1 Enable (1) or disable (0) lazy-counters in the filesystem.  This
	      operation	 may  take quite a bit of time on large filesystems as
	      the entire filesystem needs to be scanned when  this  option  is

	      With  lazy-counters  enabled,  the superblock is not modified or
	      logged on every change of the  free-space	 and  inode  counters.
	      Instead,	enough	information  is	 kept  in  other  parts of the
	      filesystem 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.

       -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.

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


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