fsfreeze man page on Archlinux

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FSFREEZE(8)		     System Administration		   FSFREEZE(8)

       fsfreeze - suspend access to a filesystem (Linux Ext3/4, ReiserFS, JFS,

       fsfreeze --freeze|--unfreeze mountpoint

       fsfreeze suspends and resumes access to an filesystem

       fsfreeze halts new access to the filesystem and creates a stable	 image
       on  disk.   fsfreeze  is intended to be used with hardware RAID devices
       that support the creation of snapshots.

       fsfreeze is unnecessary for device-mapper  devices.  The	 device-mapper
       (and  LVM)  automatically freezes filesystem on the device when a snap‐
       shot creation is requested.  For more details see  the  dmsetup(8)  man

       The  mount-point	 argument  is  the pathname of the directory where the
       filesystem is mounted.  The filesystem must be  mounted	to  be	frozen
       (see mount(8)).

       Note  that  access  time updates are also suspends if the filesystem is
       mounted with the traditional atime semantics (mount option strictatime,
       for more details see mount(8)).

       -h, --help
	      Display help text and exit.

       -f, --freeze
	      This  option  requests  the  specified a filesystem to be frozen
	      from new modifications.  When  this  is  selected,  all  ongoing
	      transactions  in	the  filesystem	 are  allowed to complete, new
	      write system calls are halted,  other  calls  which  modify  the
	      filesystem  are  halted,	and  all dirty data, metadata, and log
	      information are written to  disk.	  Any  process	attempting  to
	      write  to	 the  frozen  filesystem  will	block  waiting for the
	      filesystem to be unfrozen.

	      Note that even after freezing, the on-disk filesystem  can  con‐
	      tain  information	 on  files  that  are  still in the process of
	      unlinking.  These files will not be unlinked until the  filesys‐
	      tem is unfrozen or a clean mount of the snapshot is complete.

       -u, --unfreeze
	      This option is used to un-freeze the filesystem and allow opera‐
	      tions to	continue.   Any	 filesystem  modifications  that  were
	      blocked by the freeze are unblocked and allowed to complete.

       -V, --version
	      Display version information and exit.

       Written by Hajime Taira.

       This man page based on xfs_freeze.  One of -f or -u must be supplied to


       The fsfreeze command is part of the util-linux package and is available
       from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux			   May 2010			   FSFREEZE(8)

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