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FSFREEZE(8)                                                        FSFREEZE(8)



NAME
       fsfreeze - suspend access to an filesystem (Linux Ext3/4, ReiserFS, JFS, XFS).

SYNOPSIS
       fsfreeze -f mountpoint

       fsfreeze -u mountpoint


DESCRIPTION
       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 unncessary for device-mapper devices. The device-mapper (and LVM) automatically freezes  filesystem
       on the device when a snapshot creation is requested.  For more details see the dmsetup(8) man page.

       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)).

OPTIONS
       -h, --help
              Print help 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 infor-
              mation 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 contain information on files that are still in
              the  process of unlinking.  These files will not be unlinked until the filesystem is unfrozen or a clean
              mount of the snapshot is complete.

       -u, --unfreeze
              This option is used to un-freeze the filesystem and allow operations to continue.  Any filesystem  modi-
              fications that were blocked by the freeze are unblocked and allowed to complete.

AUTHOR
       Written by Hajime Taira.

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

SEE ALSO
       mount(8)

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




                                   May 2010                        FSFREEZE(8)