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

NAME
       xfs_freeze - suspend access to an XFS filesystem

SYNOPSIS
       xfs_freeze [ -f | -u ] mount-point
       xfs_freeze -V

DESCRIPTION
       xfs_freeze  suspends  and  resumes  access  to  an  XFS filesystem (see
       xfs(5)).

       xfs_freeze halts new access to the filesystem and creates a stable  im-
       age  on  disk.   xfs_freeze is intended to be used with volume managers
       and hardware RAID devices that support the creation of snapshots.

       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)).

       The -f flag requests the specified XFS 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  at-
       tempting  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  in-
       formation  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.

       The -u flag is used to un-freeze the filesystem and allow operations to
       continue.  Any filesystem modifications that were blocked by the freeze
       are unblocked and allowed to complete.

       The -V flag prints the version number and exits.

       Unless -V is specified, one of -f or -u must be supplied to xfs_freeze.

NOTES
       A  copy  of  a frozen XFS filesystem will usually have the same univer-
       sally unique identifier (UUID) as the original, and thus  may  be  pre-
       vented  from being mounted.  The XFS nouuid mount option can be used to
       circumvent this issue.

       In Linux kernel version 2.6.29, the interface which XFS uses to  freeze
       and unfreeze was elevated to the VFS, so that this tool can now be used
       on many other Linux filesystems.

SEE ALSO
       xfs(5), lvm(8), mount(8).

                                                                 xfs_freeze(8)

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