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xfs_freeze



SYNOPSIS

       xfs_freeze [ -fu ] mount-point


DESCRIPTION

       xfs_freeze  suspends and resumes access to an XFS filesys­
       tem (see xfs(5)).

       xfs_freeze halts new access to the filesystem and  creates
       a stable image on disk.  xfs_freeze is intended to be used
       with volume managers and hardware RAID devices  that  sup­
       port 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 com­
       plete, 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
       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.

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

       One of -f or -u must be supplied to xfs_freeze.


NOTES

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


SEE ALSO

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

                                                    xfs_freeze(8)
  




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