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    Command:

    xfs_freeze

    
    
    

    SYNOPSIS

           xfs_freeze -f | -u mount-point
    
    
    

    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
           image  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
           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 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.
    
           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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