xfs_freeze

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 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 filesys
   tem 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 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.

   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).

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