xfs_freeze suspends and resumes access to an XFS filesystem (see
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
The mount-point argument is the pathname of the directory where the
filesystem is mounted. The filesystem must be mounted to be frozen
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.
The -V flag prints the version number and exits.
Unless -V is specified, one of -f or -u must be supplied to
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.
This page is part of the xfsprogs (utilities for XFS filesystems)
project. Information about the project can be found at
⟨http://xfs.org/⟩. If you have a bug report for this manual page, see
⟨http://oss.sgi.com/bugzilla/buglist.cgi?product=XFS⟩. This page was
obtained from the project's upstream Git repository
⟨git://oss.sgi.com/xfs/cmds/xfsprogs⟩ on 2017-03-13. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail