xfs_freeze(8) — Linux manual page

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 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
       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).

COLOPHON

       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,
       send it to linux-xfs@vger.kernel.org.  This page was obtained
       from the project's upstream Git repository
       ⟨https://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git⟩ on
       2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-05-17.)  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 to man-pages@man7.org

                                                           xfs_freeze(8)

Pages that refer to this page: fsfreeze(8), xfs_copy(8), xfs_metadump(8)

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