xfs_freeze - suspend access to an XFS filesystem
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).
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