NAME¶
fsfreeze - suspend access to a filesystem (Linux Ext3/4, ReiserFS, JFS, XFS)
SYNOPSIS¶
fsfreeze -f mountpoint
fsfreeze -u mountpoint
DESCRIPTION¶
fsfreeze suspends and resumes access to an filesystem
fsfreeze halts new access to the filesystem and creates a stable image on
disk.
fsfreeze is intended to be used with hardware RAID devices that
support the creation of snapshots.
fsfreeze is unnecessary for
device-mapper devices. The
device-mapper (and LVM) automatically freezes filesystem on the device when a
snapshot creation is requested. For more details see the
dmsetup(8) man
page.
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)).
OPTIONS¶
- -h, --help
- Print help and exit.
- -f, --freeze
- This option requests the specified a 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.
- -u, --unfreeze
- This option 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.
AUTHOR¶
Written by Hajime Taira.
NOTES¶
This man page based on xfs_freeze. One of
-f or
-u must be
supplied to
fsfreeze.
SEE ALSO¶
mount(8)
AVAILABILITY¶
The fsfreeze command is part of the util-linux package and is available from
ftp://ftp.kernel.org/pub/linux/utils/util-linux/.