fsfreeze(8) - phpMan
FSFREEZE(8) System Administration FSFREEZE(8)
fsfreeze - suspend access to a filesystem (Ext3/4, ReiserFS, JFS, XFS)
fsfreeze --freeze|--unfreeze mountpoint
fsfreeze suspends or resumes access to a filesystem.
fsfreeze halts any 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
fsfreeze is unnecessary for device-mapper devices. The device-mapper (and LVM) automati‐
cally freezes a filesystem on the device when a snapshot creation is requested. For more
details see the dmsetup(8) man page.
The mountpoint argument is the pathname of the directory where the filesystem is mounted.
The filesystem must be mounted to be frozen (see mount(8)).
Note that access-time updates are also suspended if the filesystem is mounted with the
traditional atime behavior (mount option strictatime, for more details see mount(8)).
This option requests the specified a filesystem to be frozen from new modifica‐
tions. 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.
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.
Display version information and exit.
Display help text and exit.
Written by Hajime Taira.
This man page is based on xfs_freeze(8).
The fsfreeze command is part of the util-linux package and is available from
util-linux July 2014 FSFREEZE(8)