FSFREEZESection: Maintenance Commands (8)
Updated: May 2010
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NAMEfsfreeze - suspend access to an filesystem (Linux Ext3/4, ReiserFS, JFS, XFS).
SYNOPSISfsfreeze -f mountpoint
fsfreeze -u mountpoint
DESCRIPTIONfsfreeze 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 unncessary 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)).
- -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.
AVAILABILITYThe fsfreeze command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
This document was created by man2html, using the manual pages.
Time: 05:34:26 GMT, December 24, 2015