приостановить доступ к файловой системе (Ext3 / 4, ReiserFS, JFS, XFS) (suspend access to a filesystem (Ext3/4, ReiserFS, JFS, XFS))
Имя (Name)
fsfreeze - suspend access to a filesystem (Ext3/4, ReiserFS, JFS,
XFS)
Синопсис (Synopsis)
fsfreeze --freeze|--unfreeze mountpoint
Описание (Description)
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 snapshots.
fsfreeze is unnecessary for device-mapper devices. The
device-mapper (and LVM) automatically 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)).
Параметры (Options)
-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.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
FILESYSTEM SUPPORT
This command will work only if filesystem supports has support
for freezing. List of these filesystems include (2016-12-18)
btrfs, ext2/3/4, f2fs, jfs, nilfs2, reiserfs, and xfs. Previous
list may be incomplete, as more filesystems get support. If in
doubt easiest way to know if a filesystem has support is create a
small loopback mount and test freezing it.
Примечание (Note)
This man page is based on xfs_freeze(8).
