FSSNAP(8) Maintenance Procedures FSSNAP(8)


fssnap - create temporary snapshots of a file system


fssnap [-F FSType] [-V] -o special_options /mount/point

fssnap -d [-F FSType] [-V] /mount/point | dev

fssnap -i [-F FSType] [-V] [-o special_options]
[/mount/point | dev]


The fssnap command creates a stable, read-only snapshot of a file system
when given either an active mount point or a special device containing a
mounted file system, as in the first form of the synopsis. A snapshot is
a temporary image of a file system intended for backup operations.

While the snapshot file system is stable and consistent, an application
updating files when the snapshot is created might leave these files in an
internally inconsistent, truncated, or otherwise unusable state. In such
a case, the snapshot will contain these partially written or corrupted
files. It is a good idea to ensure active applications are suspended or
checkpointed and their associated files are also consistent during
snapshot creation.

File access times are not updated while the snapshot is being created.

A path to the virtual device that contains this snapshot is printed to
standard output when a snapshot is created.


The following options are supported:

Deletes the snapshot associated with the given file

-F FSType
Specifies the file system type to be used. The
FSType should either be specified here or be
determined by matching the block special device
with an entry in the /etc/vfstab table, or by
consulting /etc/default/fs.

Displays the state of any given FSType snapshot. If
a mount-point or device is not given, a list of all
snapshots on the system is displayed. When a mount-
point or device is specified, detailed information
is provided for the specified file system snapshot
by default. The format and meaning of this
information is file-system dependent. See the
FSType-specific fssnap man page for details.

-o special_options
See the FSType-specific man page for fssnap.

Echoes the complete command line, but does not
execute the command.


The following operands are supported:

The directory where the file system resides.


See FSType-specific man pages for examples.


The following exit values are returned:

Successful completion.

An error occurred.


Specifies file system type.

Specifies the default local file system type.


attributes(7), fssnap_ufs(8)


This command might not be supported for all FSTypes.

August 11, 2004 FSSNAP(8)