Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

Using FileSnaps
Table 20-1 provides a list of Veritas File System (VxFS) commands that enable
you to administer FileSnaps.
Table 20-1
FunctionalityCommand
The fiostat command has the -S option to display statistics for each
interval. Otherwise, the command displays the accumulated statistics
for the entire time interval.
fiostat
The fsadm command has the -S option to report shared block usage
in the file system. You can use this option to find out the storage
savings achieved through FileSnaps and how much real storage is
required if all of the files are full copies.
See the fsadm_vxfs(1M) manual page.
fsadm
The fsmap command has the -c option to report the count of the total
number of physical blocks consumed by a file, and how many of those
blocks might not be private to a given file.
See the fsmap(1) manual page.
fsmap
Use the mkfs command to make a disk layout Version 8 file system
by specifying -o version=8. VxFS internally maintains a list of
delayed operations on shared extent references and the size of this
list (rcqsize) defaults to a value that is a function of the file system
size, but can be changed when the file system is made.
See the mkfs_vxfs(1M) manual page.
mkfs
Use the vxfilesnap command to create a snapshot of a file or set of
files or files in a directory. You can also use the vxfilesnap command
to restore a older version of the file to the current file.
See the vxfilesnap(1) manual page.
vxfilesnap
The vxtunefs command supports an option to enable lazy
copy-on-write tuneable, lazy_copyonwrite, on the file system, for
better performance.
See the vxtunefs(1M) manual page.
vxtunefs
297Administering FileSnaps
Using FileSnaps