VERITAS File System 4.1 Administrator's Guide

Storage Checkpoints

Storage Checkpoint Administration

Chapter 5 97

Storage Checkpoint Administration

Storage Checkpoint administrative operations require the utility (see the fsckptadm(1M)

manual page). You can use the fsckptadm utility to create and remove Storage Checkpoints,

change attributes, and ascertain statistical data. Every Storage Checkpoint has an associated

name, which allows you to manage Storage Checkpoints; this name is limited to 127

characters and cannot contain a colon (:).

Storage Checkpoints require some space for metadata on the volume or set of volumes

speciﬁed by the ﬁle system allocation policy or Storage Checkpoint allocation policy. The

fsckptadm utility displays an error if the volume or set of volumes does not have enough free

space to contain the metadata. You can roughly approximate the amount of space required by

the metadata using a method that depends on the disk layout version of the ﬁle system.

For disk layout Version 5 or prior, multiply the number of inodes (# of inodes) by the inode

size (inosize) in bytes, and add 1 or 2 megabytes to get the approximate amount of space

required. You can determine the number of inodes with the fsckptadm utility, and the inode

size with the mkfs command:

# fsckptadm -v info ’’ /mnt0

UNNAMED:

ctime = Mon Jan 01 12:20:54 2004

mtime = Mon Jan 01 13:37:06 2004

flags = largefiles, mounted,

# of inodes = 23872

# of blocks = 27867

# of overlay bmaps = 0

# mkfs -m /mnt0

mkfs -F vxfs -o bsize=1024,version=6,inosize=256,logsize=16384,

largefiles /mnt0

In this example, the approximate amount of space required by the metadata is 7 or 8

megabytes (23,872 x 256 bytes, plus 1 or 2 megabytes).

For disk layout Version 6, multiply the number of inodes by 1 byte, and add 1 or 2 megabytes

to get the approximate amount of space required. You can determine the number of inodes

using the fsckptadm utility as above. Using the output from the example for disk layout

Version 5 or prior, the approximate amount of space required by the metadata is just over one

or two megabytes (23,872 x 1 byte, plus 1 or 2 megabytes).