Veritas File System 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Storage Checkpoints
Storage Checkpoint Administration
Chapter 5 81
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).
Use the fsvoladm command to determine if the volume set has enough free space (seethe fsvoladm(1M)
manual page):
# fsvoladm list /mnt0