VERITAS Volume Manager 3.1 Administrator's Guide

Volume Manager Operations
Common Volume Manager Commands
Chapter 3134
they are not listed on thecommand line. Tunables listed on the command
line override those specified elsewhere.
Tunable parameters are as follows:
• Internal defaults—The built-in defaults are usedwhen the value for a
particular tunable is not specified elsewhere (on the command line or
in a defaults file).
• System-wide defaults file—The system-wide defaults file contains
default values that you can alter. These values are used for tunables
that are not specified on the command line or in an alternate defaults
file.
• Alternate defaults file—A non-standard defaults file, specified with
the command vxassist -d alt_defaults_file .
• Command line—The tunable values specified on the command line
override any values specified internally or in defaults files.
Defaults File The default behavior of the vxassist command is
controlled by the tunables specified in the /etc/default/vxassist file.
The format of the defaults file is a list of attribute=value pairs
separated by new lines. These attribute=value pairs are the same as
those specified as options on the vxassist command line (see the
vxassist(1M) manual page for details).
The following is a sample vxassist defaults file:
# by default:
# create unmirrored, unstriped volumes
# allow allocations to span drives
# with RAID-5 create a log, with mirroring don’t create a log
# align allocations on cylinder boundaries
layout=nomirror,nostripe,span,nocontig,raid5log,noregionlog,
diskalign
# use the fsgen usage type, except when creating RAID-5 volumes
usetype=fsgen
# allow only root access to a volume
mode=u=rw,g=,o=
user=root
group=root
# when mirroring, create two mirrors
nmirror=2
# for regular striping, by default create between 2 and 8 stripe
# columns
max_nstripe=8