Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

volume allocation which has proven too restrictive or discard it to allow a needed
allocation to succeed.
Rule file format
When you create rules, you do not define them in the /etc/default/vxassist
file. You create the rules in another file and add the path information to
/etc/default/vxassist. By default, a rule file is loaded from
/etc/default/vxsf_rules. You can override this location in
/etc/default/vxassist with the attribute rulefile=/path/rule_file_name.
You can also specify additional rule files on the command line.
A rule file uses the following conventions:
■ Blank lines are ignored.
■ Use the pound sign, #, to begin a comment.
■ Use C language style quoting for the strings that may include embedded spaces,
new lines, or tabs. For example, use quotes around the text for the description
attribute.
■ Separate tokens with a space.
■ Use braces for a rule that is longer than one line.
Within the rule file, a volume allocation rule has the following format:
volume rule rulename vxassist_attributes
This syntax defines a rule named rulename which is a short-hand for the listed
vxassist attributes. Rules can reference other rules using an attribute of
rule=rulename[,rulename,...], which adds all the attributes from that rule
into the rule currently being defined. The attributes you specify in a rule definition
override any conflicting attributes that are in a rule that you specify by reference.
You can add a description to a rule with the attribute
description=description_text.
The following is a basic rule file. The first rule in the file, base, defines the logtype
and persist attributes. The remaining rules in the file – tier0, tier1, and tier2 –
reference this rule and also define their own tier-specific attributes. Referencing
a rule lets you define attributes in one place and reuse them in other rules.
# Create tier 1 volumes mirrored between disk arrays, tier 0 on SSD,
# and tier 2 as unmirrored. Always use FMR DCO objects.
volume rule base { logtype=dco persist=yes }
volume rule tier0 { rule=base mediatype:ssd tier=tier0 }
Creating volumes
Using rules and persistent attributes to make volume allocation more efficient
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