VERITAS Storage Foundation 4.1 Intelligent Storage Provisioning Administrator's Guide

ISP Concepts
10 VERITAS Storage Foundation ISP Administrator’s Guide
This example of a separation rule specifies that enclosures are to be treated as individual fault
domains:
separateby "Enclosure"
Storage Layout Rules
Storage layout rules specify how storage is used to create volumes. The following are examples of
storage layout rules:
For example, the following rule specifies that a volume can be created using parity to provide data
redundancy:
parity true
Volume Template
A volume template (or template for short) is a meaningful collection of rules that provide a
capability. A template can specify one or more capabilities that a volume created using the template
may have, and consists of a collection of storage selection and layout rules. For example, a template
may allow you to create a volume that is able to tolerate the failure of a certain number of
controllers, or that has a certain number of copies of the volume data.
When creating a volume, it is easier to specify its desired capabilities than to specify the precise
layout of the volume on the available storage. ISP selects the appropriate templates and uses them
to create a volume with the desired capabilities.
If you specify parameter values for a volume’s capabilities, the rules that are defined within the
chosen template use these values when selecting and laying out storage. If not specified, the default
parameter values for a volume’s capabilities are assumed by the template.
Rule Description
log Specifies the type of log and its degree of redundancy.
mirror Specifies how many mirrors a volume should have.
parity Specifies whether redundancy is provided by using parity.
stripe Specifies how many columns a volume should have.
striped Specifies whether a volume is striped.