Veritas Storage Foundation Intelligent Storage Provisioning 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

Table 1-3
Storage layout rules (continued)
DescriptionRule
Specifies whether a volume is striped.striped
For example, the following rule specifies that a volume can be created using parity
to provide data redundancy:
parity true
About volume templates
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.
Table 1-4 shows some simple examples of templates and the capabilities that they
might provide.
Table 1-4
Example templates
Adjustable parameters for the
capability
Provides capabilitiesTemplate
nmirs — number of mirrors
(plexes)
DataMirroringDataMirroring
ncols — minimum number of
columns
logs — number of log copies
nmaxcols — maximum number
of columns
Raid5Capability,
Raid5LogMirroring
Raid5Volume
41Understanding ISP
About ISP concepts