VERITAS Storage Foundation 4.1 Intelligent Storage Provisioning Administrator's Guide

Chapter 1, Understanding ISP
ISP Concepts
9
Reliability
Reliability specifies the level of redundancy that is required from a volume as a capability. Very
reliable volumes have a high degree of redundancy. For example, a very reliable volume could be
configured as a software mirrored volume built upon underlying prefabricated RAID-5 capable
LUNs that are configured in the enclosure hardware. A medium-level redundant volume could be a
simple 2-way mirror or RAID-5 volume configured either in software or on a suitable LUN within
a single enclosure.
Rule
A rule is a statement written in the VERITAS ISP language that specifies how a volume is to be
created. A rule can define selection of storage or layout of storage. Rules are usually gathered
together as templates for creating volumes, rather than being specified individually.
Examples of storage selection and storage layout rules are described in the following sections.
Storage Selection Rules
Storage selection rules specify what storage can be used to create volumes. The following are
examples of storage selection rules:
For example, the following rule specifies that any LUNs may be selected from the named
enclosures:
select "Enclosure"="ENC01", "Enclosure"="ENC02"
The next rule specifies that LUNs may be selected from the set of Hitachi disks that are located in
Room1:
confineto "VendorName"="HITACHI", "Room"="Room1"
Rule Description
affinity Attempts to select storage with shared attributes.
confineto Restricts selection of storage by specifying attributes.
exclude Prevents storage with certain attributes from being selected.
select Specifies the storage to be used.
separateby Defines fault domains for objects such as plexes.
strong separateby Does not allow objects in different fault domains to share attributes.