Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

41Understanding ISP
About ISP concepts
About reliability capabilities
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.
About rules
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.
About 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"
This example of a separation rule specifies that enclosures are to be treated as
individual fault domains:
separateby "Enclosure"
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.