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

Table 1-1
Storage pool capabilities (continued)
DescriptionAdjustable parametersCapability
Provides reliability for RAID-5
logs by mirroring.
nlogs — number of log copiesRaid5LogMirroring
Provides performance by
striping across columns.
ncols — minimum number of
columns
nmaxcols — maximum
number of columns
Striping
Capabilities have variable parameters that you can specify, such as the number
of mirrors or columns. You can adjust the values of these parameters to tune the
characteristics of a volume. If you do not specify parameter values, default values
are used.
See “Capability” on page 195.
About performance capabilities
Performance specifies the capabilities of a volume based on factors such as number
of columns in striped volumes, stripe unit size, and preferred characteristics of
storage such as using prefabricated disks that are configured in hardware.
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.
39Understanding ISP
About ISP concepts