Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

Planning Storage 2–27
Geometry
The geometry parameters of a storageset can be specified. The geometry switches are:
■ CAPACITY—the number of logical blocks. The range is from 1 to the maximum
container size.
■ CYLINDERS—the number of cylinders used. The range is from 1 to 16777215.
■ HEADS—the number of disk heads used. The range is from 1 to 255.
■ SECTORS_PER_TRACK—the number of sectors per track used. The range is from 1
to 255.
Unit Switches
There are several switches that control the characteristics of units. The unit switches are
described under the
SET unit-number command in the Compaq StorageWorks HSG60 Array
Controller ACS Version 8.6 CLI Reference Guide.
One unit switch, ENABLE/DISABLE_ACCESS_PATH, determines which host connections
can access the unit, and is part of the larger topic of matching units to specific hosts. This
complex topic is covered in Chapter 1 under the following headings:
■ “Assigning Unit Numbers,” page 1–15
■ “Selective Storage Presentation,” page 1–20
Storage Maps
Configuring a subsystem will be easier if you know how the storagesets, partitions, and
JBODs correspond to the disk drives in your subsystem. You can more easily see this
relationship by creating a hardcopy representation (a storage map).
Creating a Storage Map
To make a storage map, fill out a blank storage map as you add storagesets, partitions, and
JBOD disks to your configuration and assign them unit numbers. Appendix A contains
blank templates you may use in the creation of your subsystem storage map. Label each
disk drive in the map with the higher levels it is associated with, up to the unit level.