HP StorageWorks 2300 Disk System - Manual (Page 50)

50 Installation
3. Locate a place on the rack columns with the available space required
for the installation of the storage device. The storage device and the
rail kit require 3 EIA units of space.
Use the following table as a guide for placement of the rails in a Rack System/E
where multiple disk systems will be installed. You can rack multiple disk systems
without gaps installing rails every three EIA units. For example, starting at the
bottom of a 2-meter rack, set rails at the following unit/hole locations:
Table 7 Rail Positions for Sequential Disk Systems
Disk Systems Hole from Rack Bottom
One 1
Two 4
Three 7
Four 10
Five 13
Six 16
Seven 19
Eight 22
Nine 25
Ten 28
Eleven 31