HP 3PAR InForm OS 3.1.1 Messages and Operators Guide

A battery tray can hold a maximum of four BBUs. The number of BBUs and battery trays in a system
depends on the number of controller nodes installed (Table 3 (page 15)).
Table 3 Number of BBUs and Battery Tray Placement by Storage System Backplane and Number
of Controller Nodes
Tray PlacementBattery TraysBBUNodesBackplane
Below backplane122T400
Below backplane144
Below backplane122T800
Below backplane144
Below backplane (1)
Above backplane (1)
266
Below backplane (1)
Above backplane (1)
288
Magnetek Battery Backup Units
Magnetek BBUs have batteries that sit vertically, with battery A above battery B. (Figure 10
(page 15)).
Figure 10 Magnetek BBUs
When facing the rear of the storage system, Magnetek BBUs are numbered from right to left, 0
through 3. When two battery trays are present, the upper tray is numbered 0 and the lower tray
is numbered 1 (Figure 11 (page 16)).
Understanding Component Numbering 15