HP 3PAR T-Class Installation and Deinstallation Guide

Figure 19 Battery Backup Unit
BBU placement and numbering schemes vary according to the type of components used in the
system.
A battery tray may 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 9 (page 31)).
Table 9 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
Battery Backup Units
BBUs include batteries resting vertically, with battery A above battery B. (Figure 20 (page 32)).
Understanding Component Numbering 31