HP 3PAR T-Class Installation and Deinstallation Guide

Figure 20 Battery Backup Units Have Batteries Resting Vertically
When facing the rear of the storage system, the 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 21 (page 32)).
Figure 21 BBU Numbering Scheme
Controller Node Numbering
A T-Class Storage System may contain two, four, six, or eight controller nodes per system.
Controller nodes are loaded into the storage system backplane enclosure from bottom to top. A
T800 storage system with only two controller nodes installed, the controller nodes occupy the
lowest 4U of the backplane and numbered node 6 and node 7. The empty bays in the backplane
enclosure with filler panels protect the node chassis.
Controller node positions in the storage system backplane, as shown in Figure 22 (page 33).
32 Storage System Physical Layout and Numbering