3PAR InForm® OS 2.2.4 Messages and Operator's Guide (320-200119 Rev A, March 2009)

2.11
Understanding Component Numbering
InForm OS Version 2.2.4
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Figure 2-11. Magnetek BBU Numbering Scheme
2.3.4 Controller Node Numbering
InServ T-Class Storage Servers contain two, four, six, or eight controller nodes per system.
The T-Class Storage Servers only use T-Class controller nodes.
Controller nodes are loaded into the storage server backplane enclosure from bottom to top.
Therefore, for an InServ T800 storage system with only two controller nodes installed, those
controller nodes would occupy the lowest 4U of the backplane and would be numbered
node 6 and node 7. The other bays in the backplane enclosure would be protected with filler
panels that block insertion of other components.
A controller node takes on the number of the bay that it occupies in the storage server
backplane, as shown in Figure 2-12.
0218_L_R1
Storage Server (Rear)
Storage Server Backplane
BBU 3Tray 0 BBU 2 BBU 1 BBU 0
BBU 3Tray 1 BBU 2 BBU 1 BBU 0