HP Cluster Platform Interconnects v2010 Quadrics QsNetII Interconnect - Page 32

Figure 3-6: QM511C Switch Card Each of the 16 downlinks of the first stage of switches connects to a QM500 network adapter. 2 of the 4 uplinks of each Elite in the first stage connect to 8 downlinks from the 2 second stage Elites. The 8 uplinks of the second stage Elites connect to the top level Elite, one link to each of the 8 top level switches across all 8 QM511C modules. 3.3.4 QM511L Switch Card The QM511L, shown in Figure 3-7, is a switch card containing a single Elite switch components. It has no ports and provides the top stage in the fat tree topology of clusters with fewer than 128 nodes. Figure 3-7: QM511L Switch Card The QM511L is a replacement for the omitted QM511C cards and completes network topology Each link of the Elite on the QM511L connects to one of the second stage Elites on each of the fitted QM511C cards. 3.4 QM503 Controller Card The QM503 controller card, shown in Figure 3-8, distributes clock signals and JTAG information to the switch cards. It also hosts a daughter card that supports management and diagnostic processes. Figure 3-8: QM503 Controller Card Fan B / Ctrl B Pri Clk Ok Sec Clk Ok B Clk Active Clk Error Federated Redundant Ctrl run Ctrl Error B Ctrl Active Fan Fail A Fan Fail B Reset Shutdown COM 1 Mouse Kybd 10/100 BASE-T VGA Pri Clk Sec Clk QUADRICS QM503 X Y Z[ \ ] 3-8 128-Port Interconnect Modules