14 Implementing Cisco InfiniBand on IBM BladeCenter
The 4X InfiniBand HCAs installed in the blade servers are PCI Express x4 cards with two
output ports that are routed to bays 7 and 9. Two 4X InfiniBand high-speed switch modules
are installed in these bays (two modules provide redundancy). Because the 4X InfiniBand
HCA is a two-port card and not a four-port card, bays 8 and 10 are not connected.
The bridge module bays used in this configuration are bays 3 and 5, as shown in Figure 1-8.
Bridge modules in bays 3 and 5 can be a redundant pair or one can be a InfiniBand-to-Fibre
Channel bridge, and the other can be an InfiniBand-to-Ethernet bridge. See Chapter 2,
“InfiniBand products for BladeCenter” on page 15 for details about these bridge modules.
Bays 4 and 6 are also suitable for bridge modules, but these bays are not used in this
configuration because the 4X InfiniBand HCA does not have a third and fourth port.
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