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Figure 3. InfiniBand link types

The host channel adapter (HCA) can divide (multiplex) each link into a set of virtual lanes, similar to

highway lanes (Figure 4). Using virtual lanes, an InfiniBand link can share bandwidth between

various sources and targets simultaneously. For example, if the HCA divides a 10 Gb/s link into five

virtual lanes, each lane has a bandwidth of 2 Gb/s. The InfiniBand architecture defines a virtual lane-

mapping algorithm to ensure inter-operability between end nodes that support different numbers of

virtual lanes.

Figure 4. InfiniBand virtual lane operation

Overhead in data transmission limits the maximum data bandwidth per link to a peak of 80 percent

of the signal rate. However, InfiniBand’s switched fabric design lets bandwidth scale as you add links

and nodes.

Sources

Targets

1x Link

(1 send channel

1 receive channel

each using differential voltage or

fiber optic signaling)

4x Link

12x Link

1 2 3 4 5 6 7 8 9 10 11 12

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HP Cluster Platform Cabling Tables Informationsblatt Seite 4