SGI 2400 Manuel de service télécharger pdf (Page 47)

Major Components

Premium Directory Memory

The optional premium directory DIMMs are required only for conﬁgurations with more

than 16 Node boards. These directory memory DIMMs maintain cache coherence in large

system conﬁgurations. Cache coherence helps provide data consistency when multiple

processors need to access the same piece of memory.

Hub

The Hub ASIC on the Node board is the primary communication link between the 64-bit

processor, the I/O subsystem, the main memory, and the CrayLink Interconnect. The

Hub also interfaces with directory memory, which is responsible for maintaining cache

coherence.

Status LEDs

Figure 2-8 shows the bulkhead on the front of the Node board. The LEDs provide status

information for the individual boards.

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SGI 2400 Manuel de service Page 47