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B-6 SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
B.2 CPU Module
The CPU module consists of CPU and DDC. Up to four CPU modules can be mounted on a
CMU. There are four types of CPU modules.
FIGURE B-2 shows the CPU module.
FIGURE B-2 CPU Module
The CPU module has the following characteristics.
■ Active maintenance of CPU modules is possible using the DR function.
■ To perform active maintenance, you need to pull out the CMU from the system before
replacing the target CPU module.
■ A dedicated LSI for CPU is mounted.
■ One CPU chip is mounted on a CPU module. In case of SPARC 64 VI processor, one
CPU chip has two CPU cores, each of which has two threads. This means four threads per
CPU module.
In case of SPARC64 VII/SPARC64 VII+ processors, one CPU chip has four CPU cores,
each of which has two threads. This means eight threads per CPU module.
A thread is a component of a CPU that can execute threads. When viewed from Oracle
Solaris OS, one thread is seen as one CPU.
■ The performance difference between four types of CPU module is as follows.