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Answer:
Computer Hardware and Operating System Specification
A computer hardware and operating system specification describes the hardware and operating system configuration for the computers in your deployment. You want to size your hardware to the level of performance you require.
Table 3–1 lists the computer hardware that has been chosen for the Portal Service on Application Server Cluster reference configuration. This specification is meant to satisfy the requirements in Chapter 1, Performance Requirements.
In general, a hardware specification is based upon a sizing analysis that takes into account the size of the user base, the resource needs of each component, and the relative number of interactions (or hits) that are made on each component (see Interactions Between Reference Configuration Components). For the reference configuration, however, the approach has been to select the same hardware for each computer in the deployment architecture, and then use performance tests to determine the utilization of each computer under load conditions.
Using this approach, the absolute and relative sizing of the different computers in the deployment architecture can be determined and documented. For this purpose, the Sun FireTM T2000 server was selected as a basic, low-end, high-performance computer.
Note –
The T2000 server has performance limitations for deployments in which write-intensive Directory Server operations are required. Write operations are serialized and the T2000 cannot perform them in parallel. As a result, CPU utilization can be lower then 50 percent. This reference configuration does not involve write-intensive operations. However, if your solution has such requirements, consider using computers with a faster clock rate than the T2000 for the directory service module.
If your performance requirements are significantly different than the requirements of the reference configuration, you can specify hardware with more or less CPUs, more or less memory, and so on.
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