Chapter 9. Tuning WebSphere for Content Manager 257
9.2 Hardware tuning
This section discusses considerations for selecting and configuring the hardware
on which the application servers will run.
9.2.1 Processor speed
In the absence of other bottlenecks, increasing the processor speed often helps
throughput and response times. A processor with a larger L2 or L3 cache can
yield higher throughput even if the processor speed is the same as a CPU with a
smaller L2 or L3 cache.
9.2.2 Disk speed
Disk speed and configuration can have a dramatic effect on the performance of
application servers that run applications that are heavily dependent on database
support, that use extensive messaging, or are processing workflow. Disk I/O
subsystems that are optimized for performance, such as RAID array, are
essential components for optimum application server performance in these
environments.
9.2.3 System memory
Increasing memory to prevent the system from paging memory to disk is likely to
improve performance.
Try adjusting the parameter when the system is paging (and processor utilization
is low because of the paging).
Allow at least 256 MB memory for each processor. We recommend a minimum
value of 512 MB.
9.2.4 Networks
Run network cards and network switches at full duplex. Running at half-duplex
decreases performance.
Verify that the network speed can accommodate the required throughput. Make
sure that 100 MB is in use on 10/100 Ethernet networks.

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