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14.6.3.2 Sizing when using Micro-Partitioning

Defining Virtual SCSI servers in micro-partitions enables much better granularity of processor

resource sizing and potential recovery of unused processor time by uncapped partitions.

Tempering those benefits, use of micro-partitions for Virtual SCSI servers slightly increases I/O

response time and creates somewhat more complex processor entitlement sizing.

The sizing methodology should be based on the same operation costs as for IBM i operating

system Server partitions. However, additional entitlement should be added for running in

micro-partitions. We recommend that the IBM i operating system Server partition be configured

as uncapped so it can take advantage of unused capacity of other partitions, it is possible to get

more processor time to service I/O.

Because I/O latency with Virtual SCSI varies with the machine utilization and IBM i operating

system Server topology, consider the following:

1. For the most demanding I/O traffic (high bandwidth or very low latency), try to use native

I/O.

2. If using Virtual I/O and the system contains enough processors, consider putting the IBM i

operating system Server in a dedicated processor partition.

3. If using a Micro-Partitioning IBM i operating system Server, use as few virtual processors as

possible.

4. In order to avoid latency issues try to always size the CPU generously

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008

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Intel AS/400 RISC Server Manual de usuario Pagina 240