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JP1 Version 12 for Windows Systems JP1/Performance Management - Agent Option for Platform Description, User's Guide and Reference


2.3.7 Examples of using Agent for Platform - PFM In a virtualized system: Determining whether additional physical resources are needed

If physical resources always seem to be under load, consider adding another physical resource.

Note, however, that, even when a single guest OS or logical partition is under high load on a virtualized system, the system-wide load might seem low. Therefore, check whether all guest operating systems or all logical partitions are under high load.

When using PFM - Agent for Platform to check the load status in a virtualized system, you might require a different perspective from the one you use for an ordinary environment.

A virtualized system contains resources that can be changed dynamically, such as processors and memory. Therefore, when monitoring processor and memory usage, also monitor the items not easily affected by dynamic changes in resources, such as the current queue length and paging frequency.

The following graph gives an example of processor resources.

Figure 2‒3: Case in which additional processor resources are recommended (during processor usage monitoring)

[Figure]

In the figure example, the allocation ratio is being switched due to the high load of processor usage for logical partition B, but usage is high for both logical partitions A and B. In this kind of case, physical resources are insufficient.