HP Capacity Advisor 7.2 User Guide

NOTE:
In some situations, where time or time zones on a server are incorrect, it may appear that only old
data is available in the data collection. For more information on this topic, see the section “Handling
Old Data” in Chapter 9 (page 173).
The affect of invalid data on HP Smart Solver solution finding
The HP Smart Solver is set to ignore workloads having >25% invalid data; that is, the Solver will
not consider these workloads within an automated solution. This percentage can be adjusted, with
a corresponding affect on the Solver's ability to include workloads in its solution calculations. For
more information on what to do with workloads that violate this limit, see “When the threshold for
invalid data is exceeded” (page 177).
Utilization limits
The default utilization limits used globally across Capacity Advisor in the absence of user-defined
limits are the following:
• CPU utilization cannot exceed 70% of the capacity for more than 15 minutes at a time. (Seventy
percent is used as a default for CPU utilization as it provides acceptable performance with a
minimum of queuing in jobs.)
• Memory utilization cannot exceed 100% of the capacity. Typically memory should be set at
a value <100% to allow for memory use by the dynamic buffer cache and operating system
activity.
(For more information on how utilization is calculated for each resource, see Appendix (page 211)
.)
Specifying utilization limits
There are three building blocks to specifying a utilization limit:
• The limit
The maximum percentage or absolute amount of a resource allowed to be used by a workload.
For example, a CPU utilization limit might be “not above 90%” utilization.
• The resource
Utilization limits are applied to specific resources:
◦ CPU cores
◦ Memory
◦ Network I/O bandwidth
◦ Disk I/O bandwidth
28 Key Capacity Advisor concepts