HP Matrix Operating Environment Software - Manual (Page 27)

You can avoid having the Smart Solver produce inaccurate or useless results by re-sizing your
systems before running the Smart Solver. If either of the above conditions exist in your situation,
consider increasing the number of cores on your simulated physical systems before running the
Smart Solver. (Select What-if Actions
→Edit System... on the System tab on the Edit Scenario
screen.) If you change the number of cores from 1 to 2 before consolidating, for example, the
resulting virtual machines will have enough cores to cover the virtualization overhead or a slower
VM host.
Re-sizing the virtual machines after running the Smart Solver can be less effort, as you only have
to re-size the VMs that have fewer stars than your desired goal. After adding more cores to the
VMs for which CPU resources are too tight, you can rerun Smart Solver to balance the load on
the VM hosts to improve the solution a bit more.
TIP: Use a Scenario comparison report to compare the headroom stars rating for saved scenarios.
Missing or invalid data
Data collected by Capacity Advisor is used in the scenarios you create and manipulate. During
an interval when no data was collected, the data is considered missing (data may not have been
collected, for example, because a system was down during data collection). Invalidated (or
invalid) data is data that you have marked as invalid.
For each metric about a system or workload, if a significant amount of data is missing or invalid,
the metric is followed by asterisks with the following meaning:
•
[blank] : 91% to 100% of data is valid.
• * : 51% to 90% of data is valid.
• ** : 11% to 50% of data is valid.
• *** : Less than 10% of data is valid.
• N/A: There is no valid data.
Thus, metrics asterisks are considered useful and reliable for analysis.
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
Appendix G (page 169) .
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 175) .
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.
Measuring and analyzing resource utilization 27