HP Capacity Advisor 7.2 User Guide

To return to a planning checklist:
• Determining where to put a workload using automated solution finding (page 148)
Results: Automated workload stacking
Expected results
The solutions show the target systems with the selected workloads placed to require as few of the
target systems as possible. The target systems are either existing servers, “what-if” servers generated
by template, or a combination, depending on what targets you selected. When a combination of
servers are chosen, the placement of workloads goes first to existing servers and then to
template-generated “what-if” servers
Resource capacity
Workloads that specify utilization limits for a metric (for example, memory or disk I/O) can only
be placed on resources that define a capacity for the corresponding metric. In other words, if you
specified that a workload never exceed 100% memory utilization, that workload can only be
placed on a system for which total memory capacity is known.
Utilization limits
Every workload selected must have at least one utilization limit applied before using the Smart
Solver. This can be any type of utilization limit, including the default global utilization limit.
Headroom rating
The headroom rating shows the amount of available resource above the existing resource utilization
that will exist for the resulting solution in the simulation. Among the solutions that require the same
target systems, the solution with the tightest fit is shown.
Possible anomalies in the results
Fewer systems shown
The Smart Solver solution can contain fewer destination servers than were originally selected. This
occurs when the workloads fit on fewer servers than originally selected. For example, if servers A,
B, and C are selected as destinations, but all the workloads can fit onto servers A and B, then only
servers A and B are shown in the solution.
Systems involved in load balancing
When load balancing is performed, the loads are balanced only across the resulting systems in
the solution. For example, if only servers A and B are used (and server C is not), then load balancing
is performed only across servers A and B. Server C is not included for the load balancing calculation.
To return to a planning checklist:
• Determining where to put a workload using automated solution finding (page 148)
Getting more detail
In addition to the solutions shown, you can do the following with the solution:
1. Expand the sections using the + box on the right-hand side of the desired section.
2. Mouse over the headroom ratings (the stars) to obtain more rating detail.
3. Save the solution under a different scenario name and then use the Scenario Comparison
Report feature to compare the scenario differences.
98 Procedures