HP Matrix Operating Environment Software - Manual (Page 75)

Figure 5-1 Comparison of three scenarios in a Capacity Advisor report
This report includes two consolidation solutions provided by the Smart Solver
(ServerConsolidationResult-SmallSystem and ServerConsolidationResults-BigSystem)
and the original pre-consolidation set of physical servers (ServerConsolidationScenario). For
more snapshots from this same report, see
“Scenario comparison report” (page 157) .
Calculating a virtualization consolidation ratio
It can be useful to look at the resulting ratio of virtual machines to physical servers after running
a system or workload consolidation simulation to help in evaluating the return on investment
for a particular configuration of machines. Currently, Capacity Advisor does not supply this
ratio in its reports, but you can easily calculate ratios for a set of scenarios that you wish to
compare.
Prerequisites
• You must be logged in to Insight Dynamics (see “Accessing Capacity Advisor” (page 55) ).
• You must have created a planning scenario that represents the system configuration that
you want to consolidate. (See
“Creating a planning scenario” (page 86) and “Editing a
scenario” (page 88) .)
• You must have consolidated the systems in the initial planning scenario onto the VM host(s)
of your choice. For purposes of comparison, you may want to save two to three different
consolidation simulations. (See
“Automated solution finding: System consolidation to VMs”
(page 109) .)
• You must have run a scenario comparison report that includes your initial planning scenario
and your consolidated scenario results. (See
“Using the report wizard to create a scenario
comparison” (page 74) .)
Procedure 5-28 Calculate virtualization consolidation ratios using data from a scenario comparison
report
1. Examine the scenario comparison report. (As an example, see Figure 5-1 (page 75) .)
2. For the systems scenario in the report, subtract the Number of VM Hosts in that scenario
from the Number of Physical Servers Including VM Hosts. This value represents the
number of physical servers that are to be consolidated into virtual machines.
3. For each consolidation solution scenario, calculate the virtualization consolidation ratio:
number_of_physical_servers /number_of_VM_hosts
For example, using the data in Figure 5-1 (page 75) , you can determine that the number of
physical servers to be consolidated is 20.
The ratio for the small system consolidation is 20/6, and the ratio for the big system consolidation
is 20/3 – meaning that the 20 physical servers can fit on 6 small VM hosts or 3 larger VM hosts.
Producing graphs and reports 75