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Unformatted text preview: m memory configurations
with cost information and consolidation goals
to determine the optimum virtualization host
server memory size. • We took a snapshot of utilization data every
10 minutes over a five-week period.
• Each snapshot captured key Microsoft
Windows performance counters such as
minimum memory available. 5 White Paper Memory Sizing for Server Virtualization • Using our inventory database, we obtained information about 50% the total memory installed on each system. 43.9%
40 • We used the collected data to calculate maximum memory
consumption: 30 – For each snapshot, we calculated memory utilization by
subtracting the minimum memory available from the total 20 memory installed on the system.
13.5% 12.2% – We used the largest of all these calculated numbers 8.9% 10
5.9% 5.2% 6.7%
3.5% over the five-week period as our estimate of maximum
memory consumption. 0
< 500 MB 500 MB-1 GB 1-1.5 GB 1.5-2 GB 2-2.5 GB 2.5-3 GB 3-4 GB >4 GB Server Percentage by RAM Consumed Analysis of Memory Consumption
Based on the collected data, we analyzed memory consumption Figure 1. Analysis of memory consumption patterns showed
that nearly 50 percent of production servers used 1 GB of
memory or less. patterns within the sample of servers.
About 50 percent of the approximately 3,000 servers used no
more than 1 GB of memory, as shown in Figure 1.
For further analysis, we then divided the servers into four equal
groups, or quartiles, based on maximum memory utilization. We Top Quartile 3.33 calculated the average maximum memory consumption within
each quartile, as shown in Figure 2. Second Quartile When we excluded the top quartile—the 25 percent of servers 1.50 with the greatest memory consumption—we found that the
average among the remaining 75 percent was around 1 GB.
Third Quartile 0.86 We compared our results with data from other companies. Server
memory consumption was similar at these companies, with at least Bottom Quartile 50 percent of servers utilizing a maximum of 1 GB memory or less. 0.58 We then analyzed a subset...
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- Fall '11