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February 10, 2005

The importance of distributing across LUNs

As an update to what I have been working on I have been running more IOMeter tests. This time with many more Virtual Machines. To do this latest set of tests I created a new Windows 2003 Enterprise Server image that is smaller. I also learned how to change the Machine name and IP address when deploying so deployment of many machines goes a lot faster now. Any way on to the tests.

The Tests

Below you will see four graphs. The graphs labeled with Split you will notice a bump at 13 Virtual Machines. The reason for this bump is because at that point it switched to having virtual machines on two different LUNs instead of just one. Because of that bump I reran the tests and the other graphs are the result. With the second set I started with 24 virtual machines, 12 on each LUN, and alternated between LUNs for deciding which VM to remove. As a result there are no bumps and I think a more accurate representation of performance.

Files

Here are the XLS files used to make the graphs.

8-22 VMs with the bump.

24 VMs Alternating.

Graphs

splitio.png splitmegabytes.png splitmegabytes.png megabytes.png

Posted by nekstrom at 01:20 PM | Comments (0) | TrackBack