HD latency measurement using bonnie++ on different machines with different RAM size

Posted by j0nes on Server Fault See other posts from Server Fault or by j0nes
Published on 2011-01-13T11:45:36Z Indexed on 2011/01/13 11:54 UTC
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Performance

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hard-drive

Hello,

I have run bonnie++ v1.96 on two different servers without any additional load. One server is a "physical" Dell server with 32GB RAM, the other one is a virtual instance with 14GB RAM. I have read in the bonnie manuals that I should use two times the size of RAM in my bonnie runs, so I used 64GB on the physical machine and 28GB on the virtual machine.

Now I want to compare the results, and I am wondering whether the results are comparable at all. The most interesting part is the latency part - on the physical machine, the values are about 10 times higher than on the virtual machine!

Can I take these results seriously (e.g. the virtual machine HD is much much faster) or does the different RAM size tamper the results?

Thanks! Jonas

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