We used SQLIOSim to measure performance of prioritized and non-prioritized loads, while using LoadSim to generate competing load. In these tests we used both the default SQLIOSim configuration, as well as three other configuration files that operated in system memory.
Initially we measured performance with the two VMs splitting the available 4.7 GHz of processing power. In this configuration, in the memory intensive test, performance dipped between 4 percent and roughly 7 percent. We then allocated 3 GHz of processing power to the SQLIOSim system and the remaining 1.7 GHz to the LoadSim test system. Performance swung back to the level we saw when running SQLIOSim without any contention for resources.
ESX Server uses the same interface and conventions for allocating CPU performance and system memory through the Virtual Infrastructure Client. We could set CPU performance as a percent of available MHz or as a set number of MHz, as well as set the number of processors available. When it came to setting memory, we could allocate a percent of available memory or a specific number of megabytes to a given VM.
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VIRTUALIZATION BY THE NUMBERS |
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Yankee Group surveyed 700 IT managers and C-level executives about their virtualization plans. Respondents represent a wide variety of vertical and horizontal businesses: |
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