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Location: VMware
Discussion: Config for cpu and memory Settings in 'Edit Settings' & Resource Pools
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cluster
virtualization
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 SeanO'Brien |
Config for cpu and memory Settings in 'Edit Settings' & Resource Pools
Jul 28 2008, 11:17 AM EDT Wondering if there is a good detailed explanation of the settings for CPU and memory when set directly on a VM and when set on the resource pool a VM belongs to. What does each really mean and why would certain settings/changes do different things. Example: We have a R900 (4) socket quad code w/128 GB hosting about 15 SAP Dev and QA VM's. I have created 3 separate Resource Pools depending on utilization, etc... Also when a SAP install is occurring, I will move that machine into the 'High' Pool. Several times now we have seen the CPU within the VM Windows OS spiked at 100%, even though the VM has not ballooned and the performance for that VM on the CPU is maybe 60% when seen from the VI. Similar experience with the memory settings. The only fix I found (and I tried uping the CPU reservation to 20480 mhz for this one machine) was to shutdown the machine and change the CPU setting under 'Edit Settings' to 4 (it was set at 2). This made all the difference. Why would that make such a difference when the other changes and Resource Pool membership basically did nothing? I have also seen the same thing under the memory settings. Why would these changes be needed when the Resource Pool says the greater amount that I then change the VM to manually? Anyone else see these type of issues? Am I just not configuring from the beginning? Am I expecting too much of the dynamic changes that can be made in ESX? Thanks! 1 out of 1 found this valuable. Do you? |
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