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americanairpower.info

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May 16, 2008 8:58 p.m.

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certifyme.com

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Vmware VCP-310 Exam, Microsoft 70-292 Exam, Cisco Ccna 640-802

Source: http://www.americanairpower.info/?p=447

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You work as a network administrator for Certifyme .com. You have a dual-processor VM (Virtual Machine) that has affinity set so that the virtual CPUs are pinned to CPU 3 and 4 in VirtualCenter. The VM also has a reservation setting guaranteeing it 100% of available resources 640-802 for those two CPUs. Performance is poor in this VM, however performance for all other VMs on this is acceptable. What can you do to improve performance for this VM? A. change the CPU share allocation from ‘Normal’ to ‘High’ B. set CPU affinity on all other VMs prohibiting them from using CPU 3 and 4. C. Remove the reservations on the CPUs inorder to allow the VMKernel to switch the virtual CPUs between CPU 3 and 4 as needed. D. Change the SPU affinity settings to ensure that virtual CPUs are running on two separate physical CPUs on the host. Answer: D Explanation: Resource Management Guide - Chapter 9 Advance Resource Management - Pg. 126 In some cases, such as display-intensive workloads, significant communication might occur between the VCP-310 virtual CPUs and these other virtual machine threads. Performance might degrade if the virtual machine’s affinity setting prevents these additional threads from being scheduled concurrently with the virtual machine’s virtual CPUs (for example, a uniprocessor virtual machine with affinity to a single CPU, or a two-way SMP virtual machine with affinity to only two CPUs). For the best performance, when manual affinity settings are used, VMware recommends that you include at least one additional physical CPU in the affinity setting in order to allow at least one of the virtual machine’s threads to be scheduled at the same time as its virtual CPUs (for example, a uniprocessor virtual machine with affinity to at least two 70-292 CPUs or a two-way SMP virtual machine with affinity to at least three CPUs). (Virtual Machine) that has affinity set so that the virtual CPUs are pinned to CPU 3 and 4 in VirtualCenter. The VM also has a reservation setting guaranteeing it 100% of available resources for those two CPUs. Performance is poor in this VM, however performance for all other VMs on this is acceptable.

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