COMPUTER SCIENCE AND ENGINEERING
CLOUD COMPUTING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In which scenario should the memory overcommitment ratio not be increased?
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The VM memory usage is low.
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The memory overcommitment ratio reaches 150% in commercial scenarios
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The customer requires that the maximum allowed number of VMs be deployed on a single host while ensuring performance.
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Customers’ hardware procurement costs need to be reduced.
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Explanation:
Detailed explanation-1: -We recommend 1:2 overcommit ratio between physical RAM and virtual RAM. Going above this is risky. Memory Usage on most of your clusters is high, around 90%. You should aim for 60% as you need to consider HA.
Detailed explanation-2: -Memory overcommitment allows a VM to use more memory space than the physical host has. Commonly used technologies include memory ballooning, memory sharing, and memory swapping.
Detailed explanation-3: -These are page sharing, ballooning, memory compression, and swapping.
Detailed explanation-4: -It is completely transparent to upper-layer users.
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