DRS Pairwise Balancing in vSphere 6.5 and 6.7

FRANK DENNEMAN | October 31, 2019

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Or maybe I should have called this blog post, “I’m seeing an excessive number of DRS initiated vMotions on my newly upgraded 6.5 environment”. Recently I was part of a few conversations about the nature of DRS load balancing in systems running vSphere 6.5 and newer. It was noticed that more vMotion operations where occurring since running 6.5 and it’s highly likely that these operations occur due to the new DRS pairwise balancing functionality. Pairwise balancing was introduced by vSphere 6.5 and is focused on keeping the host resource utilization disparity within a certain threshold. As a result, DRS performs load-balancing operations if the difference between the lowest-utilized host and the highest-utilized host is a certain percentage. That percentage depends on your migration threshold. The default migration threshold uses a 20% tolerable difference in utilization.

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