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excessive vmotions on vCenter start


When a Virtual Center with a large number of hosts starts (either controlled or after a failure) a large number of vMotions have been initiated by DRS. Although this doesn’t directly cause an issue, it does impact the performance of the environment. A few days ago we noticed VMware posted kb2107950 acknowledging the issue.


To address the issue its necessary to update the vpxd.cfg file as directed in the article.


After updating the VC configuration you must restart the service, and you should no longer get the rush of vMotions we’ve witnessed previously.

Note: The default value is 50%, this means that by default once half the hosts controlled by a VC have posted quickstats, it begins calculating vMotions, this setting increases this to 90% of hosts, so the VC will have more information upon which it can base its decisions.