DRS recommendations are invoked after only 50% of the hosts in a cluster report quickstats data. Quickstats data is cleared after vCenter Service restarts. In larger clusters, DRS recommendations based on 50% of the host data may result in a large fluctuation of VMotions on restart of the vCenter service.
<vpxd>
<quickStats>
<HostStatsCheck>true</HostStatsCheck>
</quickStats>
<drmMinQuickStatsPerc>90</drmMinQuickStatsPerc>
</vpxd>