When powering on large number of containers, the containers power on a single ESXi host. This can cause CPU contention, causing ESXi management services to become unresponsive and hang.
DRS uses snapshot based placement that updates every 5 minutes resulting in each container power on getting very similar ESXi placement recommendations. In vSphere 6.5 a new DRS algorithm is introduced for continuous evaluation which will place the containers across the ESXi cluster using real time data. Accounting for the container resources about to power on in serial power on operations.
Requires vCenter 6.5 and ESXi 6.5. to enable continuous DRS
Disable the following features for the cluster using the VCH:
Set DRS to fully automated mode
Deploy the VCH using a resource pool. vAPP based VCHs will use the snapshot based evaluations in vSphere 6.5
Set AlwaysCheckPowerOn to true in vCenter.