Set the Elastic DRS policy on a cluster to optimize for either cost or performance.

Elastic DRS is set to Scale Up for Storage Only by default. In this mode, Elastic DRS adds hosts only when storage utilization exceeds the threshold of 75%.

When you enable Elastic DRS, you must choose a DRS policy. Each policy has its own set of resource utilization thresholds. Scale-out is triggered when a cluster reaches the high threshold for any resource. Scale-in is triggered only after all of the low thresholds have been reached.
Table 1. Optimize for Best Performance
Resource High Threshold Low Threshold
CPU 90% utilization 50% utilization
Memory 80% utilization 50% utilization
Storage 70% utilization 20% utilization
Table 2. Optimize for Lowest Cost
Resource High Threshold Low Threshold
CPU 90% utilization 60% utilization
Memory 80% utilization 60% utilization
Storage 70% utilization 20% utilization

Procedure

  1. Log in to the VMC Console at https://vmc.vmware.com.
  2. Click on the SDDC and then click Summary.
  3. On the card for the SDDC or cluster, click Edit EDRS Settings.
  4. Select the Elastic DRS policy you want to use.
    Option Description
    Scale Up for Storage Only This is the default setting. Elastic DRS adds hosts only when storage utilization exceeds 75%. No scale in operations are performed.
    Optimize for Best Performance

    Select the Minimum cluster size and Maximum cluster size.

    Elastic DRS adds hosts more quickly and removes hosts more slowly in order to provide best performance.

    Optimize for Lowest Cost

    Select the Minimum cluster size and Maximum cluster size.

    Elastic DRS adds hosts more slowly and removes hosts more quickly in order to provide the lowest cost.

  5. Click Save.