Once DRS is enabled, several algorithms and metrics are continually evaluated to ascertain the optimal VM placement. However, the user may need to set the appropriate threshold to balance how aggressively or conservatively DRS should migrate VMs. This will ensure that, based on the criticality of the workload, it can be migrated when required. Another rationale behind this setting is to ensure that there is no negative impact, such as a frequent ping-pong of VMs across hosts.