Impressive Answers! When they ask you... If the vCenter server goes down with a situation that it was pre-configured with vSphere HA and DRS, so after power failure will HA and DRS perform their task? But fear not! With a little preparation, you'll know exactly what to say to impress. This is your best answer... vSphere HA is independent of vCenter server for its operations because when HA is configured, an agent is installed into each host who performs its part of function independent from the vCenter server.
The Interviewers will be impressed if you also explain... In any case of host failure, HA does not use vMotion, as it just starts VMs into another host. Whereas, vSphere DRS is dependent on vCenter server since it uses vMotion for its activities of live migration of VMs between multiple hosts. So, if vCenter server goes down, then the vMotion would also stop working leading to DRS failure.
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