What is ha in vCenter?

VMware vSphere HA (High Availability) is a utility included in VMware’s vSphere software that can restart failed virtual machines (VMs) on alternative host servers to reduce application downtime. This process of restarting failed workloads on secondary systems is called failover.

How does vCenter HA work?

vSphere HA provides high availability for virtual machines by pooling the virtual machines and the hosts they reside on into a cluster. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts.

Do you need vCenter for Ha?

vCenter HA requires a single vCenter Server license.

How do I enable HA on vCenter?


  1. Log in to the Active node with the vSphere Client.
  2. Select the vCenter Server object in the inventory and select the Configure tab.
  3. Select vCenter HA under settings.
  4. Click on the Set Up vCenter HA button to start the setup wizard.
  5. Click Management vCenter Server credentials.

Is Ha dependent on vMotion?

VMware HA and vMotion are two interwoven processes; VMware HA is dependent on vMotion. The technology of the migration process is designed so that there is no downtime and the user does not even notice these actions.

What is difference between DRS and HA?

VMware HA and DRS are each able to provide availability for VMs. The main difference between the two technologies is that VMware designed DRS to work in clustered environments, while HA enables admins to protect their VMs without having to deal with the cost or complexity of a failover cluster.

Does Ha work if vCenter is down?

HA (High Availability): HA is dependent on vCenter Server to monitor protected virtual machines. So if vCenter is down then currently protected virtual machines will be restarted on other ESXi hosts but you will not be able to protect any new virtual machines until vCenter is available.

Will ft work if vCenter is down?

What happens when vCenter is down? DRS (Distributed Resource scheduler) will not work, because moving the VMs between hosts is a vCenter function. Fault Tolerance (FT) will continue to work for the configured VMs, but in case of a failover no new secondary will be created.

How is vCenter licensed?

vCenter Server systems are licensed with vCenter Server licenses that have per-instance capacity. To license a vCenter Server system, you need a vCenter Server license that has the capacity for at least one instance.

What is PSOD in VMware?

A Purple Screen of Death (PSOD) is a diagnostic screen with white type on a purple background that is displayed when the VMkernel of an ESX/ESXi host experiences a critical error, becomes inoperative and terminates any virtual machines that are running.

Does HA use vMotion?

How can I check my vCenter ha status?

To check the current status of the HA cluster, open the vSphere Web Client and select Configure > vCenter HA. Click vCenter HA Monitoring to access the monitoring window. The window displays the current status of the Active, Passive and Witness nodes. Click vCenter HA Settings to go back to the management page.