Tricks and tips for everyone


How do you test a VM HA?

How do you test a VM HA?

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.

What happens if the passive node of a vCenter HA cluster fails?

What if the current Passive Fails? If the current Passive fails, then no failover will take place and there will be no loss in vCenter Server service availability. The VCHA Cluster will be reported in a degraded state until the “down” node rejoins the VCHA Cluster or is redeployed.

How HA will work if vCenter is down?

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.

What is the agent responsible for HA?

The first and probably the most important component that forms HA is FDM (Fault Domain Manager). This is the HA agent. The FDM Agent is responsible for many tasks such as communicating host resource information, virtual machine states and HA properties to other hosts in the cluster.

How do I know if HA is enabled in VMware?


  1. Browse to the cluster in the vSphere Client.
  2. Click Configure.
  3. Under Services, select vSphere DRS and click Edit.
  4. Select the Turn ON vSphere DRS and Turn on vSphere HA check boxes.
  5. Click OK.

What are the monitoring methods for vSphere HA?

VSphere HA offers a variety of VM management features, including disk and network monitoring, heartbeat customization, automatic VM restarts, automatic failover and affinity rules. You can use HA’s VM Monitoring features to check a VM’s I/O and determine disk and network activity.

How do I destroy vCenter ha?


  1. Power off and delete the Passive node and the Witness node virtual machines.
  2. Log in to the Active node by using SSH or through the Virtual Machine Console.
  3. To enable the Bash shell, enter shell at the appliancesh prompt.
  4. Run the following command to remove the vCenter HA configuration.
  5. Reboot the Active node.

How do I enable vCenter ha?


  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.

Does HA work without vCenter?

Hello, HA will work, because there is an HA agent running on each host, and the hosts monitor each other and keep lists of running VMs that need to be restarted in case of a host failure. vCenter is just used to (de-)activate and configure HA.

Does HA use vMotion?

HA does not use VMotion.

Does HA require VMotion?

How does VMware HA work?

How does VMware HA work? VMware HA continuously monitors all ESX Server hosts in a cluster and detects failures. An agent placed on each host maintains a “heartbeat” with the other hosts in the cluster and loss of a heartbeat initiates the process of restarting all affected virtual machines on other hosts.

Does HA use VMotion?

How do I fix vSphere HA virtual machine monitoring error?

So the quick fix I tried was to simply do a compute and storage migration of the VM to a different host and a different datastore to clean up any stale references to files or the VM world running. The event log of the VM immediately stopped spamming the HA message and returned to normal after migration.

What are the three host failure types in a vSphere HA cluster?

In a vSphere HA cluster, three types of host failure are detected:

  • Failure. A host stops functioning.
  • Isolation. A host becomes network isolated.
  • Partition. A host loses network connectivity with the primary host.

What is vCenter Server High Availability?

vCenter High Availability (vCenter HA) protects vCenter Server against host and hardware failures. The active-passive architecture of the solution can also help you reduce downtime significantly when you patch vCenter Server.

Is vCenter required for HA?

vCenter HA requires a single vCenter Server license.

Does VMware HA require DRS?

Running both VMware vSphere HA and DRS are highly recommended in a production vSphere Cluster. Using both technologies helps to make your workloads highly-available and ensures they continuously have the resources required based on the CPU/memory demands of the VM.

What is the difference between HA and vMotion?

HA will boot another copy of the vm up on a different host if your host goes down. VMotion is the method used to shift a live copy of a vm from host to host. If you do a migration, it can migrate without downtime with vMotion from Host A to Host B.

Why vSphere HA virtual machine monitoring error alarm is triggered?

Default vSphere alarms are set on the vCenter Server level and propagated to all child objects in the inventory….vSphere HA virtual machine monitoring action alarm (2064233)

Alarm name Trigger conditions Actions
vSphere HA virtual machine monitoring action vSphere HA enabled VM reset with screenshot vSphere HA is resetting VM No actions defined

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