VMware HA Failover

Posted on 2012-09-11
Last Modified: 2012-09-11
I currently have a VSphere 5.0 Update 1 Cluster with HA turned on. Host monitoring is turned on.Cluster settings are set to VM Restart Priority Medium, host isolation response is to leave powered on.  VM Monitoring Status (VM Monitoring) is set to disabled.

In the event of an HA event (host failure) will the VMs restart on the HA host if VM monitoring is disabled?
Question by:MISOperations
    LVL 116

    Accepted Solution

    Yes, check if the VM states it's HA Protected! It will then be restarted on another host due to a HA event (host failure).

    VM Monitoring restarts individual virtual machines when needed. VM monitoring uses a similar concept as HA, heartbeats. If heartbeats, and in this case VMware Tools heartbeats are not received for a specific amount of time the virtual machine will be rebooted. An example of when this will happen for instance is when a Windows virtual machine shows a BSOD.
    LVL 40

    Expert Comment

    Yes - HA is a host-level failure availability feature; VM monitoring is a subset of HA for individual VMs. So, for example, if a VM bluescreens, after a certain time interval of HA hosts NOT receiving 'heartbeats' via VMware Tools from the VM, the VM will be restarted ON THE SAME HOST. VMs on a host that has failed will of course be restarted on remaining working hosts.

    LVL 6

    Author Closing Comment

    Thanks for the help
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    no problems.
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    although for vSphere 4.1...

    the vSphere 4.1 HA/DRS Deepdive Kindle edition for FREE!


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