Restarting ESXi services causes a False HA Alert on Select VMs

From time to time we restart the ESXi servers on all ESXi6 host using restart. What I have noticed is the one two separate occations we received an alert that two VM which are cluster that HA failed to restart them yet when you log onto the guest. The VM's new restarted nor did Windows Failover manager indicate the application failed over. I know when I host disconnects it kicks in the host isolation responce. My question is why only one VM on an affected host that was clusted?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
My question is why only one VM on an affected host that was clusted?

why indeed, weird things happen, and there is n logic or reason!

other than - restart, we all do it, but only in desperation, and lots of things can go weird, executing that command!

depending upon the reason why you need to do a restart, we often, regain control vMotion all VMs off quickly, and restart HOST!

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R@f@r P@NC3RVirtualization SpecialistCommented:

If you restart the host management agents, the vm are not affected during the restart of these services.

If you restart the host completely, your vm will be affected until the operating system of the host starts completely.

If you want to restart a Host completely, first perform a vmotion of your vm to other hosts, place the host in maintenance mode and restart it.

compdigit44Author Commented:
We run the restart command about once a correct to make sure the ESXi sevices on all hosts are refreshed and not having issues. Have seen odd issues in the past where an ESXi services were never restart for over a year
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R@f@r P@NC3RVirtualization SpecialistCommented:

I have not seen an ESXi where the management agents do not restart for a year.

Similarly, remember that when the management agents are restarted the vm of that host are not affected.

If you have a high availability cluster, you will always receive alerts about certain vm, depending on the event that happened.

compdigit44Author Commented:
I have seen issues when zoning a lun to the cluster leave, the cluster will use one host as the refernce host and if it is having issues, Other host will hosts will not see the new lun until the services are restarted. I had a case opened will support a while back and this was the recommendation
R@f@r P@NC3RVirtualization SpecialistCommented:

I recommend you monitor the behavior of the Cluster and the Hosts for a few days and tell us the results.

compdigit44Author Commented:
the cluster looked fine and think this was a false alarm
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