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VMware ESX 5.5 High Availability did not work when network failed, how to configure HA so VMs failover when network fails?

Posted on 2015-02-19
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Last Modified: 2015-02-19
Hello all,

My customer has a VMware ESX 5.5 environment which consists of 5 hosts. One of the hosts lost network access to LAN and Management networks. None of the VMs failed over / migrated to the other hosts and became unavailable without network access until network access was restored. Checking the Cluster settings HA is enabled and Host Isolation is configured to Shut-Down. Now is this correct? How would I need to change the configuration so HA migrates VMs to another host in case this happens again?

Many Thanks,
Mark
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Question by:Nolan Gustavo
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 40618628
Firstly migration never happens with HA.

VMs are restarted automatically in a HA event when its uncontrolled.

So there will always be a few minutes of downtime.

Were there any errors?

Check DNS Reverse DNS and Default Gateway is contactable for ALL hosts.
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by:Nolan Gustavo
ID: 40618648
I have included a screenshot of the log, thank you for explaining this. Just looking at the logs I can see that there may have not been enough time for the VMs to shut-down and restart on another host.
Am I correct by thinking that if a host cannot be contacted for 15 seconds, it will start shutting down all VMs. These VMs will then be restarted on another host?
ee-VM-HA.PNG
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LVL 121
ID: 40618664
Correct HA fail over can take up to 2-3 minutes.

How quick are you expecting?
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by:Nolan Gustavo
ID: 40618768
Well judging by the time between network errors in the log I can see that network connectivity has been restored in less than 15 seconds. This means that host would have not given the shut down command, so this is not necessary a config issue/fault. Thank you for clarifying this.
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by:Nolan Gustavo
ID: 40618784
I've requested that this question be closed as follows:

Accepted answer: 250 points for Andrew Hancock's comment #a40618664
Assisted answer: 250 points for Andrew Hancock's comment #a40618628
Assisted answer: 0 points for MarkFogel's comment #a40618648
Assisted answer: 0 points for MarkFogel's comment #a40618768

for the following reason:

.
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