Improve company productivity with a Business Account.Sign Up

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 266
  • Last Modified:

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

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
0
Nolan Gustavo
Asked:
Nolan Gustavo
  • 3
  • 2
1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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.
0
 
Nolan GustavoAuthor Commented:
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
0
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct HA fail over can take up to 2-3 minutes.

How quick are you expecting?
0
 
Nolan GustavoAuthor Commented:
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.
0
 
Nolan GustavoAuthor Commented:
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:

.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

The 14th Annual Expert Award Winners

The results are in! Meet the top members of our 2017 Expert Awards. Congratulations to all who qualified!

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now