Solved

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
5
250 Views
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
0
Comment
Question by:Nolan Gustavo
  • 3
  • 2
5 Comments
 
LVL 119

Accepted Solution

by:
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.
0
 
LVL 1

Author Comment

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
0
 
LVL 119
ID: 40618664
Correct HA fail over can take up to 2-3 minutes.

How quick are you expecting?
0
 
LVL 1

Author Comment

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.
0
 
LVL 1

Author Comment

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:

.
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

In this article, I will show you HOW TO: Install VMware Tools for Windows on a VMware Windows virtual machine on a VMware vSphere Hypervisor 6.5 (ESXi 6.5) Host Server, using the VMware Host Client. The virtual machine has Windows Server 2016 instal…
In this article, I show you step by step with screenshots to assist you - HOW TO: Deploy and Install the VMware vCenter Server Appliance 6.5 (VCSA 6.5), with some helpful tips along the way.
In this Micro Tutorial viewers will learn how to restore their server from Bare Metal Backup image created with Windows Server Backup feature. As an example Windows 2012R2 is used.
To efficiently enable the rotation of USB drives for backups, storage pools need to be created. This way no matter which USB drive is installed, the backups will successfully write without any administrative intervention. Multiple USB devices need t…

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question