VMware Fault Tolerance (FT) - How to maintain HA during a reboot?

Akulsh
Akulsh used Ask the Experts™
on
I have setup FT on a VM in VMware 6.5. The objective was to have this server always available. However, after applying Windows updates when I reboot the server, the 'failover VM' does not seem to take over. Is this limitation of FT - that high availability is there only for unexpected hardware failure, not for software maintenance operations?

Is MS Cluster the only solution in this scenario? Thanks.

AKK
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Your FT Primary VM is in lock step "sync" with the Secondary VM.

This is to be expected and by design. All changes to the Primary will be reflected on the Secondary, especially if their is an OS failure e.g. BSOD on the Primary, will cause a BSOD on the secondary.

It it's FT based on Host Failure. If a Host fails due to uncontrolled shutdown, service will continue, because of the secondary on another host.

It depends what service you have,
Commented:
This is a very serious limitation of FT, beside the other ones like inability to do backups since you cannot take snapshots.
I think I will do Network Load Balancing for this web server.
FT is much ado about nothing...
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Correct, you cannot do snapshots.

If you have a Web Server, or Web Farm, A Network Load Balancer would be a much better choice, if configured correctly.

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Commented:
Conclusion: Stay away from FT feature of VMware.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
Depends on your requirements and selecting the correct technology to provide you desired level of service.

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