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clement_lorvao
Contributor
Contributor

Fault Tolerance maximums

Hello,

I want to activate FT on 6 VMs (vSphere 6.7 U1).

This represents 10 vCPU per host.

We have Enterprise Plus licences so we can have up to 8 vCPU per VM.

There will have 3 VM per host so we respect the "das.maxftvmsperhost" paramters (4 by default).

But I have to modify the "das.maxftvcpusperhost" default value (8) to 10.

Is it possible?

Thanks

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jburen
Expert
Expert

I'm not sure if 8 vCPU/host is a hard limit or only a supported limit. I think you would have to try to be sure. But personally I would not go beyond a limit stated by the manufacturer. It could be you would have to add another host for this to work.

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jburen
Expert
Expert

I found an article where it says you could change the setting but you might run into issues: Changing advanced vSphere FT related settings, is that supported? - Yellow Bricks

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depping
Leadership
Leadership

I'm not sure if 8 vCPU/host is a hard limit or only a supported limit. I

Test limits for sure.

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depping
Leadership
Leadership

To my knowledge (See my blog Jeroen points you to above) you can change these settings, they are what VMware engineering and QE has tested with and recommend based on average bandwidth usage. If you increase this number it may have an impact on the required network bandwidth to maintain adequate performance.

I would recommend doing two things:

1. Ask the VMware Support team if it is okay to change this

2. Test if your applications / VMs still perform as expected as FT takes a heavy toll on the network.

Good luck,

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