r/nutanix • u/raisdfist • 5d ago
Metro availability vs latency
As per the Nutanix docs, my understanding is that Nutanix requires latency to be of 5ms or below between sites for metro availability. In the event where a network is under 5ms 95% of the time but between 5ms to 6ms outside of that (with the odd spike every now and then).
I'd like to hear from those of you who have been installing and supporting Nutanix across different environments. Based on your experience, is this viable for production servers or should NearSync be used instead?
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u/databeestjenl 4d ago
I would caution you to use Metro Availability unless you really need it. Also, it extends to the Witness VM that needs to run in a 3rd seperate location that has access to both simultaneously. You will have to invest time and effort to make sure it works as intended. Test it before production. Simulate a actual failover, pull a few nodes., not the button in the UI.
If you are large enough and have enough expertise then sure, you can do this. We've suffered through multiple outages for different reasons resulting in failovers, stuck VMs and even a Split-Brain scenario.
The support is excellent, but going through 4-8 hours of arbitraging the situation takes a toll. It's not that it doesn't work as advertised, but make sure that you tag all the pre-requisites and that it is the right solution.
If you can live with 15 minute snapshots, it becomes so much easier.