VMWare 6.5 ESXi Latency to DataStore

At my work place - I regularly see messages like this in Solar Winds warning of latency between ESXi hosts and their data store. I have no idea why 20ms is chosen as the warning level. And I'm not sure exactly what type of latency is being referred to in this context. With ICMP I'm familiar with RTT time. But I imaging this is a different measurement. Does anyone know how vSphere measures "latency" from an ESX to its datastore? From a VM to its datastore? Thank you.

"NetPerfMon Event Log : The total latency between a san-server-01.acmeloans.com and a datastore is above 20 ms." action was executed successfully

StorageVirtualizationvSphereNetworkingVMware

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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

8/22/2022 - Mon

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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

3/12/2020

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amigan_99

3/12/2020

ASKER

Well it's a matter of trying to exculpate the network which I'm more involved with. UCS Blade-Fabric Interconnect-Nexus 6k-Tegile Storage array. 80 Gbps from the FIs to the 6k and the port channels for that barely hit 10% at peak. So when the VMW admins say they're seeing latency in their measures I'm not sure how to gauge that against what I'm seeing on the network side. And I'm not sure what's reasonable for the VM/Win admins to expect from the latency they're seeing.

Thanks much for the article. Next need to see how I can get logging from the array.

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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

3/12/2020

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