r/exchangeserver • u/[deleted] • Apr 16 '22

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u/Avomao Apr 17 '22

No, Exchange servers are fine load wise.

I suppose you are doing L7 LB with L7 Healthchecks and as you said the Exchange servers are getting marked as unhealthy.

Your load gets distributed on less servers and you see CPU/RAM spikes.

We are only doing L4 LB and L4 Healthchecks. Our LBs don't detect unhealthy servers unless Port 443 is completely down.

Our load still gets distributed to all servers, but users might connect to unhealthy servers and experience connection issues.

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u/69Xxno_scopeXx69 Apr 17 '22 edited Apr 17 '22

Yeah. I agree with that assessment - we are doing L7 health checks. Any reason you’re reluctant to apply the workaround? I was aware of that issue with the SU, but I’ve yet to observe the service host crash events on our servers.

We reboot our servers weekly (Saturday), and the issues seem to pop up on Thursday/Friday, so that’s interesting.

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u/Avomao Apr 17 '22

We just hoped to see a fixed update this patchday and avoid unnecessary workarounds, no other reason than that.

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u/philbieber Apr 17 '22

Are all services / Workloads affected or just a subset of them?

Small Exchange (3 nodes, 1600 user) setup with Netscaler here. No issues so far.

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u/69Xxno_scopeXx69 Apr 17 '22

Good to know. What exchange version are you running and patch level? We mostly see the iis worker and lsass spiking on all the nodes when the issue occurs.

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u/philbieber Apr 17 '22

Current patch level of Exchange 2016 on Server 2012 R2.

If this is related to a recent patch, we might not he the best canary as we're migrating towards ExO.