I am in the process of migrating/building a new UCM cluster on 2 x C210 Servers.
The first C210 has 2 x UCM V8.6 VMs created and operational. I have created another 2 x VMs on the 2nd of my C210 servers. Performance when instaling UCM V8.6 is very slow (almost unusable).
Both C210 servers are identical in build, HUU installed, ESXI 4,1, LRO disabled. VMs were created using the same Cisco OVA templates. No hardware errors are apparent on the server with slow performance issues.
It's an optimisation technique used by VMware - basically as I understand it it bundles several small TCP packets into a larger one, as it's faster to move one larger chunk of info than lots of smaller ones. All very nice, unless those packets are time critical such as heartbeats etc or presumably other stuff. CUCM etc use lots of small packets. That's why the recommendation is to turn it off...
There are probably better explanations available via google :-)
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The short answer is that you don't.... That isn't entirely true while at
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the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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