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We recommend that customers enable NUMA.We recommend that customers enable hyper-threading because doing so benefits the ESXi scheduling algorithm and, consequently, the virtualized workloads.While we await further information from the writers of the referenced document, it has become necessary for us at VMware to publicly provide a direct clarification to our customers who have expressed confusion at the statements above. VMware has contacted the writers of this document and requested corrections to (or clarification of) the statements because they do not, to our knowledge, convey known facts and they reflect a fundamental misunderstanding of vSphere features and capabilities. Virtual machine-based failover techniques break these application-specific failover capabilities.
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Lync Server 2013 has a rich set of application-specific failover techniques, including data replication within a pool and between pools. Moving a guest server while operating is not supported in Lync Server 2013. Virtual machine portability-the capability to move a virtual machine guest server from one physical host to another-breaks the inherent availability functionality in Lync Server pools.Shared resource techniques, including processor oversubscription, memory over-commitment, and I/O virtualization, cannot be used because of their negative impact on Lync scale and call quality.
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Many virtualization techniques that can lead to consolidation and optimization for other applications cannot be used with Lync Server.