Cisco Cucm Virtualization Requirements Link

: One virtual CPU (vCPU) must map directly to one physical CPU core (pCore).

: High-performance storage (SAN, NAS, or DAS) is required to maintain low I/O latency. cisco cucm virtualization requirements

Example: If the OVA defines 16 GB RAM, reserve all 16 GB. : One virtual CPU (vCPU) must map directly

When in doubt:

A 5-second drift between cluster members will break CDR, call history, and failover logic. cisco cucm virtualization requirements

: Use standard or distributed vSwitches.

Then cross-reference with the (you’ll need a Cisco.com login).