Cucm Hardware Requirements Updated -

The critical metric for storage hardware is IOPS (Input/Output Operations Per Second). CUCM generates a constant stream of database transactions, logs, and CDR (Call Detail Records). If the underlying hardware uses slow mechanical hard drives (HDDs) rather than Solid State Drives (SSDs), the database performance degrades. Furthermore, specific versions of CUCM mandate a particular disk size (e.g., 80 GB or 110 GB). While this seems small by modern standards, it is a strict requirement; the installation wizard will often fail if the virtual disk does not meet the exact size specified in the OVA template.

💡 Disk latency is the silent killer of CUCM clusters. If your storage cannot keep up with database replication, the cluster will become "out of sync," leading to administration failures and call processing issues. Network Interface Cards (NIC) 1 Gbps or 10 Gbps Ethernet interfaces are required. VMware vSwitch must be configured to prevent packet loss. Planning for High Availability (HA) cucm hardware requirements