So 24,000 BHCA per CUCM subscriber pair or an average of 12,000 BHCA per CUCM subscriber. Subscriber nodes: 6,000 users per Subscriber pair, assuming 1:1 redundancy. PUB and TFTP nodes: Consider the total BHCA for the cluster for the purpose of sizing, 12,000 users x 4 BHCA = 48,000 BHCA. Assumptions: 12,000 users/devices, 4 BHCA per user, No CUCM CDR Analysis and Reporting, one application upgrade at a time, one application DRS backup at a time. In this example, the deployment includes CUCM, IM & Presence, Unity Connection. The storage performance should be monitored so that the latency and storage performance requirements are met at all time. Note that with DAS, addressing IOPS requirements may require higher disk/spindle counts, which may result in excess storage capacity beyond minimum needed for the Collaboration applications.
IOPS requirements for the storage array is done by using the sum of Collaboration application VM's IOPS. To find information on the IOPS characterization for a specific Cisco Collaboration application, go the home page, in the "At a Glance - Cisco Virtualization Support" section, click on that specific Collaboration application, and look for the "IOPS and Storage System Performance Requirements" section.
Knowing the IOPS (In/Out Operations per second) utilization of the Cisco Collaboration applications ahead of time will help you design a storage array that will meet the storage latency and performance requirements of Collaboration applications.
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