Datacenter Survivability
To provide the failover capability when the primary pool is unavailable, each Front End pool can be assigned a backup pool. This can be another pool in the same site, or more commonly will be a pool in a separate datacenter across a WAN link. Using a separate datacenter ensures the voice services are available in the event of a primary datacenter site failure. When assigned, as clients sign in, they will receive information about which pool is the primary and which pool is the backup. Figure 28.3 shows what happens in a datacenter failover scenario.
Figure 28.3 Datacenter Resilience
Note
Under normal operating circumstances, ...
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