C H A P T E R 7
Cisco Unity Failover and Standby Redundancy
See the following sections:
•Comparison of Cisco Unity Failover and Standby Redundancy, page 7-1
•Failover, page 7-1
•Standby Redundancy, page 7-2
Comparison of Cisco Unity Failover and Standby Redundancy
Cisco Unity failover provides system-malfunction failover within a data center. Failover consists of two servers, a primary and a secondary. In general, the primary server is active and taking calls, while the secondary is inactive and not taking calls. Any changes to subscriber or configuration data on the primary server are automatically replicated to the secondary server. If the primary server stops functioning for some reason, the secondary server automatically becomes the active server and starts taking calls. The primary server temporarily becomes inactive.
Cisco Unity standby redundancy provides disaster-recovery failover across geographic locations. There are still two servers, a primary and a secondary, but they are installed in separate data centers, commonly in separate cities. If the data center in which the primary server is installed is affected by a natural disaster or other catastrophe, someone in (or with remote access to) the disaster-recovery facility manually activates the secondary server, and the secondary server begins taking calls.
For more information on how failover and standby redundancy work, see the “About Cisco Unity Failover” chapter in the applicable Failover Configuration and Administration Guide for Cisco Unity at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_feature_guides_list.html.
Failover
For a list of the requirements for a failover system, see the “Requirements for Cisco Unity Failover” section in the System Requirements for Cisco Unity Release 5.0 at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_installation_guides_list.html.
Design Guide for Cisco Unity Release 5.x
