The CMS High Availability option ensures an uninterrupted data stream between the Communication Manager system and the CMS server, which stores the data. Some customers request continuous access to their CMS data. Following a major failure event on their primary HA server, customers have the option to switch over to their secondary server for purposes of CMS data monitoring and reporting. Perform a server switch-over when the anticipated downtime of the primary server is significant.

Customers choose from the following switch-over options:

• No switch-over: Customers who do not need continuous access to their CMS data can choose to remain on the primary server after a major failure. When the primary server goes down, the secondary server continues collecting call data without interruption. However, the restoration of the primary server enables customers to access the data.
• Manual server switch-overs: To maintain uninterrupted access to CMS data, perform a manual server switch-over. At a minimum, this process requires individual users to re-administer their CMS Supervisor clients to redirect them from the primary to the secondary server.

Customer network characteristics often require additional actions, including re-administration or the addition of NTS servers and the physical reconnection of peripheral devices. Customers considering the manual switch-over option must consult their TSO and CSI representatives to discuss logistical issues.