Blackberry PRD-10459-003 Administration Guide - Page 91
Configuring failover to occur when the standby BlackBerry Enterprise Server can
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Administration Guide How the BlackBerry Enterprise Server uses health parameters For example, when the BlackBerry Enterprise Server pair uses the default configuration, if the primary BlackBerry Enterprise Server cannot connect to the messaging server, and the standby BlackBerry Enterprise Server cannot browse the Internet, the primary BlackBerry Enterprise Server must demote itself because one of its health parameters indicates that it is not sufficiently healthy. The standby BlackBerry Enterprise Server, even though it is experiencing an issue, can promote itself to become the primary BlackBerry Enterprise Server because all of the required health parameters indicate that it is healthy enough to become the primary instance. Configuring failover to occur when the standby BlackBerry Enterprise Server can provide the same services that the primary BlackBerry Enterprise Server can provide If you move the failover threshold and promotion threshold so that the identical health parameters are above both thresholds, the primary and standby BlackBerry® Enterprise Server instances must meet the same requirements to be considered sufficiently healthy to run. You can move the promotion threshold to be the same as the failover thresholds if your organization requires that the failover process can promote a healthy standby BlackBerry Enterprise Server only. In this scenario, you configure the standby BlackBerry Enterprise Server to promote itself when it can provide most of the BlackBerry services that your organization requires. The primary BlackBerry Enterprise Server demotes itself when it cannot provide most of the BlackBerry services that your organization considers essential. For example, you can configure the failover threshold and the promotion threshold so that the primary and standby BlackBerry Enterprise Server instances must be able to connect to the BlackBerry® Infrastructure and messaging server and browse the Internet. If the primary BlackBerry Enterprise Server cannot connect to the messaging server and the standby BlackBerry Enterprise Server cannot browse the Internet, the standby BlackBerry Enterprise Server cannot promote itself because it is not sufficiently healthy. Configuring failover to occur when the standby BlackBerry Enterprise Server is in a healther state than the active BlackBerry Enterprise Server If you move the failover threshold and promotion threshold so that the promotion threshold is lower than the failover threshold, failover occurs only if the standby BlackBerry® Enterprise Server is healthier than the primary BlackBerry Enterprise Server that is sufficiently healthy to run. You can move the promotion threshold so that it is lower than the failover threshold if your organization wants to limit failover occurrences and requires that failover occurs only if the standby BlackBerry Enterprise Server meets all of your organization's requirements. In this scenario, you configure the standby BlackBerry Enterprise Server to promote itself when it can provide most or all of the BlackBerry services that your organization requires. The primary BlackBerry Enterprise Server does not demote itself as long as it can provide at least the BlackBerry services that your organization considers essential. For example, you configure the failover threshold so that the primary BlackBerry Enterprise Server must be able to connect to the BlackBerry® Infrastructure and messaging server and browse the Internet. You configure the promotion threshold so that the standby BlackBerry Enterprise Server must be able to connect to the BlackBerry Infrastructure and messaging server, browse the Internet, and process attachments. If the primary BlackBerry Enterprise Server cannot connect to the messaging server and the standby BlackBerry Enterprise Server cannot process attachments, the standby BlackBerry Enterprise Server cannot promote itself because it does not meet all of its requirements. 89