Blackberry PRD-10459-003 Administration Guide - Page 90
Defining when failover occurs
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Administration Guide How the BlackBerry Enterprise Server uses health parameters • The values for the health parameters that you define as part of the failover threshold for the primary BlackBerry Enterprise Server indicates whether a service or component is unhealthy. • The values for the health parameters that you define as part of the promotion threshold for the standby BlackBerry Enterprise Server indicate whether all the required services and components are healthy. • If you configure a health parameter for the primary BlackBerry Enterprise Server so that it is above the failover threshold, the health parameter value must indicate that the BlackBerry Enterprise Server service or component is healthy on the standby BlackBerry Enterprise Server before the automatic failover process can occur, even if you configure the health parameter to be below the promotion threshold line. You must configure the health parameters that you choose for the primary BlackBerry Enterprise Server so that they are above the failover threshold. You must configure the health parameters that you choose for the standby BlackBerry Enterprise Server so that they are above the promotion threshold. The BlackBerry Enterprise Server ignores the health parameters that you configure to be below the thresholds. The BlackBerry Enterprise Server updates the values of the health parameters periodically so that the BlackBerry Enterprise Server can determine automatically when a failover process should occur. Defining when failover occurs How you configure the failover threshold and promotion threshold impacts when failover occurs. You can configure the thresholds in any of the following ways: • For failover to occur when the standby BlackBerry® Enterprise Server is in an acceptable state, you can move the promotion threshold so that it is higher than the failover threshold. An acceptable state provides only the BlackBerry services that your organization considers essential. • For failover to occur only when the standby BlackBerry Enterprise Server is in a healthier state than the primary BlackBerry Enterprise Server, you can move the promotion threshold so that it is lower than the failover threshold. • For failover to occur when the standby BlackBerry Enterprise Server can provide the same services that the primary BlackBerry Enterprise Server can provide when it is healthy, you can move the promotion threshold so that it is equal to the failover threshold. Configuring failover to occur when the standby BlackBerry Enterprise Server is in an acceptable state By default, the thresholds are configured so that if the primary BlackBerry® Enterprise Server loses its SRP connection or its messaging server connection, or the primary BlackBerry Enterprise Server cannot browse the Internet, the primary BlackBerry Enterprise Server must fail over. The standby BlackBerry Enterprise Server can promote itself if it can connect to the BlackBerry® Infrastructure and messaging server. This default configuration is designed to make sure that the BlackBerry Enterprise Server remains in an acceptable state. To maintain the BlackBerry Enterprise Server in an acceptable state, you configure the standby BlackBerry Enterprise Server to promote itself when it is sufficiently healthy to provide the BlackBerry services that your organization considers essential. The primary BlackBerry Enterprise Server cannot demote itself as long as it provides the BlackBerry services that your organization uses but does not consider essential. 88
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