In the case of a primary device failure, FortiAnalyzer HA uses the following rules to select a new primary:
* All cluster devices are assigned a priority from 80 to 120. The default priority is 100. If the primary device becomes unavailable, the device with the highest priority is selected as the new primary device. For example, a device with a priority of 110 is selected over a device with a priority of 100.
* If multiple devices have the same priority, the device whose primary IP address has the greatest value is selected as the new primary device. For example, 123.45.67.124 is selected over 123.45.67.123.
* If a new device with a higher priority or a greater value IP address joins the cluster, the new device does not replace (or pre-empt) the current primary device automatically.
FortiAnalyzer_7.0_Study_Guide-Online page 62