If a PowerServer works in a cluster, the PowerServer will not only back up the "active" sessions but also the "passive" sessions. The "passive" sessions are remote sessions created by another PowerServer in the cluster and backed up in the current PowerServer.
The "active" sessions for a PowerServer will always be restored if that PowerServer shuts down abnormally and then is restarted by its Status Monitor, while the "passive" sessions will be restored only if you select the "Enable Logical Restore with Status Monitor" option in the AEM Cluster tool. If this option is not selected, Status Monitor will only restore the "active" sessions and will not restore the "passive" sessions on a PowerServer.
