Chapter 9 High Availability for FortiOS 5.0 : Operating a cluster
  
Operating a cluster
With some exceptions, you can operate a cluster in much the same way as you operate a standalone FortiGate unit. This chapter describes those exceptions and also the similarities involved in operating a cluster instead of a standalone FortiGate unit.
This chapter contains the following sections:
• Operating a cluster
• Operating a virtual cluster
• Managing individual cluster units using a reserved management interface
• The primary unit acts as a router for subordinate unit management traffic
• Clusters and FortiGuard services
• Clusters and logging
• Clusters and SNMP
• Clusters and file quarantine
• Cluster members list
• Virtual cluster members list
• Viewing HA statistics
• Changing the HA configuration of an operating cluster
• Changing the HA configuration of an operating virtual cluster
• Changing the subordinate unit host name and device priority
• Upgrading cluster firmware
• Downgrading cluster firmware
• Backing up and restoring the cluster configuration
• Monitoring cluster units for failover
• Viewing cluster status from the CLI
• Disconnecting a cluster unit from a cluster
• Adding a disconnected FortiGate unit back to its cluster