Fortinet fortivoice Administrator's Manual page 68

Figure 23:Example active-passive HA group
This section contains the following HA failover scenarios:
• Failover scenario 1: Temporary failure of the primary unit
• Failover scenario 2: System reboot or reload of the primary unit
• Failover scenario 3: System reboot or reload of the secondary unit
• Failover scenario 4: System shutdown of the secondary unit
• Failover scenario 5: Primary heartbeat link fails
• Failover scenario 6: Network connection between primary and secondary units fails (remote
service monitoring detects a failure)
Failover scenario 1: Temporary failure of the primary unit
In this scenario, the primary unit (P1) fails because of a software failure or a recoverable
hardware failure (in this example, the P1 power cable is unplugged). HA logging and alert email
are configured for the HA group.
When the secondary unit (S2) detects that P1 has failed, S2 becomes the new primary unit and
continues processing phone calls.
There is no data loss when failover happens although active calls are disconnected and line
appearance and extension appearance take time to restore. Call data consists of the FortiVoice
call detailed records, recorded calls, voicemail, call directories, fax, and voice prompts. The
user web portal is not affected.
Here is what happens during this process:
1. The FortiVoice HA group is operating normally.
2. The power is accidentally disconnected from P1.
3. S2's heartbeat test detects that P1 has failed.
How soon this happens depends on the HA daemon configuration of S2.
4. The effective HA operating mode of S2 changes to master.
5. S2 sends an alert email similar to the following, indicating that S2 has determined that P1
has failed and that S2 is switching its effective HA operating mode to master.
This is the HA machine at 172.16.5.11.
The following event has occurred
'MASTER heartbeat disappeared'
The state changed from 'SLAVE' to 'MASTER'
Fortinet Technologies Inc.
Active-passive HA group
port1
172.16.5.10
(HA virtual IP: 172.16.5.2)
FortiVoice
port 2, 3 or 4
Switch
Heartbeat link
FortiVoice
port1
172.16.5.11
Page 68 FortiVoice Enterprise Phone System 4.0.0 Administration Guide
Primary unit (P1)
Secondary unit (S2)