Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 420)

VMS Redundancy MN/22156, rev 12
C-10 VMS User Guide
The daily time is generally set for when traffic is typically at a low level, such as
early morning, for example.
Note that this feature provides a means of performing a full database synchroni-
zation automatically, that would otherwise have to be executed by the adminis-
trator/operator manually. Refer to the section, “Manual Synchronization” on
page C-5, for more information.
Priority
The Priority setting identifies where this server ranks in the redundant server
hierarchy for becoming active during a switch-over. The lower the number
entered, the higher the priority.
Set the Priority to a unique number in the range 0 to 31.
Caution: No two servers in a redundancy group should ever be assigned the
same priority; each server must have a unique number to prevent
contention.
Heartbeat Timing
The Redundancy Failover Time is set by specifying the values for Retry Delay
and Retry Count. The Failover Time is the amount of time that will pass prior
to a switch-over to a Standby server following a failure in communications
(heartbeat) with the Active server.
The Retry Delay represents how long the system waits before sending another
heartbeat request. The Retry Count represents how many heartbeats are missed
before the device is determined to be offline. Failover Time is calculated by
taking twice the Retry Delay value and multiplying it by the Retry Count value.
Generally, it is recommended to use the following values:
• For networks with up to 100 nodes — Retry Delay = 500 ms,
Retry Count = 10.
• For networks with over 100 nodes — Retry Delay = 500 ms,
Retry Count = 20.
Redundant Servers
The Redundant Servers box lists, by IP address, the other VMS servers that
are in the redundancy group with this server. Each VMS server in the group
must own a list that includes all of the other servers in that group.
Use the Add, Modify, and Remove buttons to create and maintain the list.
5. Configure the SNMP traps for this server. This may be required for relaying
server status information/alarms to a primary management system at the