Administrator Guide
Component Requirement
Data Collector Ports Enable inbound trac on port 3033
Tiebreaker
The tiebreaker is a service running on the Data Collector that prevents the primary and secondary Live Volumes from simultaneously
becoming active. If the secondary Storage Center cannot communicate with the primary Storage Center, it consults the tiebreaker to
determine if the primary Storage Center is down. If the primary Storage Center is down, the secondary Live Volume activates.
Automatically Failing Over
Enabling Automatic Failover on a Live Volume allows the secondary Live Volume to automatically activate in the event of a failure. The
following steps occur during an automatic failover.
Callout Object Callout Object
1 Primary Storage Center 4 Primary Live Volume
2 Tiebreaker 5 Secondary Live Volume
3 Secondary Storage Center 6 Servers
1 The primary Storage Center fails.
Figure 60. Step One
2 The secondary Storage Center cannot communicate with the primary Storage Center.
3 The secondary Storage Center communicates with the tiebreaker and receives permission to activate the secondary Live Volume.
4 The secondary Storage Center activates the secondary Live Volume.
Storage Center Replications and Live Volumes
549