Administrator Guide

Table Of Contents
Min Secondary Percent Before Swap (%)
Automatic Failover for Live Volumes
With Automatic Failover applied, the secondary Live Volume will automatically be promoted to primary in the event of a failure.
After the primary Live Volume comes back online, Automatic Restore optionally restores the Live Volume relationship.
Live Volume Automatic Failover Requirements
The following requirement must be met to enable Automatic Failover on a Live Volume.
Component Requirement
Live Volume attributes
Synchronous
High-Availability
Protected
Server host operating system
Any of the following operating systems:
VMware ESX 6.5
Windows Server 2012 R2 with Microsoft Hyper-V
Windows Server 2016 with Microsoft Hyper-V
Windows Server 2019 with Microsoft Hyper-V
Data Collector Ports Enable inbound traffic 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.
Storage Center Replications and Live Volumes
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