Administrator Guide

Swap Role Limit Description
Min Time As Primary Before Swap (Minutes) Specifies the number of minutes that must pass before the roles can be
swapped.
Min Secondary Percent Before Swap (%) Specifies the minimum percentage of IO that must take place on the
secondary volume before the roles can be swapped.
Triggering an Automatic Swap Role
For an automatic swap role to occur, the following events must take place.
Steps
1. The Automatically Swap Roles feature must be enabled for the Live Volume.
2. The timeout specified in the Min Time As Primary Before Swap (Minutes) field must expire.
3. Over a five minute period, one of the following limits must be exceeded for least 70% of the samples conducted during that time.
• Min Amount Before Swap
• 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 5.5
• VMware ESX 6.0
• VMware ESX 6.5
• Windows Server 2012 with Microsoft Hyper-V
• Windows Server 2012 R2 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
Storage Center Replications and Live Volumes 495