Administrator Guide

Automatic Swap Role for Live Volumes
Live Volumes can be congured to swap primary and secondary volumes automatically when certain conditions are met to avoid
situations in which the secondary volume receives more IO than the primary volume.
Attributes that Control Swap Role Behavior
When automatic swap role is enabled, the following limits determine when a role swap occurs.
Swap Role Limit Description
Min Amount Before Swap Species the minimum amount of storage space that must be
written to the Live Volume on the secondary Storage Center
before the roles can be swapped
Min Time As Primary Before Swap (Minutes) Species the number of minutes that must pass before the roles
can be swapped.
Min Secondary Percent Before Swap (%) Species 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.
1. The Automatically Swap Roles feature must be enabled for the Live Volume.
2. The timeout specied in the Min Time As Primary Before Swap (Minutes) eld must expire.
3. Over a ve 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
Storage Center version 6.7 or higher
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
• Windows Server 2012 with Microsoft Hyper-V
• Windows Server 2012 R2 with Microsoft Hyper-V
Virtual environment
• VMware
Data Collector Ports Enable inbound trac on port 3033
694
Storage Center Replications and Live Volumes