Astaro Deployment Guide
High Availability Options
© 2011 Astaro GmbH & Co. KG – a Sophos company. Subject to change without notice.
9
HA Roles and Failover
Each node within the cluster can assume one of the following roles:
Master:
The primary system in a standby/cluster setup and responsible for synchronizing and
distribution of data within the HA system.
Slave:
The standby system in a standby/cluster setup which takes over operations if the master fails.
Worker:
A simple node in a cluster setup, responsible for data processing only.
All nodes monitor each other by means of a heartbeat signal, a periodically sent multicast UDP packet used to
check if the other nodes are still alive. If any node fails to send this packet due to a technical error, the node
will be declared dead. Depending on the role the failed node had assumed, the configuration of the setup
changes as follows:
Failover in Astaro HA systems
