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VCS (Infoscale Availability) : How to switch a Service Group

by admin

You can switch a service group between systems to test failover. This also comes handy also during a maintenance activity to free up a system in the cluster. In order to ensure that failover can occur as expected in the event of a fault, test the failover process by switching the service group between systems within the cluster.

What happens during SG switch

– Switching a service group does not have the same effect as taking a service group offline on one system and bring the service group online on another system.
– When you switch a service group, VCS replicates the state of each resource on the target system.
– If a resource has been manually taken offline on a system before the switch command is run, that resource is not brought online on the target system.

Sequence of events during SG switch :
1. Take sources offline on source system
2. Bring resources online on the target system. Only resources online on source system are brought online on target system

Switching a Service Group

To switch a service group, use the command below:

hagrp -switch [group] -to [system]

Provide the service group name and the name of the system where the service group is to be brought online.

VCS (Infoscale Availability) : How to online and offline a Service Group
VCS (Infoscale Availability) – Difference Between Frozen and TFrozen attributes
VCS (Infoscale Availability) : How to freeze a Service Group

Filed Under: VCS

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