VCS

Resource online basics Resources are brought online automatically when the service group is brought online. They can also be brought online manually after the maintenance task according to the order defined in the dependency tree. The resource agent runs the online entry point which in turn runs the specific startup operations required to bring the resource online. In normal day-to-day operations, you perform most management operations at the service group level. However, you may need to … [Read more...] about VCS (Infoscale Availability) : How to online and offline resources

These service group attributes are used to indicate that the service group is frozen due to an administrative command. When a service group is frozen, all agent online and offline actions are disabled. Difference between Frozen or TFrozen attributes - If the service group is temporarily frozen using the hagrp –freeze group command, the TFrozen attribute is set to 1. For example : # hagrp -freeze [group] # hagrp -value [group] Frozen - If the service group is persistently frozen using … [Read more...] about VCS (Infoscale Availability) – Difference Between Frozen and TFrozen attributes

Why freeze the service group When you freeze the service group in VCS, it will continue to monitor the resources in the cluster. But does not allow service group or the resources to be brought online or offline. Failover is also disabled during the freeze period of the service group. The use case for the SG freeze is during a maintenance activity at database or application end. The DBA or application administrator can stop and start the database or application outside of VCS control. This … [Read more...] about VCS (Infoscale Availability) : How to freeze a Service Group

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 … [Read more...] about VCS (Infoscale Availability) : How to switch a Service Group

What happens when you online a SG - When a service group is brought online, all the resources in that service group are brought online one by one starting from the child resource. - Depending on the dependencies defined, when all the resources are brought up, the service group becomes online. - In order to bring a failover service group online, VCS must verify that all non-persistent resources in the service group are offline everywhere in the cluster. If any non-persistent resource is online … [Read more...] about VCS (Infoscale Availability) : How to online and offline a Service Group