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 […]
VCS
VCS (Infoscale Availability) – Difference Between Frozen and TFrozen attributes
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 […]
VCS (Infoscale Availability) : How to freeze a Service Group
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 […]
VCS (Infoscale Availability) : How to switch 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 […]
VCS (Infoscale Availability) : How to online and offline 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 […]
VCS cluster 6.2 LAB : Installing VCS
If you have followed the first 4 posts of this series then you are ready to install the SFHA on the 2 nodes. We would also configure the I/O fencing using the installer. Unlike older version the I/O fencing can be configured with the help of installer. We don’t even have to initialize the disks […]
VCS cluster 6.2 LAB : Configuring Open-E DSS
In the last post we installed the Open-e DSS V7 Lite software. Let us now configure it in order to provision iSCSI storage for the 2 VM nodes of the cluster. Creating iSCSI volume We have allocated four 10Gb HDD for the VM. One out of this is used for the OS installation of Open-e […]
VCS cluster 6.2 LAB : Installing Open-E DSS
One of the most important components of this lab setup is the shared storage. I will be using the software Open-E DSS V7 lite version for the setup. The lite and the professional version software are the same except when we register the software we do it using the free key provided. The lite version […]
VCS cluster 6.2 LAB : Installing and configuring OEL
Installing the 2 nodes of the cluster The first step in the setup is to prepare the 2 nodes of the cluster. I have used Oracle enterprise linux 6.6 for the setup. You can use any OS of your choice supported by symantec. The VMs configuration is as follows : HDD – 20GB RAM – […]
VCS cluster 6.2 LAB with working I/O fencing : The setup
In one of my older posts I have configured VCS cluster home lab. The setup works fine but without I/O fencing configured. The setup configured in this series of posts has a working I/O fencing. The difference being the use of a different software iSCSI software – Open-E DSS V7 lite version. The other software […]