necessity of ClusterService group

[sam321]

why do we require ClusterService group

is it necessary to have it or cluster can work without it also

what are the steps to build it manually?

Regards

Kuldeep

[Gaurav_S]

Hi Kuldeep,

In a normal cluster, clusterservice group contains admin IP which is basically used for WebGUI (not java GUI) .. so you can have web based interface to manage your cluster. Clusterservicve group also contains a webservice resource (VRTSwebapp) & a NIC resource which hosts the admin IP.

so dependency goes like this:   NIC --> IP ---> Application (VRTSweb)

You can have a look at any of cluster which has cluster service group install & create the resources accordingly, only thing you need to remember is, you have to define correct NIC card (usually the public NIC) & a correct IP which is not used anywhere else...

IN case Global clusters (GCO), clusterservice will also contain WAC resource which is used for your WAN based replication.

Hope this helps

Gaurav

[Gaurav_S · Accepted solution]

Here is an excerpt from VCS admin guide about the group:

About the ClusterService group

The ClusterService group is a special purpose service group, which contains
resources that are required by VCS components.

The group contains resources for the following items:
■ Notification
■ Wide-area connector (WAC) process, which is used in global clusters

By default, the ClusterService group can fail over to any node despite restrictions
such as frozen. However, if you disable the AutoAddSystemToCSG attribute, you
can control the nodes that are included in the SystemList. The ClusterService
group is the first service group to come online and cannot be autodisabled. The
ClusterService group comes online on the first node that goes in the running state.
The VCS engine discourages the action of taking the group offline manually

G

[Marianne]

The ClusterService is no longer added by default added during initial installation and configuration (VCS 5.1).

I have simply added a notifier resource to an existing service group.

The only need that I see for this SG is when global clusters is deployed.

Please let us know your SF/HA and OS version? We can provide links to documentation that will contain the relevant info for your environment.

All documentation can be found here: https://sort.symantec.com/documents

[sam321]

thanks guys

thats really great to see so many responses in such short period of time

thanks Marianne and Gaurav

Marianne@ i am using vcs 5.0 and m building sfrac i was having Clusterserv ices group when i had installed and configured vcs but now when i installed and configured sfrac i dint go for Clusterservices resource group

and i dont think its required to have it as i see from your replies

[Zahid_Haseeb]

VCS ADMIN GUIDE 5.1, Page # 24

About the ClusterService group

The ClusterService group is a special purpose service group, which contains

resources that are required by VCS components. The group contains resources

for:

■ Cluster Management Console

■ Notification

■ wide-area connector (WAC) process, which is used in global clusters

The ClusterService group can fail over to any node despite restrictions such as frozen. The ClusterService group the first service group to come online and

cannot be autodisabled. The group comes online on the first node that goes in

the running

========================================================

So there are three resources which are normally in the Cluster Service Group

■ Cluster Management Console

■ Notification

■ wide-area connector (WAC) process, which is used in global clusters

See the below details to configure them manually

========================================================

VCS ADMIN GUIDE 5.1, Page # 103

Configuring the Cluster Management Console

manually

The resources required for the Cluster Management Console are configured in

the ClusterService group. This configuration is performed by the VCS

installation program if the Cluster Management Console option is selected

during installation. If the Cluster Management Console option was not selected

during VCS installation, you must create and configure the ClusterService

service group manually.

Review the instructions on configuring the console using the VCS Cluster

Configuration Wizard.

See “Configuring the ClusterService group” on page454 .

To configure the Cluster Management Console

1 Create a service group called ClusterService.

2 Add a resource of type NIC to the service group. Name the resource csgnic.

Configure the following attributes for the resource:

■ MACAddress: The physical address of the adapter to be configured to

host the virtual IP.

■ UseConnectionStatus: A flag that defines whether the NIC maintains its connection status.

3 Add a resource of type IP to the service group. Name the resource webip.

4 Configure the following attributes for the IP resource:

■ Address: A virtual IP address to be assigned to the Web Console. The

Web Console will be accessed using this IP address.

■ MACAddress: The physical address of the adapter on the system from

which the Web Console will run. MACAddress is defined as a local attribute for each system in the cluster.

■ SubnetMask: The subnet to which the virtual IP address belongs.

■ Critical: Set this attribute to True to make webip a critical resource.

5 Add a resource of type VRTSWebApp to the service group. Name the

resource VCSweb. Configure the following attributes for the resource:

■ Appname: Set to cmc.

■ InstallDir: Set to the path at which VRTSweb was installed, typically

C:\Program Files\VERITAS\VRTSWeb\VERITAS.

■ TimeForOnline: Set to 5.

■ Critical: Set this attribute to True to make VCSweb a critical resource.

6 Create the following resource dependencies:

■ Link the csgnic and webip resources such that the webip resource

depends on the csgnic resource.

■ Link the VCSweb and webip resources, such that the VCSweb resource

depends on the webip resource.

7 Enable all resources in the service group.

8 Bring the ClusterService service group online. You can now access the Web

Console at the URL http://IP_alias:8181/cmc. The variable

VCS ADMIN GUIDE 5.1, Page # 561

Configuring notification

Configuring notification involves creating a resource for the Notifier Manager

(NotifierMgr) agent in the ClusterService group.