Modifying the VCS configuration files on existing nodes


Modifying the VCS configuration files on existing nodes
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Modify the configuration files on the remaining nodes of the cluster to remove references to the deleted nodes.

Tasks for modifying the cluster configuration files:

Edit the /etc/llthosts file
Edit the /etc/gabtab file
Modify the VCS configuration to remove the node

For an example main.cf:

To edit the /etc/llthosts file

On each of the existing nodes, edit the /etc/llthosts file to remove lines that contain references to the removed nodes.
For example, if sys5 is the node removed from the cluster, remove the line "2 sys5" from the file:
```
0 sys1
1 sys2
2 sys5
```
Change to:
```
0 sys1
1 sys2
```

To edit the /etc/gabtab file

Modify the following command in the /etc/gabtab file to reflect the number of systems after the node is removed:
```
/sbin/gabconfig -c -nN
```
where N is the number of remaining nodes in the cluster.

For example, with two nodes remaining, the file resembles:
```
/sbin/gabconfig -c -n2
```

Modify the VCS configuration file main.cf to remove all references to the deleted node.

Use one of the following methods to modify the configuration:

Edit the /etc/VRTSvcs/conf/config/main.cf file

This method requires application down time.
Use the command line interface

This method allows the applications to remain online on all remaining nodes.

The following procedure uses the command line interface and modifies the sample VCS configuration to remove references to the deleted node. Run the steps in the procedure from one of the existing nodes in the cluster. The procedure allows you to change the VCS configuration while applications remain online on the remaining nodes.

To modify the cluster configuration using the command line interface (CLI)

Back up the /etc/VRTSvcs/conf/config/main.cf file.

# cd /etc/VRTSvcs/conf/config

# cp main.cf main.cf.3node.bak

Change the cluster configuration to read-write mode:
```
# haconf -makerw
```
Remove the node from the AutoStartList attribute of the service group by specifying the remaining nodes in the desired order:
```
# hagrp -modify cvm AutoStartList sys1 sys2
```
Remove the node from the SystemList attribute of the service group:
```
# hagrp -modify cvm SystemList -delete sys5
```
If the system is part of the SystemList of a parent group, it must be deleted from the parent group first.
Remove the node from the CVMNodeId attribute of the service group:
```
# hares -modify cvm_clus CVMNodeId -delete sys5
```
If you have the other service groups (such as the database service group or the ClusterService group) that have the removed node in their configuration, perform step 4 and step 5 for each of them.
Remove the deleted node from the NodeList attribute of all CFS mount resources:
```
# hares -modify CFSMount NodeList -delete sys5
```
Remove the deleted node from the system list of any other service groups that exist on the cluster. For example, to delete the node sys5:
```
# hagrp -modify appgrp SystemList -delete sys5
```
Remove the deleted node from the cluster system list:
```
# hasys -delete sys5
```
Save the new configuration to disk:
```
# haconf -dump -makero
```
Verify that the node is removed from the VCS configuration.
```
# grep -i sys5 /etc/VRTSvcs/conf/config/main.cf
```
If the node is not removed, use the VCS commands as described in this procedure to remove the node.

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Removing a node from a cluster	Home	Modifying the Cluster Volume Manager (CVM) configuration on the existing nodes to remove references to the deleted node