Installation guide

7. Start system -config-cluster (refer to Section 5.2, “Starting the Cluster Configurat ion

Tool”). At the Cluster Configurat ion T ool tab, verify that the configuration is correct. At the

Cluster Status T ool tab verify that the nodes and services are running as expected.

Note

Make sure to configure other parameters that may be affected by changes in this section. Refer

to Section 5.1, “Configuration Tasks”.

5.5.2.2. Adding a Member to a Running DLM Cluster That Contains More Than Two Nodes

To add a member to an existing DLM cluster that is currently in operation, and contains more than two

nodes, follow these steps:

1. Add the node and configure fencing for it as in Section 5.5.1, “Adding a Member to a New Cluster”.

2. Click Send to Cluster to propagate the updated configuration to other running nodes in the

cluster.

3. Use the scp command to send the updated /etc/cluster/cluster.conf file from one of the

existing cluster nodes to the new node.

4. Start cluster services on the new node by running the following commands in this order:

a. service ccsd start

b. service cman start

c. service fenced start

d. service clvmd start, if CLVM has been used to create clustered volumes

e. service gfs start, if you are using Red Hat GFS

f. service rgmanager start, if the cluster is running high-availability services

(rgm anager)

5. Start system -config-cluster (refer to Section 5.2, “Starting the Cluster Configurat ion

Tool”). At the Cluster Configurat ion T ool tab, verify that the configuration is correct. At the

Cluster Status T ool tab verify that the nodes and services are running as expected.

Note

Make sure to configure other parameters that may be affected by changes in this section. Refer

to Section 5.1, “Configuration Tasks”.

5.5.3. Deleting a Member from a DLM Cluster

To delete a member from an existing DLM cluster that is currently in operation, follow these steps:

1. At one of the running nodes (not at a node to be deleted), start system-config-cluster (refer

to Section 5.2, “Starting the Cluster Configuration Tool”). At the Cluster Status Tool tab,

under Services, disable or relocate each service that is running on the node to be deleted.

2. Stop the cluster software on the node to be deleted by running the following commands at that

node in this order:

a. service rgm anager stop, if the cluster is running high-availability services

(rgm anager)

b. service gfs stop, if you are using Red Hat GFS

Red Hat Enterprise Linux 4 Cluster Administration