Adding A Member To A Running Dlm Cluster - Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Manual

Chapter 5. Configuring Red Hat Cluster With system-config-cluster
At the Fence Properties dialog box, click the Fence Device Type drop-down box and select
f.
the fence device for this node. Also, provide additional information required (for example, Port
and Switch for an APC Power Device).
g. At the Fence Properties dialog box, click OK. Clicking OK causes a fence device element to
be displayed below the fence-level element.
h. To create additional fence devices at this fence level, return to step 6d. Otherwise, proceed to
the next step.
i. To create additional fence levels, return to step 6c. Otherwise, proceed to the next step.
If you have configured all the fence levels and fence devices for this node, click Close.
j.
7. Choose File => Save to save the changes to the cluster configuration.
To continue configuring a new cluster, proceed to

5.5.2. Adding a Member to a Running DLM Cluster

The procedure for adding a member to a running DLM cluster depends on whether the cluster
contains only two nodes or more than two nodes. To add a member to a running DLM cluster, follow
the steps in one of the following sections according to the number of nodes in the cluster:
• For clusters with only two nodes —
Section 5.5.2.1, "Adding a Member to a Running DLM Cluster That Contains Only Two Nodes"
• For clusters with more than two nodes —
Section 5.5.2.2, "Adding a Member to a Running DLM Cluster That Contains More Than Two
Nodes"
5.5.2.1. Adding a Member to a Running DLM Cluster That Contains Only
Two Nodes
To add a member to an existing DLM cluster that is currently in operation, and contains only two
nodes, follow these steps:
1. Add the node and configure fencing for it as in
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. At system-config-cluster, in the Cluster Status Tool tab, disable each service listed under
Services.
5. Stop the cluster software on the two running nodes by running the following commands at each
node in this order:
a. service rgmanager stop, if the cluster is running high-availability services (rgmanager)
56
Section 5.6, "Configuring a Failover
Section 5.5.1, "Adding a Member to a New
Domain".
Cluster".