Installation guide

d. service gfs start, if you are using Red Hat GFS
e. service rgm anager start, if the cluster is running high-availability services
(rgm anager)
6. At system-config-cluster (running on a node that was not deleted), in 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”.
5.5.6. Adding or Deleting a GULM Lock Server Member
The procedure for adding or deleting a GULM cluster member depends on the type of GULM node: either
a node that functions only as a GULM client (a cluster member capable of running applications, but not
eligible to function as a GULM lock server) or a node that functions as a GULM lock server. T he
procedure in this section describes how to add or delete a member that functions as a GULM lock
server. T o add a member that functions only as a GULM client, refer to Section 5.5.4, “Adding a GULM
Client-only Member”; to delete a member that functions only as a GULM client, refer to Section 5.5.5,
“Deleting a GULM Client-only Member”.
Important
The number of nodes that can be configured as GULM lock servers is limited to either one, three,
or five.
To add or delete a GULM member that functions as a GULM lock server in an existing cluster that is
currently in operation, follow these steps:
1. At one of the running members (running on a node that is not to be deleted), start system-
config-cluster (refer to Section 5.2, “Starting the Cluster Configuration Tool”). At the
Cluster Status T ool tab, disable each service listed under Services.
2. Stop the cluster software on each running node by running the following commands at each 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
c. service clvm d stop, if CLVM has been used to create clustered volumes
d. service lock_gulm d stop
e. service ccsd stop
3. T o add a a GULM lock server member, at system-config-cluster, in the Cluster
Configurat ion T ool tab, add each node and configure fencing for it as in Section 5.5.1, “Adding a
Member to a New Cluster”. Make sure to select GULM Lockserver in the Node Properties
dialog box (refer to Figure 5.6, “Adding a Member to a New GULM Cluster”).
4. T o delete a GULM lock server member, at system-config-cluster (running on a node that is
not to be deleted), in the Cluster Configuration Tool tab, delete each member as follows:
a. If necessary, click the triangle icon to expand the Cluster Nodes property.
Red Hat Enterprise Linux 4 Cluster Administration
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