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node rejoins the cluster. Set the resource Failback mode to MANUAL to prevent the resource from
moving back to its preferred node when that node is brought back online, until you are ready to
allow it to happen.
The preferred node is the first server in the Assigned Nodes list for the resource.
IMPORTANT: Resources fail back only to the first node in their Assigned Nodes list. For example,
if a resource has failed over to three servers since it originally ran on its preferred node, and the
second server the resource was running on comes back up, the resource does not fail back to that
second server.
Resources do not automatically move from node to node just because a node higher in the Assigned
Nodes list rejoins the cluster, unless the Failback mode is set to AUTO and the first node in the
Assigned Nodes list rejoins the cluster.
9.7.2 Viewing or Modifying the Start, Failover, and Failback
Modes for a Resource
IMPORTANT: A cluster resource cannot be edited while it is loaded or running on a server. Make
sure to offline the resource before attempting to modify its resource properties, policies, or scripts.
If you are creating a new cluster resource, the Resource Policies page should already be displayed.
You can start with
1 In iManager, click Clusters and then click Cluster Options.
2 Browse to locate and select the Cluster object of the cluster you want to manage.
3 Select the box next to the resource whose Start, Failover, or Failback modes you want to view
or edit, then click the Details link.
4 Click the Policies tab.
5 (Conditional) Select the Resource Follows Master check box if you want to ensure that the
resource runs only on the master node in the cluster.
If the master node in the cluster fails, the resource fails over to whichever node becomes the
master.
6 (Conditional) Select the Ignore Quorum check box if you don't want the cluster-wide timeout
period and node number limit enforced.
The quorum default values were set when you installed Novell Cluster Services. You can
change the quorum default values by accessing the properties page for the Cluster object.
Selecting this box ensures that the resource is launched immediately on any server in the
Assigned Nodes list as soon as any server in the list is brought online.
7 Specify the Start, Failover, and Failback modes for this resource.
The default for both Start and Failover modes is AUTO, and the default for Failback mode is
DISABLE.
8 Continue with
cluster resource, click Next, then continue with
126 OES 2 SP2: Novell Cluster Services 1.8.7 for Linux Administration Guide
Step
5.
"Assigning Nodes to a Resource" on page
127, or if you are creating a new
"Assigning Nodes to a Resource" on page
127.
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Troubleshooting
