Configuring Cluster Properties - Red Hat ENTERPRISE LINUX 5 - ADMINISTRATION Manual

Parameter
Label
Quorum Disk
Heuristics
Table 5.1. Quorum-Disk Parameters

5.3. Configuring Cluster Properties

In addition to configuring cluster parameters in the preceding section
Cluster Configuration
(optional), a Config Version (optional), and Fence Daemon Properties. To configure cluster
properties, follow these steps:
1. At the left frame, click Cluster.
2. At the bottom of the right frame (labeled Properties), click the Edit Cluster Properties button.
Clicking that button causes a Cluster Properties dialog box to be displayed. The Cluster
Properties dialog box presents text boxes for Cluster Alias, Config Version, and two Fence
Daemon Properties parameters: Post-Join Delay and Post-Fail Delay.
3. (Optional) At the Cluster Alias text box, specify a cluster alias for the cluster. The default cluster
alias is set to the true cluster name provided when the cluster is set up (refer to
"Starting the Cluster Configuration
distinguish it from other clusters and systems on your network (for example, nfs_cluster or
httpd_cluster). The cluster alias cannot exceed 15 characters.
4. (Optional) The Config Version value is set to 1 by default and is automatically incremented each
time you save your cluster configuration. However, if you need to set it to another value, you can
specify it at the Config Version text box.
5. Specify the Fence Daemon Properties parameters: Post-Join Delay and Post-Fail Delay.
a. The Post-Join Delay parameter is the number of seconds the fence daemon (fenced) waits
before fencing a node after the node joins the fence domain. The Post-Join Delay default
value is 3. A typical setting for Post-Join Delay is between 20 and 30 seconds, but can vary
according to cluster and network performance.
b. The Post-Fail Delay parameter is the number of seconds the fence daemon (fenced) waits
before fencing a node (a member of the fence domain) after the node has failed.The Post-Fail
Delay default value is 0. Its value may be varied to suit cluster and network performance.
Description
Specifies the quorum disk label created by the mkqdisk utility. If this field
contains an entry, the label overrides the Device field. If this field is used,
the quorum daemon reads /proc/partitions and checks for qdisk
signatures on every block device found, comparing the label against the
specified label. This is useful in configurations where the quorum device
name differs among nodes.
Program — The program used to determine if this heuristic is alive. This
can be anything that can be executed by /bin/sh -c. A return value of 0
indicates success; anything else indicates failure. This field is required.
Score — The weight of this heuristic. Be careful when determining scores
for heuristics. The default score for each heuristic is 1.
Interval — The frequency (in seconds) at which the heuristic is polled. The
default interval for every heuristic is 2 seconds.
Tool"), you can configure the following cluster properties: Cluster Alias
Tool"). The cluster alias should be descriptive enough to
Configuring Cluster Properties
(Section 5.2, "Starting the
Section 5.2,
53