Installation guide

Table 5.1. Quorum-Disk Parameters
Parameter Description
Use a Quorum Disk Enables quorum disk. Enables quorum-disk parameters in the New
Configuration dialog box.
Int erval The frequency of read/write cycles, in seconds.
TKO The number of cycles a node must miss in order to be declared dead.
Votes The number of votes the quorum daemon advertises to CMAN when it has
a high enough score.
Minimum Score The minimum score for a node to be considered "alive". If omitted or set to
0, the default function, floor((n+1)/2), is used, where n is the sum of
the heuristics scores. T he Minimum Score value must never exceed the
sum of the heuristic scores; otherwise, the quorum disk cannot be available.
Device The storage device the quorum daemon uses. T he device must be the
same on all nodes.
Label Specifies the quorum disk label created by the m kqdisk 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.
Quorum Disk
Heuristics
Program — T he program used to determine if this heuristic is alive. T his
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.
Int erval — The frequency (in seconds) at which the heuristic is polled. The
default interval for every heuristic is 2 seconds.
5.3. Configuring Cluster Properties
In addition to configuring cluster parameters in the preceding section (Section 5.2, “Starting the Cluster
Configurat ion T ool”), you can configure the following cluster properties: Cluster Alias (optional), a
Config Version (optional), and Fence Daemon Propert ies. T o configure cluster properties, follow
these steps:
1. At the left frame, click Cluster.
2. At the bottom of the right frame (labeled Propert ies), 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, and Config Version,
and two Fence Daemon Propert ies parameters (DLM clusters only): Post-Join Delay and
Post-Fail Delay.
3. (Optional) At the Cluster Alias text box, specify a cluster alias for the cluster. T he default cluster
alias is set to the true cluster name provided when the cluster is set up (refer to Section 5.2,
“Starting the Cluster Configurat ion Tool”). T he cluster alias should be descriptive enough to
distinguish it from other clusters and systems on your network (for example, nfs_cluster or
Chapter 5. Configuring Red Hat Cluster With system-config-cluster
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