Installation guide

Note

Clicking Apply on the Quorum Partit ion tab propagates changes to the cluster

configuration file (/etc/cluster/cluster.conf) in each cluster node. However, for the

quorum disk to operate, you must restart the cluster (refer to Section 4.1, “Starting,

Stopping, and Deleting Clusters”).

Table 3.1. Quorum-Disk Parameters

Parameter Description

Do not use a

Quorum Partition

Disables quorum partition. Disables quorum-disk parameters in the

Quorum Partition tab.

Use a Quorum

Part it ion

Enables quorum partition. Enables quorum-disk parameters in the Quorum

Part it ion tab.

Int erval The frequency of read/write cycles, in seconds.

Votes The number of votes the quorum daemon advertises to CMAN when it has

a high enough score.

TKO The number of cycles a node must miss to be declared dead.

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.

Heuristics

Path to 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. T his field is

required.

Int erval — The frequency (in seconds) at which the heuristic is polled. The

default interval for every heuristic is 2 seconds.

Score — The weight of this heuristic. Be careful when determining scores

for heuristics. The default score for each heuristic is 1.

Apply Propagates the changes to the cluster configuration file

(/etc/cluster/cluster.conf) in each cluster node.

3.5. Configuring Fence Devices

Configuring fence devices consists of creating, modifying, and deleting fence devices. Creating a fence

device consists of selecting a fence device type and entering parameters for that fence device (for

Red Hat Enterprise Linux 4 Cluster Administration