Red Hat ENTERPRISE LINUX 5 - ADMINISTRATION Manual page 37

Note
The cluster ID is a unique identifier that cman generates for each cluster. To view the
cluster ID, run the cman_tool status command on a cluster node.
If you do specify a multicast address, you should use the 239.192.x.x series that cman uses.
Otherwise, using a multicast address outside that range may cause unpredictable results. For
example, using 224.0.0.x (which is "All hosts on the network") may not be routed correctly, or even
routed at all by some hardware.
Note
If you specify a multicast address, make sure that you check the configuration of
routers that cluster packets pass through. Some routers may take a long time to learn
addresses, seriously impacting cluster performance.
4. Quorum Partition tab — This tab provides an interface for configuring these Quorum Partition
Configuration parameters: Do not use a Quorum Partition, Use a Quorum Partition, Interval,
Votes, TKO, Minimum Score, Device, Label, and Heuristics. The Do not use a Quorum
Partition parameter is enabled by default.
parameters. If you need to use a quorum disk, click Use a Quorum Partition, enter quorum disk
parameters, click Apply, and restart the cluster for the changes to take effect.
Important
Quorum-disk parameters and heuristics depend on the site environment and the
special requirements needed. To understand the use of quorum-disk parameters and
heuristics, refer to the qdisk(5) man page. If you require assistance understanding and
using quorum disk, contact an authorized Red Hat support representative.
Note
Clicking Apply on the Quorum Partition 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
"Starting, Stopping, and Deleting
Parameter
Do not use a Quorum
Partition
Use a Quorum
Partition
Interval
Votes
Table 3.1, "Quorum-Disk Parameters"
Description
Disables quorum partition. Disables quorum-disk parameters in the
Quorum Partition tab.
Enables quorum partition. Enables quorum-disk parameters in the
Quorum Partition tab.
The frequency of read/write cycles, in seconds.
The number of votes the quorum daemon advertises to CMAN when it has
a high enough score.
Clusters").
Global Cluster Properties
describes the
Section 4.1,
27