Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Manual page 37

3. GULM tab (GULM clusters only) — This tab provides an interface for configuring GULM lock
servers. The tab indicates each node in a cluster that is configured as a GULM lock server and
provides the capability to change lock servers. Follow the rules provided at the tab for configuring
GULM lock servers and click Apply for changes to take effect.
Important
The number of nodes that can be configured as GULM lock servers is limited to either
one, three, or five.
4. Multicast tab (DLM clusters only) — This tab provides an interface for configuring these Multicast
Configuration parameters: Do not use multicast and Use multicast. Multicast Configuration
specifies whether a multicast address is used for cluster management communication among
cluster nodes. Do not use multicast is the default setting. To use a multicast address for cluster
management communication among cluster nodes, click Use multicast. When Use multicast
is selected, the Multicast address and Multicast network interface text boxes are enabled. If
Use multicast is selected, enter the multicast address into the Multicast address text box and
the multicast network interface into the Multicast network interface text box. Click Apply for
changes to take effect.
5. Quorum Partition tab (DLM clusters only) — 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.
describes the 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
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.
Table 3.1, "Quorum-Disk Parameters"
Clusters").
Global Cluster Properties
Section 4.1,
27