Installation guide

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. T he Post -
Fail Delay default value is 0. Its value may be varied to suit cluster and network performance.
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. T he 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.
Enter values required and Click Apply for changes to take effect.
Note
For more information about Post-Join Delay and Post -Fail Delay, refer to the fenced(8)
man page.
3. GULM tab (GULM clusters only) — T his 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) — T his tab provides an interface for configuring these
Multicast Configuration parameters: Do not use multicast and Use multicast. Multicast
Configurat ion specifies whether a multicast address is used for cluster management
communication among cluster nodes. Do not use multicast is the default setting. T o 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
int erface 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
int erface text box. Click Apply for changes to take effect.
5. Quorum Partit ion tab (DLM clusters only) — T his tab provides an interface for configuring these
Quorum Partition Configuration parameters: Do not use a Quorum Partit ion, Use a
Quorum Partition, Interval, Votes, TKO, Minimum Score, Device, Label, and Heuristics.
The Do not use a Quorum Part it ion parameter is enabled by default. Table 3.1, “Quorum-Disk
Parameters” describes the parameters. If you need to use a quorum disk, click Use a Quorum
Part it ion, 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. T o 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.
Chapter 3. Configuring Red Hat Cluster With Conga
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