Installation guide

</fencedevices>

<rm>

</rm>

</cluster>

When you add a node to the cluster, you can specify the number of votes the node

contributes to determine whether there is a quorum. To set the number of votes for a cluster

node, use the following command:

ccs -h host --addnode host --votes votes

When you add a node, the ccs assigns the node a unique integer that is used as the node

identifier. If you want to specify the node identifier manually when creating a node, use the

following command:

ccs -h host --addnode host --nodeid nodeid

To remove a node from a cluster, execute the following command:

ccs -h host --rmnode node

When you have finished configuring all of the components of your cluster, you will need to sync the

cluster configuration file to all of the nodes, as described in Section 5.15, “Propagating the

Configuration File to the Cluster Nodes” .

5.5. Configuring Fence Devices

Configuring fence devices consists of creating, updating, and deleting fence devices for the cluster.

You must create and name the fence devices in a cluster before you can configure fencing for the

nodes in the cluster. For information on configuring fencing for the individual nodes in the cluster,

refer to Section 5.7, “Configuring Fencing for Cluster Members”.

Before configuring your fence devices, you may want to modify some of the fence daemon properties

for your system from the default values. The values you configure for the fence daemon are general

values for the cluster. The general fencing properties for the cluster you may want to modify are

summarized as follows:

The po st_fai l _d el ay attribute 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. The

po st_fail _d el ay default value is 0 . Its value may be varied to suit cluster and network

performance.

The po st-jo i n_d el ay attribute is the number of seconds the fence daemon (fenced ) waits

before fencing a node after the node joins the fence domain. The po st_jo i n_d el ay default

value is 6 . A typical setting for post_jo i n_d el ay is between 20 and 30 seconds, but can vary

according to cluster and network performance.

You reset the values of the po st_fai l _d el ay and po st_jo i n_d el ay attributes with the --

setfenced aemo n option of the ccs command. Note, however, that executing the ccs --

setfenced aemo n command overwrites all existing fence daemon properties that have been

explicitly set and restores them to their default values.

⁠Chapt er 5. Configuring Red Hat Hig h Availabilit y Add- O n Wit h t he ccs Command