Installation guide

For more detailed information, refer to the qdisk man page.

If device mapper multipath is used together with qdiskd, the values for tko and interval must

be carefully considered. In the example case of a path failover, all storage I/O will be queued

by the device mapper module. The qdisk timeout must be adapted to the possible device

mapper's queuing time.

5.5.3 Fencing

The fencing configuration consists of two parts. The first is the configuration of the fencing

daemon (fenced) itself. The second is the configuration of the fencing agents that the daemon

will use to fence each cluster node.

The fencing daemon is configured by adding the <fence_daemon> tag within the cluster

configuration file. The following attributes should be considered:

Attribute Description

post_join_delay Post-join delay is the number of seconds the

daemon will wait before fencing any victims after a

node joins the domain.

post_fail_delay Post-fail delay is the number of seconds the

daemon will wait before fencing any victims after a

domain member fails.

clean_start Clean-start is used to prevent any startup fencing

the daemon might do. It indicates that the daemon

should assume all nodes are in a clean state to

start.

The fencing agents used for each cluster node must be configured within the <fencedevices>

tag. For each fence agent, a <fencedevice> tag within the <fencedevices> tag must be

defined. The <fencedevice> tag should at minimum define the agent and name attributes. For

further information about the different configuration options of all fencing agents, reference

the man pages of the desired fencing agent.

5.5.4 Cluster Nodes

The configuration of the cluster nodes is controlled by <clusternode> tags within an

encapsulating <clusternodes> tag.

The basic cluster node configuration should contain at least the following attributes:

Attribute Description

name The name of the host

nodeid The id of the cluster node

votes The number of quorum votes for this node

Within the <clusternode> tag, the methods used to fence the node must be defined. All