Configuring Fence Devices - Red Hat ENTERPRISE LINUX 5 - ADMINISTRATION Manual

Chapter 3. Configuring Red Hat Cluster With Conga
Parameter
TKO
Minimum Score
Device
Label
Heuristics
Apply
Table 3.1. Quorum-Disk Parameters

3.5. Configuring Fence Devices

Configuring fence devices consists of creating, modifying, and deleting fence devices. Creating a
fence device consists of selecting a fence device type and entering parameters for that fence device
(for example, name, IP address, login, and password). Modifying a fence device consists of selecting
an existing fence device and changing parameters for that fence device. Deleting a fence device
consists of selecting an existing fence device and deleting it.
Note
If you are creating a new cluster, you can create fence devices when you configure cluster
nodes. Refer to
With Conga you can create shared and non-shared fence devices.
The following shared fence devices are available:
• APC Power Switch
• Brocade Fabric Switch
• Bull PAP
28
Description
The number of cycles a node must miss to be declared dead.
The minimum score for a node to be considered "alive". If omitted or set
to 0, the default function, floor((n+1)/2), is used, where n is the sum
of the heuristics scores. The Minimum Score value must never exceed
the sum of the heuristic scores; otherwise, the quorum disk cannot be
available.
The storage device the quorum daemon uses. The device must be the
same on all nodes.
Specifies the quorum disk label created by the mkqdisk utility. If this field
contains an entry, the label overrides the Device field. If this field is used,
the quorum daemon reads /proc/partitions and checks for qdisk
signatures on every block device found, comparing the label against the
specified label. This is useful in configurations where the quorum device
name differs among nodes.
Path to Program — The program used to determine if this heuristic is
alive. This can be anything that can be executed by /bin/sh -c. A return
value of 0 indicates success; anything else indicates failure. This field is
required.
Interval — The frequency (in seconds) at which the heuristic is polled. The
default interval for every heuristic is 2 seconds.
Score — The weight of this heuristic. Be careful when determining scores
for heuristics. The default score for each heuristic is 1.
Propagates the changes to the cluster configuration file (/etc/cluster/
cluster.conf) in each cluster node.
Section 3.6, "Configuring Cluster Members".