Installation guide

min _sco re The minimum score for a node to be considered " alive". If omitted or set to

0, the default function, flo o r((n+ 1)/2), is used, where n is the sum of

the heuristics scores. The Min imum Sco re value must never exceed the

sum of the heuristic scores; otherwise, the quorum disk cannot be

available.

d evice The storage device the quorum daemon uses. The device must be the

same on all nodes.

lab el Specifies the quorum disk label created by the mkq d i sk utility. If this field

contains an entry, the label overrides the Device field. If this field is used,

the quorum daemon reads /pro c/parti ti o ns 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.

Paramet er Descrip t io n

Use the following command to configure the heuristics for a quorum disk:

ccs -h host --addheuristic [heuristic options]

Table 5.2, “ Quorum Disk Heuristics” summarizes the meaning of the quorum disk heuristics you may

need to set.

T ab le 5.2. Q u o ru m Disk Heu rist ics

Paramet er Descrip t io n

p ro g ram The path to the program used to determine if this heuristic is available.

This can be anything that can be executed by /bi n/sh -c. A return

value of 0 indicates success; anything else indicates failure. This

parameter is required to use a quorum disk.

in t erval The frequency (in seconds) at which the heuristic is polled. The default

interval for every heuristic is 2 seconds.

sco re The weight of this heuristic. Be careful when determining scores for

heuristics. The default score for each heuristic is 1.

t ko The number of consecutive failures required before this heuristic is

declared unavailable.

To see a list of the quorum disk options and heuristics that are configured on a system, you can

execute the following command:

ccs -h host --lsquorum

To remove a heuristic specified by a heuristic option, you can execute the following command:

ccs -h host rmheuristic [heuristic options]

Note that 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” .

Red Hat Ent erprise Linux 6 Clust er Administ rat ion