Multipaths Device Configuration Attributes - Red Hat ENTERPRISE LINUX 5.1 DM MULTIPATH Configuration And Administration Manual

Chapter 4. The DM-Multipath Configuration File
Attribute
failback
no_path_retry
user_friendly_names
Table 4.1. Multipath Configuration Defaults

4.4. Multipaths Device Configuration Attributes

Table 4.2, "Multipath Attributes"
the multipath.conf configuration file for each specific multipath device. These attributes apply only
to the one specified multipath. These defaults are used by DM-Multipath and override attributes set in
the defaults and devices sections of the multipath.conf file.
Attribute
wwid
alias
path_grouping_policy
16
Description
If set to uniform, all path weights are equal. The default value is
uniform.
Specifies path group failback.
A value of 0 or immediate specifies that as soon as there is a
path group whith a higher priority than the current path group the
system switches to that path group.
A numeric value greater than zero specifies deferred failback,
expressed in seconds.
A value of manual specifies that failback can happen only with
operator intervention.
The default value is immediate.
A numeric value for this attribute specifies the number of times
the system should attempt to use a failed path before disabling
queueing.
A value of fail indicates immediate failure, without queuing.
A value of queue indicates that queuing should not stop until the
path is fixed.
The default value is (null).
If set to yes, specifies that the system should using the bindings
file /var/lib/multipath/bindings to assign a persistent
and unique alias to the multipath, in the form of mpathn. If set to
no, specifies that the system should use use the WWID as the
alias for the multipath. In either case, what is specified here will
be overriden by any device-specific aliases you specify in the
multipaths section of the configuration file. The default value is
no.
shows the attributes that you can set in the multipaths section of
Description
Specifies the WWID of the multipath device to which the
multipath attributes apply.
Specifies the symbolic name for the multipath device to which the
multipath attributes apply.
Specifies the default path grouping policy to apply to unspecified
multipaths. Possible values include:
failover = 1 path per priority group
multibus = all valid paths in 1 priority group
group_by_serial = 1 priority group per detected serial number
group_by_prio = 1 priority group per path priority value
group_by_node_name = 1 priority group per target node name