Configuration File Defaults - Red Hat ENTERPRISE LINUX 5 DM MULTIPATH Configuration And Administration Manual

Chapter 4. The DM-Multipath Configuration File
blacklist_exceptions {
device {
vendor
product "S/390.*"
}
}
When specifying devices in the blacklist_exceptions section of the configuration file, you must
specify the exceptions in the same way they were specified in the blacklist. For example, a WWID
exception will not apply to devices specified by a devnode blacklist entry, even if the blacklisted
device is associated with that WWID. Similarly, devnode exceptions apply only to devnode entries,
and device exceptions apply only to device entries.

4.3. Configuration File Defaults

The /etc/multipath.conf configuration file includes a defaults section that sets the
user_friendly_names parameter to yes, as follows.
defaults {
user_friendly_names yes
}
This overwrites the default value of the user_friendly_names parameter.
The configuration file includes a template of configuration defaults. This section is commented out, as
follows.
#defaults {
# udev_dir
# polling_interval
# selector
# path_grouping_policy
# getuid_callout
# prio_callout
# path_checker
# rr_min_io
# max_fds
# rr_weight
# failback
# no_path_retry
# user_friendly_names
#}
To overwrite the default value for any of the configuration parameters, you can copy the relevant
line from this template into the defaults section and uncomment it. For example, to overwrite
the path_grouping_policy parameter so that it is multibus rather than the default value
of failover, copy the appropriate line from the template to the initial defaults section of the
configuration file, and uncomment it, as follows.
14
"IBM"
/dev
10
"round-robin 0"
multibus
"/sbin/scsi_id -g -u -s /block/%n"
/bin/true
readsector0
100
8192
priorities
immediate
fail
yes