Chapter 4. The DM-Multipath Configuration File
14
blacklist_exceptions {
device {
vendor "IBM"
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 /dev
# polling_interval 10
# selector "round-robin 0"
# path_grouping_policy multibus
# getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
# prio_callout /bin/true
# path_checker readsector0
# rr_min_io 100
# rr_weight priorities
# failback immediate
# no_path_retry fail
# user_friendly_name yes
#}
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.
