Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Przewodnik Instalacji Pobierz pdf (Strona 26)

Chapter 4. The DM-Multipath Configuration File

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

# max_fds 8192

# rr_weight priorities

# failback immediate

# no_path_retry fail

# user_friendly_names 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.

defaults {

user_friendly_names yes

path_grouping_policy multibus

}

Table 4.1, “Multipath Configuration Defaults” describes the attributes that are set in the defaults

section of the multipath.conf configuration file. These values are used by DM-Multipath unless

they are overwritten by the attributes specified in the devices and multipaths sections of the

multipath.conf file.

Table 4.1. Multipath Configuration Defaults

Attribute Description

udev_dir Specifies the directory where udev device nodes are created. The

default value is /udev.

verbosity (Red Hat Enterprise Linux 5.3 and later) Specifies the verbosity

level of the command. It can be overridden by the -v command

line option. The default value is 2.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 43 44

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