Configuration File Blacklist; Blacklisting By Wwid - Red Hat DEVICE-MAPPER MULTIPATH 5.2 Configuration And Administration Manual

Chapter 4. The DM-Multipath Configuration File
General default settings for DM-Multipath.
multipaths
Settings for the characteristics of individual multipath devices. These values overwrite what
is specified in the
devices
Settings for the individual storage controllers. These values overwrite what is specified in
the section of the configuration file. If you are using a storage array that is not
defaults
supported by default, you may need to create a
When the system determines the attributes of a multipath device, first it checks the multipath
settings, then the per devices settings, then the multipath system defaults.

2. Configuration File Blacklist

The section of the multipath configuration file specifies the devices that will not be
blacklist
used when the system configures multipath devices. Devices that are blacklisted will not be
grouped into a multipath device.
By default, all devices are blacklisted, since the following lines appear in the initial configuration
file.
blacklist {
devnode "*"
}
To enable multipathing on all of the devices that are supported by default, comment out those
lines, as described in Section 1, "Setting Up
After commenting out the universal blacklist, you can specify general device types and
individual devices to blacklist. You can blacklist devices according to the following criteria:
• By WWID, as described in
• By device name, as described in
• By device type, as described in
By default, a variety of device types are blacklisted, even after you comment out the initial
blacklist section of the configuration file. For information, see
Device Name".

2.1. Blacklisting by WWID

You can specify individual devices to blacklist by their World-Wide IDentification with a
18
and
defaults devices
Section 2.1, "Blacklisting by WWID"
Section 2.2, "Blacklisting By Device Name"
Section 2.3, "Blacklisting By Device Type"
sections of the configuration file.
subsection for your array.
devices
DM-Multipath".
Section 2.2, "Blacklisting By
wwid