Configuration File Blacklist; Blacklisting By Wwid; Blacklisting By Device Name - Red Hat CLUSTER SUITE 4.7 DM MULTIPATH Configuration And Administration Manual

Chapter 4. The DM-Multipath Configuration File
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.

4.2. Configuration File Blacklist

The devnode_blacklist section of the multipath configuration file specifies the devices that will
not be 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.
devnode_blacklist {
devnode "*"
}
To enable multipathing on all of the devices that are supported by default, comment out those lines, as
Section 3.1, "Setting Up
described in
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 default, a variety of device types are blacklisted, even after you comment out the initial
devnode_blacklist section of the configuration file. For information, see
"Blacklisting By Device

4.2.1. Blacklisting by WWID

You can specify individual devices to blacklist by their World-Wide IDentification with a wwid entry in
the blacklist section of the configuration file.
The following example shows the lines in the configuration file that would blacklist a device with a
WWID of 26353900f02796769.
blacklist {
wwid 26353900f02796769
}

4.2.2. Blacklisting By Device Name

You can blacklist device types by device name so that they will not be grouped into a multipath device
by specifying a devnode entry in the devnode_blacklist section of the configuration file.
The following example shows the lines in the configuration file that would blacklist all SCSI devices,
since it blacklists are sd* devices.
12
DM-Multipath".
Section 4.2.1, "Blacklisting by WWID"
Section 4.2.2, "Blacklisting By Device Name"
Name".
Section 4.2.2,