Red Hat CLUSTER SUITE 4.7 DM MULTIPATH Configuration And Administration Manual page 19

\_ round-robin 0
\_ 2:0:0:1 sdc
\_ 3:0:0:1 sdg
create: 3600a0b80001327d800000070436216b3
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:2 sdd
\_ 3:0:0:2 sdh
create: 3600a0b80001327510000009b4362163e
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:3 sde
\_ 3:0:0:3 sdi
2. In order to prevent the device mapper from mapping /dev/sda in its multipath maps, edit
the devnode_blacklist section of the /etc/multipath.conf file to include this device.
Although you could blacklist the sda device using a devnode type, that would not be safe
procedure since /dev/sda is not guaranteed to be the same on reboot. To blacklist individual
devices, you can blacklist using the WWID of that device.
Note that in the output to the multipath -vs command, the WWID of the /dev/sda device is
SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1. To blacklist this device, include the
following in the /etc/multipath.conf file.
devnode_blacklist {
wwid SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1
}
3. Run the following commands:
multipath -F
multipath -v2
The local disk or disks should no longer be listed in the new multipath maps, as shown in the
following example.
[root@rh4cluster1 ~]# multipath -F
[root@rh4cluster1 ~]# multipath -v2
create: 3600a0b80001327d80000006d43621677
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:0 sdb
\_ 3:0:0:0 sdf
create: 3600a0b80001327510000009a436215ec
Ignoring Local Disks when Generating Multipath Devices
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