Red Hat ENTERPRISE LINUX 5.1 DM MULTIPATH Configuration And Administration Manual page 19

[size=12 GB][features="0"][hwhandler="0"]
\_ 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
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.
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
Ignoring Local Disks when Generating Multipath Devices
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