Red Hat DEVICE-MAPPER MULTIPATH 5.2, Configuration And Administration Manual

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\_ round-robin 0
\_ 0:0:0:0 sda 8:0 [---------
device-mapper ioctl cmd 9 failed: Invalid argument
device-mapper ioctl cmd 14 failed: No such device or address
create: 3600a0b80001327d80000006d43621677
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:0 sdb 8:16
\_ 3:0:0:0 sdf 8:80
create: 3600a0b80001327510000009a436215ec
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:1 sdc 8:32
\_ 3:0:0:1 sdg 8:96
create: 3600a0b80001327d800000070436216b3
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:2 sdd 8:48
\_ 3:0:0:2 sdh 8:112
create: 3600a0b80001327510000009b4362163e
[size=12 GB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 2:0:0:3 sde 8:64
\_ 3:0:0:3 sdi 8:128
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
Ignoring Local Disks when Generating
13