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=====dm-multipath.conf=====
The multipath.conf files blacklists **EVERYTHING** by default. So ensure the first lines are commented out

<file>
blacklist {
        devnode "*"
}
</file>

After commenting out the general blacklist you can then specify general types of devices to black list or even individual devices.

This can be done in 3 ways:

**Using WWID**
This blocks the device with wwid = 99999999999999999
<file>
blacklist {
       wwid 99999999999999999
}
</file>
**Using Device nodes**
You can also block out all devices of certain types for example:
Blocking all SCSI devices:
<file>
blacklist {
       devnode "^sd[a-z]"
}
</file>

**Using Device Types**
The following example blacklists all IBM DS4200 device and all HP devices.
<file>
blacklist {
       device {
               vendor  "IBM"
               product "3S42"       #DS4200 Product 10
       }
       device {
               vendor  "HP"
               product "*"
       }
}
</file>