For multipath drivers connecting to storage area networks (SAN), it is useful in your /etc/multipath.conf to blacklist devices. This prevents the multipath driver from attempting to use the device(s).
To find out a drive’s WWID, run the following command:
>scsi_id -g -u -s /block/sda
This will return a WWID. On my system it was returned as 36001e4f034bf55000f98fe8606dc88df.
Now you can put this in the blacklist section of /etc/multipath.conf as:
This will now prevent the multipath driver from attempting to manage /dev/sdc.