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:
blacklist {
devnode “^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*”
devnode “^hd[a-z]”
devnode “^sda”
devnode “^sda[0-9]”
devnode “^sdb”
devnode “^sdb[0-9]”
wwid “36001e4f034bf55000f98fe8606dc88df”
device {
vendor DELL
product “PERC|Universal|Virtual”
}
}
This will now prevent the multipath driver from attempting to manage /dev/sdc.