Comment 3 for bug 1468897

This is a problem that comes from USB and (S)ATA devices showing up as SCSI disks and the default multipath not really expecting those mixed environments. The best way to handle this is to add blacklisting in /etc/multipath.conf and the most flexible seems to key on vendor/product like this:

blacklist {
        device {
                vendor "*"
                product "*"
        }
}
blacklist_exceptions {
        device {
                vendor "IBM"
                product "*"
        }
}

Possibly with a bit more detail in the exceptions allowing only certain models or so...