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Access to HDD denied (Can't open /dev/sdb1 exclusively. Mounted filesystem?)

I have encountered a rather specific situation, but the resolution may help others.

We have Dell servers and use multipath as part of the standard build.  Strangely once multipath is enabled, the PERC controller would show up in the config.
So - I updated my blacklist in /etc/multipath.conf

 blacklist {
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^(hd|xvd|vd)[a-z]*"
        devnode "^asm/*"
        devnode "ofsctl"
           device {
        vendor "DELL"
        product "PERC*"
    }

}

followed by
# multipath -F

however, I would still get an error when I would attempt to create a pv on the new slice.

# pvcreate /dev/sdb1
Can't open /dev/sdb1 exclusively.  Mounted filesystem?


 

multipath -F
dmsetup remove /dev/mapper/sdb1



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