[CentOS] LVM not removing LV

I am using RHEL 5.1 with custom kernel.


I have a LV I am trying to remove and its keep complaining its open. I
have unmounted the filesystem, lsof shows nothing, fuser shows
nothing. I am certain a reboot will fix it, but I don't know why this
occurs. Can anyone shed some light on this?

Are there some other LVM hacks I can use for this?

TIA