"partprobe" and device mapper

[thomas.vonsteiger at bluewin.ch]

Hi,

Older Version of Linux without device mapper if i have a new partition i can
use "partprobe to update the partitions in /proc/partition without reboot.
Newer Versions of Linux like FC5 are using devicemapper. /dev/mapper/XXXX
can be used for vg or filesystem.
If I create a new partition on a disk how I can tell devicemapper from to
new partition without reboot ?
partprobe is not working for this. I need to sea all my new partition in
/dev/mapper 

regards
Thomas