See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
o Linux kernel 2.6.0 with udm5 patchset
http://people.sistina.com/~thornber/dm/
+o udev
+ See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
How it works :
==============
When mp is filled, the device maps are fed to the kernel
through libdevmapper.
+The naming of the corresponding block device is handeld
+by udev with the help of the devmap_name proggy. It is
+called by the following rule in /etc/udev/udev.rules :
+KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \
+NAME="%k", SYMLINK="%c"
+
Notes :
=======