All systems are VM under VMware Workstation 7.x.x

Scenario 1 :- RHEL 5.2

We are able to enumerate Device files of the newly added partitions(sdb2) provided sdb1 is currently mounted Courtesy PARTPROBE .
kpartx device mapping isn't persistent across reboots and furthermore KPARTX in our RHEL 5.2 setup required All child devices (sdb1 or minor numbers) of the Parent Device(sdb or major number) to be Unmounted in order to add mapping under /dev/mapper--- which is unlike PARTPROBE which works with mounted child devices.

Correct me if we are wrong regarding kpartx.


Scenario 2 : RHEL 6.0/6.1

PARTPROBE is not performing as in RHEL 5.2. We need to unmount all the Child Device Files in order to let PARTPROBE complete its job.
How to enumerate these newly added partitions on the fly on EL 6.0???

All above Filesystems are ext3.