dmraid 1.0.0rc5/6 and device-mapper: Cannot get geometry

["Koerner, Sebastian" <koerner@xxxxxxxxxxxx>]

Is the device-mapper system regarded "fully functional" on Kernel 2.6.8?
I have a Stripe-Set on ICH5R that is activated with dmraid (1.0.0-rc6).
I created several partitions there. I could format the 40GB ext3 Partition 
but mkfs.dosfs -F32 /dev/mapper/isw....1 gave me a message like "cannot 
get geometry" on a 2GB and a 40GB Partition.

Sebastian Koerner