Some question about setting up RAC

Dear Group,

I have a few questions about linux(EL 3) when setting up RAC, hope
some linux expert here can help me out.

1) I did /etc/init.d/oracleasm createdisk VOL1 /dev/sdb1
then
oracleasm listdisk only gives me VOL1, how do I know this VOL1 is
associated with /dev/sdb1?

2)how do i know whether
raw /dev/raw/raw1 /dev/sdc1 been run or not?

in another words, can I get a list of raw device that has already been
bonded?

I got some errors during the CRS install, and how do I make sure the
raw device has been binded to the partition for Cluster registery or
voting disk, so I can rule out one possibility of mistake?

Thanks very much for your help.

.