Linux RedHat 4 update 4: how to unbind  raw devices used by ASM diskgroups?

How to unbind raw devices used by ASM diskgroup?
I created ASM diskgroup using /dev/raw/rawn, after done my testing, I need to toss the raw devices to start a new testing. Here is the procedure:
1. shutdown MYTEST database
2. in ASM instance, remove disks from diskgroup 'rawtest'
3. in ASM instance, "drop diskgroup rawtest including contents"
4. in OS, issue: "raw /dev/raw/raw1 0 0"
I got the following error:
# raw /dev/raw/raw1 0 0
Error setting raw device (Device or resource busy)
But if I shutdown ASM instance, the above commmand will be successful.
My question, how can I unbind raw devices without shutting down ASM instance(could be used by other databases at the same time)?
Thanks,
Jenny

The installation guild will probably be were you will want to start.
2.11 Preparing Disk Groups for an Automatic Storage Management Installation
http://download.oracle.com/docs/cd/B19306_01/install.102/b15660/pre_install.htm#sthref457
Specifically
2.12 Configuring Raw Partitions or Raw Logical Volumes
http://download.oracle.com/docs/cd/B19306_01/install.102/b15660/pre_install.htm#sthref591

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