ASM shared devices

Hello,

Here is what I am trying to do.

two servers: Let's call A and B in short ASMLib 1.0 installed and configured on server A and B two shared raw devices /dev/sde and /dev/sdf

*Server A*
create 1 partition on each of them, /dev/sde1 and /dev/sdf1, using fdisk command
/etc/init.d/oracleasm createdisk VOL1 /dev/sde1
/etc/init.d/oracleasm createdisk VOL2 /dev/sdf1
/etc/init.d/oracleasm listdisks (shows VOL1 and VOL2)
run dbca to configure ASM: DATA_1 --> VOL1 and DATA_2 --> VOL2

*Server B*
use sfidk -R to create 1 partition on /dev/sde and /devsdf
/etc/init.d/oracleasm scandisks <---- want to give server B a notice of
VOL1 and VOL2 ASM diskgroups
/etc/init.d/oracleasm listdisks <----- show nothing ????
run dbca to configure ASM: <--- can't see any asn disk group(s)

Does anyone can point it out to the missing/wrong procedure of the above configuration?

If I use /etc/init.d/oracleasm createdisk VOL1 /dev/sde1 on Server B, I can see the diskgroup while configuring ASM, but I got,

ora-15003, Disk Group DATA_1 already mounted in another lock name space

Does anyone have any idea of how to make that working? Many thanks for all the help.
Cindy

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