ASMlib cannot write disk label using EMC Powerpath to disk

We installed ASMlib on OEL5 (64-bit) update 1. We configured successfully. When we are cerating the disk label using EMC powerpath to disk, oracleasm createdisk command gives an error:
Device "/dev/emcpowerb1" is not a partition
If we access the device directly without multipathing (like /dev/sdd1), it works successfully. Is this a pwoerpath bug or are we doing something wrong?

Researched this a little deeper. Another Metalink Note:469163.1 "Oracleasm Createdisk Fails: Device '/dev/emcpoweraxx Is Not A Partition [Failed]" provides a different workaround to this situation:
1. Do the "/etc/init.d/oracleasm createdisk" operation using the "asmtool" command directly:
/usr/sbin/asmtool -C -l /dev/oracleasm -n <volume name> -s /dev/<emc device> -a force=yes
The tool will report:
asmtool: Device "/dev/<emc device>" is not a partition
asmtool: Continuing anyway
2. The permissions of the volume under /dev/oracleasm/disks/ will be "root: root"
Reboot the system to correct this.
3. Further use of the device can now be done normally using the powerpath device name
You may prefer this approach.
Cheers

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