Unable to create vmfs partition using vmkfstool command

Hi All,

I am playing with vmware ESX 4.1 with openfiler, I have created LUNs in openfiler and mapped to targets. I see those LUNs in vmware s/w iscsi initiator and create vmfs partition through vSphere Client but I am unable to create the same drive using vmkfstool command.

Below is the command line output.

[root@localhost disks]# vmkfstools  -C vmfs -S test1 /vmfs/devices/disks/vml.01000000004a4d346139302d6d48627a2d6e425272564952545541
Checking if remote hosts are using this device as a valid file system. This may take a few seconds...
Creating vmfs file system on "t10.F405E46494C45400A4D443169303D2D68426A7D2E6242527" with blockSize 1048576 and volume label "test1".
/vmfs/devices/disks/vml.01000000004a4d346139302d6d48627a2d6e425272564952545541: Permission denied.  (Have you set the partition type to 0xfb?)
Error: Permission denied.

Please help me to over come this issue.

Thanks in advance,