ORA-15031: disk specification 'string' matches no disks
Cause : The device specification string to a CREATE DISKGROUP command did not match any devices which could be discovered.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check the device specification string matches a disk on the system.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.