ORA-15130: diskgroup "string" is being dismounted
Cause : The diskgroup is being dismounted by request or because an I/O error was encountered that could not be handled by taking the disks offline. A disk cannot be offlined whenever doing so could result in all copies of a redundant extent being unavailable.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Repair the hardware problem and re-mount the diskgroup. Refer to the alert log to determine which disks have failed.
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.