Upgrade Symantec Netbackup Puredisk (PDDO) 6.6 to Symantec Netbackup 7.5

Hi All,

Can you give me how to 'Upgrade Symantec Netbackup Puredisk (PDDO) 6.6 to Symantec Netbackup 7.5 ?

This is existing environment :

Puredisk Server version : 6.6 (bundle with Suse Enterprise)

Platform : Suse Enterprise Linux 10 

Storagepool : 4 TB (/Storage/data)

I need this solution because netbackup versin 6.x end off support from symantec :

http://www.symantec.com/connect/blogs/be-aware-netbackup-6x-end-support-life-fast-approaching

Thanks in advance.

Regards,

Ahmad