Dismantling HP VLS9000 - how to clear netbackup

Hello,

I dismantled an old VL9000 and I would like to remove everything about this hardware from netbackup. 

All virtual tapes are in the scratch volume pool (no more used data on the VLS), several mediaservers was using the VLS and everything are still configured on the netbackup side. I dont know what are the steps to dismantle properly everything.

Thanks in advance for your help.

Regards