Hello Amr, at this link you will find the metrics for GDP https://www.ibm.com/support/customer/csol/terms/?ref=L-GFWS-T7ET8L-01-09-2025-zz-en
If you are going to use the Guardium Data Protection Stand-alone SW and Appliance Parts you need to count the number of MVS (Managed Virtual Servers) which are then converted the Resource Value Units. The conversion table you can find at above link. If you need more guidance, please reach out to your IBM Tech Sales or Sales Representative. They will be able to give you the exact numbers you need.
Hope this helps,
Erwin