I think that you are going at this the wrong way, but here goes.
729005-001 is the Service Processor. Primarily used for call home, notifications and upgrades. A virtual appliance exists, so if you have a VMware or Hyper-V environmemt you really don’t need this hardware.
1. see sticky thread in this forum. Most documentation is available at
www.hpe.com/support/hpesc/ and search for 3par 7200.
2. 3PAR systems need 3PAR branded drives. Those are 520byte sectors and hold a special firmware available in the 3PAR OS code. I think the biggest drives you can get for SSF 7000 slots is 3.84TB SSDs… only SAS supported (as dual port is required). Google 3PAR 7000 quickspecs
3. 7200 with somewhat recent code (post-2013) supports 9 cages in addition to node cage. Google 3PAR 7000 quickspecs
4. Google 3PAR 7000 quickspecs
5. As everything it depends on configuration. You can saturate the system with a very low number of SSDs, but you can max the system with NL drives and never come near.
6. It’s enterprise storage… most people buy this with 5+years expected service…… The 7200 launched in late 2012, its replacement (3PAR 8000) launched in 2015 and HPE is ending its mainstream support services for the 7000 systems late this year.