I have already 8 drives hooked up the the P800 RAID controller internally. I would like to attach 8 more SATA drives externally. I looked in the documentation but the only thing mentioned for the external ports is HP SAS to Mini Cables
with different length options.
The question is:
Certainly you need it to be one of the HP disk enclosures yes but the P800 supports the MSA 50, 60 & 70.