Hello db   Yes, you can run both backplanes from a single PERC. The backplane has an expansion controller with connections so that you can attach another backplane to it. Instead of cabling a second PERC to SASA/B on the second backplane you would cable the first backplane's expansion connections to SASA/B on the second backplane. The biggest difference would be price versus performance. There is an upfront price difference between the two in the additional cost for a second PERC. There is also an ongoing cost for additional power use and heat generation by the additional PERC. This would be nominal for a couple of servers, but in a full rack or datacenter this could be a very expensive difference in utility bills. There are other differences related to power and PCI slot availability which might determine what option would be best for you as well. There is also increased reliability with a second PERC. In a single PERC configuration the second backplane would go offline if the first backplane fails since the first backplane is required to communicate with the second. In a dual PERC configuration the second backplane would run independent of the first. I would suggest that you talk with a technical sales representative if you want assistance planning out the right solution for your needs. Thanks
I see in the quoting tool that I can have 16+16 2.5" drives with dual PERC 710p's or I can do a 32x 2.5" configuration with a single PERC 310 or 710.   Can someone confirm that I can run the 32x 2.5" with a single perc in the T620? Also what would be the pro's and con's of each?  Thank you db
T620 with 16+16 OR 32 2.5" drives