What HBAs have you used? I'm designing SOFS powered by refurbished Dell hardware, so I'm not sure whether go with stock LSI 9200-8e or look for some Dell branded HBA ("Dell SAS 6Gb/s HBA" or h200e). Some have reported that third-party SAS adapters do not work with newer (11+) generation Dell servers, so any information will be useful — I had no experience with branded servers at all.
P. S. By the way, you are running HP hardware, aren't you? How are their d2600/d2700 JBODs? They're much cheaper than Dell ones, but Dells are certified by MS... Tough choice.
I purchased some dell branded 9300-8e HBAs off of eBay and the shipper decided to ship them in the worst packaging possible (soft bubble envelope with static inducing bubble wrap). None of the HBAs are working properly (they either don't boot or they lock up after getting to the installation screen of an operating system), so I'm in the process of getting a refund.
The experimental Ceph cluster I'm building will consist of the following hardware:
Dell C6100 with 4 x nodes
2 x L5520 cpus per node
24GB ram per node
Dell 10Gbit mezzanine NIC
some sort of boot drive and 2 x SSDs per node
LSI 9200-8e HBA for the SAS drives
HP D2700 DAS chassis
25 x Hitachi UltraStar C10K600 drives per chassis
All connected to a Cisco Nexus 5020P 10Gbit switch