GuRT.Yuri337,   With budget in mind I would look at something like the MD1200 or MD1220, you can glance at the features and tech specs here. They are also compatible with the controller we discussed previously, and both are supported with the T320 as well. As far as the drives, I am not seeing them listed.      
I currently have a dell poweredge t320 running truenas for my at home business and file sharing storage server. I dont have anymore free ports available to add more hard drives. The t320 has a perc h710 sas controller connected to the front 3.5" drive bays and I replaced the 5.25" drive bays with 3.5" drive adapters. Is it even possible to connect the powervault md6610 to it? How would I connect it and wire it up? Thanks in advance! 
Connect a t320 running truenas and a powervault md6610?