Hello, jindrax. So, I'm not saying it's impossible, however it will definitely get tricky. The PV220s works with a PERC 3 or PERC 4, which is NOT validated on the PE2950. The PE2950 is about the time we started switching over to SAS, if I recall correctly. So it'll be difficult at best to find a card for connecting the PV220s.  Aside from that, using the PV220s with Windows 2012 isn't a good idea either. While windows may have a random driver for it, it won't match the firmware, and will cause it to act 'funky' to say the least.  In this case, honestly you'd be better suited to find a large (4TB) USB drive, and be in a much better position than trying to mesh the older technology to today's. 
Hi, This PE2950 originally didn't come with extra PERC card. If I want to add in the extra PERC card to connect to PV220s, is it possible to do that?
PowerEdge 2950-additional PERC card to connect to PowerVault 220S