Hello Graham, Maximum number of virtual disks 2 as reference pg16 [URL]   I've checked NP390 cable but I couldn't see it properly actually I'm not sure about it. for D385M cable seems like that "PERC6i/SAS Controller Cable for Cable HDD Config,T310"
I bought a pe t300 today. It has a sas6ir. I have 1x500gb sata drive plus 3x2tb sas drives. With just the sas drives in i can only select one drive for r0 the others are greyed. As far as i know the hdds are good. Is it possible to configure this with either all 4 drives or 3 x sas or am i stuck with one drive. I have a spare sas6ir cable which came out of a t105 if i can use that  Regards Graham  
T300 and sas6ir storage limits