Hello,   Historically, SAS and NLSAS cannot coexist within the same RAID array. I haven't seen an indication that this generation of server would be different, but I haven't tried, either. As I understand it, an NLSAS drive is essentially a SATA drive with a SAS connector. My expectation is that this would not work. Let me know if you have additional questions, though.
I am buying a refurb r740xd that comes with ten 12TB NLSAS drives & PERC H740p controller, & I want to configure it in raid6. The various systems will be reading / writing to the server through 10G connection. Since enterprise SAS drives are easier to source, faster, & cheaper, I was thinking of replacing the NLSAS drives with enterprise SAS as they fail. Will this be possible? Or will the SAS drives have to be part of a separate disk group? Also, is it in general advisable to do this?
Mixing NLSAS and SAS on r740xd with PERC H740p