What shelf and controllers do you have?
Ideally, you'd want an IOM3, IOM6, or IOM12 depending on your shelf. NetApp also made some controllers that run an actual OS that can slot in there too, you do not want one of those if you intend to just use it as a JBOD.
If you have (or get) an IOM3 or IOM6, you need a QSFP+ (SFF-8436) to whatever SAS your HBA/RAID card has on it. I haven't had any experience with the IOM12 so not sure what they use.