Sorry, I see your real question ... you currently have a SAS drive and would like to add a SATA drive.  The docs for the SAS 6/iR only indicate that SAS and SATA cannot be mixed within the same Virtual Disk (array), leaving open the possibility that they can be mixed on the controller.

Do you want/need to add them to another controller?  The SAS 6/iR will probably support 4 drives as shipped in RAID 1's or RAID 0.

I intended to attach the SATA drives to a different/additional controller.

If you have a backplane in the system, then this wouldn't be possible as there would only be one connection going out of the backplane into your SAS 6/iR and all drives would be attached to that.

If they are just cabled drives, the hardest part would be finding an additional controller that would be work properly. I would look for a SATA controller with a LSI chipset.

If you have a backplane in the system, then this wouldn't be possible as there would only be one connection going out of the backplane into your SAS 6/iR and all drives would be attached to that. If they are just cabled drives, the hardest part would be finding an additional controller that would be work properly. I would look for a SATA controller with a LSI chipset.