3ware 9690SA model RAID controllers have the following requirements:
The 3ware 9690SA RAID controller may be connected to up to 128 SAS and/or SATA drives. If all drives are SAS drives and connections are made to both ports of each SAS drive from the controller (for redundancy and performance), then a maximum of 64 drives may be used. A maximum of 32 drives are allowed per RAID unit and up to 32 active RAID units per controller. You cannot mix SAS and SATA drives in the same unit.
Drives and drive enclosures must meet SAS (3.0 Gbps) and SATA (1.5 or 3.0 Gbps) standards.
Note: SAFTE (SCSI Accessed Fault Tolerant Enclosure) is not supported at this time.