Intel 273561-003 manual Supported Hard Drive Technology, Supported Scsi Device Standards

Hardware Specifications and Features

The SRCMRU firmware supports the following SCSI controllers on the motherboard:

•SCSI Ultra160

—Adaptec* AIC-7899x dual-channel Ultra160 SCSI controller

—Adaptec AIC-7892x single-channel Ultra160 SCSI controller

•SCSI Ultra320

—Adaptec AIC-7901 single-channel Ultra320 SCSI controller

—Adaptec AIC-7902 dual-channel Ultra320 SCSI controller

3.3.1Supported Hard Drive Technology

The IIR controller supports both Single-ended (SE) and Low Voltage Differential (LVD) devices but it is recommended that you use only one type of drive technology (SE or LVD) on any one channel at a time.

The IIR controller supports single-ended drives which operate at up to 40MB/sec depending upon the speed of the drives attached.

The IIR controller supports Ultra-2 LVD SCSI devices operating at up to 80MB/sec, Ultra160 LVD SCSI devices operating at up to 160MB/sec, and Ultra320 LVD SCSI devices operating at up to 320MB/sec.

Note: If both SE and LVD devices are attached to the same channel/bus, the entire bus will operate at the single ended speed of the slowest device. See Table 3-4for the maximum cable length distances that apply to each mode.

The IIR controller is designed to use an Ultra160 or Ultra320 SCSI controller implementation on the motherboard and is backward compatible with older SCSI hard drive specifications. See Table 3-4for the SCSI standards supported.

Table 3-4. Supported SCSI Device Standards

				Maximum Cable
	SCSI Drive	Speed	Bus Width	Length (meters) (1)		Adapter Maximum
	Standard	(MB/Sec)	(Bits)	Single-		Devices per SCSI
					LVD	Channel
				Ended
	SCSI-1 (2)	5	8	6	(3)	8
	Fast SCSI (2)	10	8	3	(3)	8
	Fast Wide SCSI	20	16	3	(3)	16
	Ultra SCSI (2)	20	8	1.5	(3)	8
	Ultra SCSI (2)	20	8	3	N/A	4
	Wide Ultra SCSI	40	16	N/A	(3)	16
	Wide Ultra SCSI	40	16	1.5	N/A	8
	Wide Ultra SCSI	40	16	3	N/A	4
	Ultra 2 SCSI (2, 4)	40	8	(4)	12	8
Hardware Installation and User’s Guide						19