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Hardware Installation and User’s Guide 19
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
3.3.1 Supported 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 3-4 for 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 3-4 for the SCSI standards supported.
Table 3-4. Supported SCSI Device Standards
SCSI Drive
Standard
Speed
(MB/Sec)
Bus Width
(Bits)
Maximum Cable
Length (meters)
(1)
Adapter Maximum
Devices per SCSI
Channel
Single-
Ended
LVD
SCSI-1
(2)
586
(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