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Table 6.
SCSI Drive Standards
SCSI Drive
Standard
SCSI-1
(2)
Fast SCSI
(2)
Fast Wide SCSI
Ultra SCSI
(2)
Ultra SCSI
(2)
Wide Ultra SCSI
Wide Ultra SCSI
Wide Ultra SCSI
Ultra2 SCSI
(2, 4)
Wide Ultra2
(4)
Ultra160 (Ultra3)
Notes:
1. May be exceeded in Point-to-Point and engineered specific applications.
2. Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2 SCSI (for example, Narrow SCSI) is optional.
3. LVD was not defined in the original SCSI standards for this speed. If all devices on the bus support LVD, then
12-meters operation is possible at this speed. However, if any device on the bus is singled-ended only, then the
entire bus switches to single-ended mode and the distances in the single-ended column apply.
4. Single-ended is not defined for speeds beyond Ultra.
After Ultra2 all new speeds are wide only.
Support for Non-Hard-Disk-Drive SCSI Devices (Non-Direct-
Access Devices)
The RAID controller will pass through to the host operating system direct access to nondirect-
access SCSI devices that are connected to a SCSI bus (channel) of the RAID controller. The RAID
controller passes through all control of these devices to the host operating system.
Types of supported non-Direct-Access SCSI devices (this does not cover specific vendors and
models):
SAF-TE Processors
Tape Devices
CD-ROMs
Getting Started
Speed
Bus Width
Maximum Cable Length (meters)
(MB/Sec)
(Bits)
Single-Ended
5
8
6
10
8
3
20
16
3
20
8
1.5
20
8
3
40
16
N/A
40
16
1.5
40
16
3
40
8
(4)
80
16
(4)
160
16
(4)
Adapter Maximum
(1)
Devices per SCSI Channel
LVD
8
(3)
8
(3)
16
(3)
8
(3)
N/A
4
16
(3)
N/A
8
N/A
4
12
8
12
16
12
16
29
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