
8-2 SCSI and I/O
Configuration
1.
HP’s current implementations of SCSI supports 8 devices consisting of one or more device adapters
(Initiators) and up to 7 peripheral devices (Targets) on the 50 pin busses, and up to 16 Initiator or
Target devices on the 68 pin busses.
2.
All SCSI buses must be terminated at both ends with an appropriate 50 pin or 68 pin ACTIVE
terminator. (see the associated part number list).
3.
Single Ended vs. Differential
There are 2 structural alternatives available for host/device interconnect, each of which are mutually
exclusive within a system.
Single Ended - is a terminated bus which cannot exceed 6 meters including all internal and external
cabling. (50 Pin Bus, Internal = Flat Cable, External = High or Low density connector, shielded cable)
Differential - is a terminated bus which cannot exceed 25 meters including all internal and external
cabling. (68 Pin Bus, Internal = Flat Cable, External = High density connector, shielded cable)
4.
There must be at least one source of TERM POWER (usually host adapter supplied). It is acceptable
to have more than one source of TERM POWER on a SCSI bus. If 2 or more sources of TERM
POWER are available, the second source should be at the opposite end of the bus from the host
adapter.
5.
The first host adapter SCSI address on either internal bus should be set to 7.
6.
Priority is determined by SCSI address. Address 7 is the highest priority and address 0 is the lowest
on the 50 pin bus or address 8 on the 68 pin bus.
Highest (7,6,5,4,3,2,1,0,15,14,13,12,11,10,9,8) Lowest
7.
Parity on the SCSI bus is normally enabled by a jumper on the devices. All currently supported
system devices support parity generation. If any new device is added on a SCSI bus which does not
generate parity, all devices on that bus must be set to ignore parity or this device must be on it’s own
dedicated SCSI bus.
NOTE
Single Ended internal system length is 0.5 meters, external length maximum is 5.5 meters.
NOTE
Differential internal system length is 0.5 meters, external length maximum is 24.5 meters.
NOTE
Fast Wide SCSI disks internal in the system ALL provide TERM POWER to the SCSI bus.
Summary of Contents for 3000/9x9KS Series
Page 14: ...xiv Contents E Sources of Information on the Web ...
Page 28: ...2 8 Install and Configuration Figure 2 4 HP PB I O Slot Location Diagram Kx70 Kx80 ...
Page 44: ...2 24 Install and Configuration ...
Page 68: ...3 24 Troubleshooting HP 3000 Core I O Figure 3 4 HP 3000 Core I O ...
Page 120: ...5 6 Diagnostics ...
Page 128: ...6 8 Replaceable Parts Figure 6 4 Peripheral Bay Expanded View ...
Page 136: ...6 16 Replaceable Parts ...
Page 150: ...7 14 Removal and Replacement Figure 7 11 Peripheral Bay Rear View ...
Page 180: ...7 44 Removal and Replacement Figure 7 35 Cabinet Exploded View Rear ...
Page 209: ...SCSI and I O 8 21 Figure 8 3 A3629A ST19171WD J2 and J6 Jumper Settings ...
Page 217: ...SCSI and I O 8 29 Figure 8 7 A3353A source 2 J3 Jumper Positions ...
Page 218: ...8 30 SCSI and I O Figure 8 8 A3353A source 2 Option Connector Jumper Positions ...
Page 280: ...8 92 SCSI and I O Diagnostics CSTM SCSIDDS SYSMAP IOMAP ...
Page 298: ...8 110 SCSI and I O Diagnostics SCSICD IOMAP SYSMAP ...
Page 302: ...8 114 SCSI and I O ...
Page 308: ...Support Information B 2 HP 9x9KS Block Diagram Figure B 1 HP 3000 9x9KS Block Diagram ...
Page 309: ...B 3 Support Information HP K100 Block Diagram Figure B 2 HP 9000 K100 Block Diagram ...
Page 310: ...Support Information B 4 HP K2x0 K4x0 Block Diagram Figure B 3 HP 9000 K2x0 K4x0 Block Diagram ...
Page 311: ...B 5 Support Information Kx70 Kx80 Block Diagram Figure B 4 HP9000 Kx70 Block Diagram ...
Page 342: ...Memory Configuration Guidelines C 16 ...
Page 350: ...D 8 New System Features ...