hp workstation xw4100 service and technical reference guide
B–1
B
SCSI Devices
SCSI guidelines
NOTE:
These systems support a mixed configuration of UATA/IDE and SCSI hard drives. In a
mixed configuration the UATA/IDE drive must be specified as the boot drive.
When installing and operating SCSI devices, you must follow these guidelines:
■
A narrow (50-pin) SCSI controller allows you to daisy-chain up to 7 additional SCSI
devices. Counting the controller, that amounts to 8 total SCSI devices.
■
A wide (68-pin) SCSI controller allows you to daisy-chain up to 15 additional SCSI devices.
Counting the controller, that amounts to 16 total SCSI devices.
■
If two narrow (50-pin) SCSI controllers are each connected to separate system board SCSI
connectors, each controller may have seven SCSI devices attached. Counting the controller,
this gives a total of 16 SCSI devices on the system.
■
HP does not recommend mixing different width SCSI devices on the same SCSI chain or on
the same SCSI channel. Mixing devices of different widths on the same chain or channel will
always result in a data transfer rate of the slowest machine in that chain. The only exception
to this is that Ultra Wide SCSI devices will cause a speed degradation when mixed with other
68-pin devices.
■
If multiple SCSI devices are used, split the devices between Channels A and B for optimum
performance. Cable length for the second channel should not be longer than 18 inches.
■
If two controllers are used, each may use SCSI devices having widths and speeds different
from the other. If a 68-pin data cable is used on a controller having 50-pin SCSI devices, use
an internal cable adapter or an external cable adapter.
Ä
CAUTION:
Do not route data cables near the air intake to the power supply. Cables routed in this
manner may block the airflow and cause the workstation to overheat.
■
All SCSI controllers require a unique SCSI ID (0-7 or 8-15) for each SCSI device installed.
The controller identifies a SCSI device by its SCSI ID number rather than its location.
Moving a SCSI device from one position to another on the SCSI chain does not affect
communication between the controller and the device. The reserved and available SCSI ID
numbers for SCSI devices are:
❏
0 is reserved for the primary hard drive.
❏
7 is reserved for the SCSI controller.
❏
1 through 6 and 8 through 15 are available for all other SCSI devices.
■
68-pin SCSI controllers require a 53 inch maximum length-twisted pair, LVD cable with
built-in terminator, maximum of 5 drives with a minimum driving spacing of 5.25 inches.
Содержание Workstation xw4100
Страница 138: ...A 10 hp workstation xw4100 service and technical reference guide Ultra ATA drive guidelines and features ...
Страница 146: ...C 4 hp workstation xw4100 service and technical reference guide SATA Devices ...
Страница 150: ...D 4 hp workstation xw4100 service and technical reference guide system board and riser board reference designators ...
Страница 158: ...E 8 hp workstation xw4100 service and technical reference guide connector pin assignments ...
Страница 160: ...F 2 hp workstation xw4100 service and technical reference guide power cord set requirements ...
Страница 166: ...H 4 hp workstation xw4100 service and technical reference guide additional password security and resetting CMOS ...
Страница 170: ...I 4 hp workstation xw4100 service and technical reference guide quick troubleshooting flowcharts no power part 2 ...
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