Choosing Scsi Ids - Intergraph Zx10 5U System Manual

SCSI Bus
Ultra (8 bits, 20 MB/sec)
Wide Ultra (16 bits, 40 MB/sec)
Ultra2 (16 bits, 80 MB/sec)
Ultra3 (16 bits, 160 MB/sec)
The total cable length on the system's SCSI bus is the sum of the following:
SCSI cable for the disk drive cage – 31 in (78.7 cm)
SCSI cable for the peripheral bay and the external port – 76 in (193.0 cm)
SCSI cable between the system and the first external device
SCSI cables between additional external devices
SCSI cable inside each device connected to the cable
To ensure data integrity and optimum performance, do the following:
Use the shortest cables possible to connect SCSI devices to the system and to each other.
Use high-quality SCSI cables to ensure adequate shielding (impedance of 110 to 135 ohms).
CAUTION When handling cables, flex them as little as possible. Ensure that cables do not
contact sharp metal surfaces or become excessively bent or twisted. In particular,
SCSI cables should not have any creased bends.

Choosing SCSI IDs

To determine the ID of each SCSI device on the system, restart the system. When the BIOS screen
displays, look for a list of SCSI devices and write down the ID for each device.
By default, some SCSI IDs are already used by system devices:
The primary system disk drive uses SCSI ID 0
The SCSI controller uses SCSI ID 7
See the vendor documentation for details on setting a device's SCSI ID.
Single-Ended Bus Differential Bus
4.9 ft / 1.5 m 39.4 ft / 12 m
Not recommended Not specified
Not recommended Not specified
Not recommended Not specified
typically 8 in (20.3 cm) or less
53
LVD Bus
39.4 ft / 12 m
39.4 ft / 12 m
39.4 ft / 12 m
39.4 ft / 12 m