Adaptec 2015S Software User Guide - Page 28

As reported, Configuring Termination, Adaptec SCSI RAID, Installation Guide, bus data errors - ultra320

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Page 28 highlights

Storage Manager on ROM Note: As reported means that the field displays the value returned by the controller firmware. Bus Each peripheral bus on a controller is assigned a number. Numbering starts with 0 for the first bus, 1 for the second bus, and so on. ID (SCSI only) SCSI RAID controllers are configured by default at ID 7. This value should not be changed unless required for special configurations. Type This is the type of bus (Ultra320, Ultra160, etc.). Width The width of the parallel bus (8-bit or 16-bit). Transfer Rate The controller automatically negotiates with each device at powerup or reset to set the maximum transfer rate. This parameter limits the transfer rate to the value selected. This setting should not be changed except when you are troubleshooting bus errors. Note: On buses, if setting this parameter to 5 MHz eliminates bus data errors, this is usually an indication that the bus is too long or that the bus is not terminated correctly. Termination This option controls the termination for the controller and bus. The default value (On) should not be changed unless both internal and external cables are attached to the controller. Refer to the Configuring Termination section in the Adaptec SCSI RAID Installation Guide for information on setting this parameter. 2-15

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2-15
Storage Manager on ROM
Note:
As reported
means that the field displays the value
returned by the controller firmware.
Bus
Each peripheral bus on a controller is assigned a number.
Numbering starts with 0 for the first bus, 1 for the second bus, and
so on.
ID (SCSI only)
SCSI RAID controllers are configured by default at ID 7. This value
should not be changed unless required for special configurations.
Type
This is the type of bus (Ultra320, Ultra160, etc.).
Width
The width of the parallel bus (8-bit or 16-bit).
Transfer Rate
The controller automatically negotiates with each device at power-
up or reset to set the maximum transfer rate. This parameter limits
the transfer rate to the value selected. This setting should not be
changed except when you are troubleshooting bus errors.
Note:
On buses, if setting this parameter to 5 MHz eliminates
bus data errors, this is usually an indication that the bus is too
long or that the bus is not terminated correctly.
Termination
This option controls the termination for the controller and bus. The
default value (
On
) should not be changed unless both internal and
external cables are attached to the controller. Refer to the
Configuring Termination
section in the
Adaptec SCSI RAID
Installation Guide
for information on setting this parameter.