4.3 SCSI Port configuration panel
This panel is used to modify the SCSI parameters for the FibreBridge. Some parameters will be “grayed out” if they do not apply to your model of the FibreBridge or if they have no effect based upon the selected value of a related parameter.
Each SCSI port on FibreBridge models with more than one port must be configured separately. Each has its own sub- panel marked as SCSI port 1, SCSI port 2, etc.
Force SCSI Negotiation Rate (default = Ultra2 Wide SCSI)
The FibreBridge is designed to negotiate the most efficient SCSI transfer rate with the attached SCSI devices. Some devices and applications work better if you force the transfer rate to a slower speed. Leaving the FibreBridge at the default Ultra2/Wide SCSI rate will allow the auto- negotiation function to determine the transfer rate.
Reset SCSI Bus on Startup (default = Enabled)
Disables the function to reset the SCSI Bus upon startup of the FibreBridge. Even though it is called out in the
SCSI Initiator ID (default = 7)
If the ‘Use SCSI Initiator Soft ID’ is enabled, used to enter the ID for the SCSI Initiator Port of the FibreBridge. The SCSI port on the FibreBridge is similar to a SCSI host adapter in that it needs to have a SCSI ID that is different than the SCSI devices connected to it.
Selection Timeout (default = 256 ms)
Sets the amount of time the FibreBridge will wait for a SCSI device to respond after a selection request. The timeout periods that can be selected are 256 ms, 128 ms, 64 ms, 32 ms, 16 ms, 8 ms, 4 ms, 2 ms and 1 ms.
Tagged Command Queuing (default = Enabled)
Leaving Tagged Command Queuing for the SCSI Ports of the FibreBridge enabled allows maximum performance. Tagged Command Queuing is an optional SCSI II command scheme in which multiple tagged commands are sent to the drive for processing. The tagged commands are kept in the drive's command buffer where they are sorted into an optimal sequence by the drive's microprocessor and then executed. Optimization orders the commands to require the least amount of seeking and rotational latency in the drives. TCQ additionally cuts down on the SCSI overhead by buffering the incoming SCSI commands.
Some devices do not support Tagged Command Queuing and do not react properly when the initiator attempts. Try setting this field to disabled if you have trouble reading and writing to SCSI devices connected to the FibreBridge.
Use SCSI Initiator Soft ID (default = Disabled)
Enables selection of the SCSI Initiator ID for the SCSI Bus of the FibreBridge. When disabled, the SCSI ID is taken from the jumper settings on the FibreBridge circuit board. The factory default value is SCSI ID 7.
Some options will be “grayed out” on the panel: they are not available because of the type of access mode or FibreBridge model or they have no effect based on other
selections. The chart below shows options available based on model and access method.
Model/Access method | 2200/3200 | 2200/3200 | 2200/3200 | 4500 in- | 4500 | 4500 serial |
Options | Ethernet | serial port | band | Ethernet | port | |
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Force SCSI Negotiation Rate | ● | ● | ● | ● | ● | ● |
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Reset SCSI Bus | ● | ● | ● | ● | ● | ● |
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SC Initiator ID | ● | ● | ● | ● | ● | ● |
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Selection Timeout | ● | ● | ● | ● | ● | ● |
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Tagged Command Queuing | ● | ● | ● | ● | ● | ● |
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Use SCSI Initiator Soft ID | ● | ● | ● |
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