Справочник Пользователя для ATTO Technology 3100
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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.
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.
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)
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.
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-3
specification, some devices do not react very well to a bus
reset when the initiator is powered up. Set this field to
disabled if the host cannot detect connected SCSI devices.
the FibreBridge. Even though it is called out in the SCSI-3
specification, some devices do not react very well to a bus
reset when the initiator is powered up. Set this field to
disabled if the host cannot detect connected SCSI devices.
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.
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.
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.
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.
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
Options
2200/3200
in-band
2200/3200
Ethernet
2200/3200
serial port
4500 in-
band
4500
Ethernet
4500 serial
port
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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