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M3099GX/GH OEM Manual 3-111
INTERFACE
5) All pertinent system tuning parameters are established where
known. Note that these may be modified dynamically to improve
the performance characteristics of the system.
The following procedures show the sequences necessary to
implement a system that initializes itself with a minimum of
information available at power on time. Many real systems are not so
generalized, having considerable information available about the
proper configuration at power-on time. In those cases, the sequence
steps that would have been necessary to obtain that predefined
information may be skipped or ignored.
General Procedure for Initializing Devices
Initiator Activities:
Power On: It is assumed that each SCSI device, as it is powered on,
performs appropriate internal reset operations and internal test
operations. Once powered on, initiators that have target capability
should be prepared to respond to a selection within a system-specific
time.
Reset: At power-on time, it is likely that an SCSI device has caused
errors to the ongoing activities on the SCSI bus. A bus reset should
be generated to notify attached devices that any activities that may
have been occurring should be restarted .
Find Device: Each SCSI address other than the initiator’s SCSI
address should be tested to determine if an SCSI device responds. If
an SCSI device responds, an INQUIRY command to logical unit 0
should be executed. The information obtained indicates the device
type, manufacturer, and model of the attached logical unit 0 if the
response data format field is one or two. If the response data format
field is zero, only the device type field is valid. In addition, the
version of command set supported by the device is indicated by the
ANSI-approved version field.
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