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The SCSI-bus knows two methods of data transfer: asynchronous and synchronous transfer.
Each SCSI device must be able to perform the first type of transfer, the second one is op-
tional. The advantage of the synchronous transfer consists in a higher data transfer rate,
since the signal transfer times on the possibly long SCSI-cable have no influence on the
transfer rate anymore. Two SCSI-bus participants which want to exchange data between
each other have to check if and how (i.e., with which parameters) a synchronous data
transfer between them is possible. Therefore, the mere setting does not automatically en-
able synchronous data transfer; this mode is only effective if both devices support it and
after they have checked their capability of communicating with each other in this mode.
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This is the synchronous data transfer rate in MB/se. Ultra SCSI allows on a 8 Bit bus 20MB/s
and on a 16 bit bus 40MB/s.
If a given SCSI-cable does not allow 10.0 MB/s ( = FAST-SCSI), the data transfer rate can be
reduced to a value that allows a trouble-free data transfer. The reason for such a restriction
is not necessarily a "bad" SCSI-cable. Lowering the transfer rate may also become necessary
when you set up a special configuration with a very long SCSI-cable whose length simply
does not allow 10.0 MB/s.
Even if you set the maximum speed to 10, 20 or 40 MB/s, this does not mean that the SCSI
device actually supports this transfer rate.
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The concept of the SCSI-bus allows several participants (8 IDs with 8 LUNs each). All these
participants ought to be able to use the bus in a manner that causes the least reciprocal
disturbance or obstruction. A participant should therefore vacate the bus if he does not
need it. For reasons of performance, it is particularly important to guarantee a high degree
of action overlapping on the SCSI-bus. This high degree of overlapping becomes possible
when a SCSI device is enabled to be disconnected, thus leaving the bus to be used by an-
other participant. If there is only one SCSI device connected to the SCSI-bus, "Disconnect"
should be disabled.
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If a drive supports a particular SCSI specification (II, or III) you should always use the high-
est protocol level the drive supports.
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This is the read ahead cache of the hard disk. Because of performance reasons it should al-
ways be enabled (On).
'LVN:ULWH&DFKH2Q2II
This is the delayed write cache of the hard disk. Because of performance reasons it should
always be enabled (On), except during the installation of operating systems like Windows
95 and Windows NT.
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Tagged Queues is a SCSI feature which allows the drive to execute more than one command
at a time.
If you leave this configuration form with <ESC> and you have made changes , GDTSETUP
displays a security request.
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