Adaptec GDTSETUP Manual de instalación descargar pdf (Pagina 50)

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 necessa-

ry 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

another participant. If there is only one SCSI device connected to the SCSI-bus, "Discon-

nect" should be disabled.

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If a drive supports a particular SCSI specification (II, or III) you should always use the hig-

hest 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

always be enabled (On).

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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 com-

mand 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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Adaptec GDTSETUP Manual de instalación Pagina 50