Adaptec GDTSETUP Manual do Utilizador descarregar pdf (Página 44)

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On the following pages, are some examples of correct SCSI cabling.

First of all a few general tips:

 The ICP firmware always assigns the Narrow/Ultra SCSI Channel as the last channel

number. I.e.,

ICP Controller Wide/Ultra2 SCSI Channels Narrow/Ultra SCSI Channel

GDT6118RD

GDT6518RD

GDT6128RD

GDT6528RD

A, B C

GDT6538RD A, B, C D

GDT6558RD A, B, C, D, E F

 SE-devices (e.g., Ultra SCSI hard disks, CD-ROM drives, DAT drives, Scanners, Printers,

DLT drives, etc.) should always be connected with the Narrow/Ultra SCSI channel of the

ICP Controller. This SCSI channel, which is completely independent of the Wide/Ultra2

SCSI channels, was specifically integrated onto the ICP Controllers for these kinds of

SE-devices. Whoever is familiar with the ICP Controllers of the RP Series knows that this

separate Narrow/Ultra SCSI channel is as valuable as a GDT6111RP controller.

 If it cannot be avoided that SE-devices and LVDS-devices are connected with a

Wide/Ultra2 SCSI channel, you have to be aware of the fact that the whole bus will then

operate in SE-mode (cable length 1.5 meters). Imagine the following scenario: A SCSI

bus system was initially set up with a 10-meter cable and 6 Wide/Ultra2 hard disk drives.

As soon as you connect an SE-device (e.g., an Ultra SCSI hard disk) with this channel,

the SCSI-Mode is automatically switched to SE. Therefore, the maximum cable length is

reduced to 1.5 meters and therefore the whole setup will not work any longer.

 All ICP Controllers of the RD Series have a yellow LED for each Wide/Ultra2 SCSI chan-

nel. This LED indicates the current SCSI-Mode of the corresponding channel. If the LED

is lit, the Wide/Ultra2 SCSI channel is operating in LVDS-Mode.

If the LED is not lit, this channel is operating in SE-Mode only.

(The same applies to the SCSI accessories Art.No.: 8951 and 8952. There are two LEDs

indicating the current SCSI-Mode: Green=SE, Yellow=LVDS).

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Adaptec GDTSETUP Manual do Utilizador Página 44