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Maintaining disk drives
Issue 3.3 February 2003 103
SunSwift connections – The following figure shows how to connect UniPack SCSI disk
drives and tape drives to a SunSwift card. A 68-to-68-pin SCSI cable connects from the
SunSwift PCI card on the back of the computer to the IN connector on the back of the SCSI
device that is closest to the computer. If you have more than one SunSwift card, connect
the drives to the card in the lowest slot number. A 68-to-68 pin SCSI cable connects from
the OUT connector of that device to the IN connector of the next device. Continue this
process until all assigned devices are connected in the SCSI chain.
.
When connecting SCSI devices, the last device in the chain MUST be terminated, either
via an auto-terminated device or with a manual terminator.
When using an auto-terminated SCSI device, you do not need to connect a SCSI
terminator to the OUT connector of the last SCSI device in the chain. To verify that the last
device is auto-terminated, check the LEDs labeled Auto Term High and Auto Term Low on
the back panel of the device. In a CMS configuration, both LEDs are lit on the last device in
the SCSI chain. If a device in the SCSI chain is not the last device, neither termination LED
is lit.
When using a manually-terminated device, you must connect a SCSI terminator to the
OUT connector of the last SCSI device in the chain. When you connect the SCSI
terminator to the OUT connector, the LED on the terminator is lit.
Stack of three
external SCSI devices
SunSwift card
in PCI slot 2
Back panel of Ultra 5
IN
IN
IN
OUT
OUT
OUT
68-to-68 pin SCSI cable
Target
address
switch
68-to-68 pin SCSI cable
scsi_sunswift.cdr