Connecting More Than One External Scsi Device - Silicon Graphics O2+ Hardware Reference Manual

Connecting More Than One External SCSI Device

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6. Turn on the device, and then turn on the workstation. You must turn on the
equipment in this order, so that the workstation recognizes the device.
7. To check that the system recognizes the new SCSI device, from the Toolchest, select
System > System Manager > About This System. External SCSI devices are shown
here.
For more information, see "Hardware and Devices" in Personal System Administration
Guide.
Read the following guidelines before you begin the process of connecting the SCSI
device.
• You can connect both 16-bit wide (68-pin) and 8-bit narrow (50-pin) SCSI devices to
the workstation, but you must install the wide devices as a group closest to the
workstation. Place the narrow devices at the end of the daisy-chain.
• If the first external device is a 68-pin device, you can daisy-chain a 50-pin device to
it, but you cannot then daisy-chain a 68-pin device to the 50-pin device.
• You can use a 68-pin device as the first device, a 68-pin device as the second device,
and a 50-pin device as the third device.
• On an O2+ workstation, wide and narrow SCSI devices can coexist on the same bus
because the SGI 68-pin to 50-pin cable includes an active terminator for the extra
data lines in the 68-pin connector.
In summary, the accepted and incorrect configurations are as follows:
Accepted configurations:
68-pin to 50-pin
68-pin to 68-pin to 50-pin
Incorrect configuration:
68-pin to 50-pin to 68-pin
To connect more that one external SCSI device, follow these steps:
Connecting External SCSI Devices
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