External SCSI Devices
External SCSI Devices
If one or more internal devices are attached to the SCSI
controller, only one external device is supported.
connector provides support for SCSI devices installed inside the server.
The external SCSI connector provides support for external SCSI devices.
The UltraSCSI adapter can support a maximum of 15 devices.
- If you plan to install both internal and external SCSI devices,
you must follow the instructions given in
in addition to the instructions in this section.
For additional information about SCSI configurations supported, see
- The server comes with a wide (16-bit) SCSI
cable that supports 16-bit devices. If you want to
attach narrow (8-bit) devices to the server, you
must purchase a SCSI 68-pin to 50-Pin
Converter that will enable the connection of the
device to the cable that comes with the server.
- It is good practice not to exceed the following
- If you connect one or more UltraSCSI devices to the UltraSCSI adapter, do not
exceed 1.5 meters (5 feet) total length for all cables (internal and external).
- If you connect only Fast SCSI devices to the UltraSCSI adapter, do not
exceed 3 meters (10 feet) total length for all cables (internal and external).
- Attention - In addition
to cable length and the number of installed devices, you must consider other
factors that limit the performance of the SCSI subsystem. For example, if you
install UltraSCSI devices in an external expansion enclosure that is limited to
Fast transfer rates, or if you exceed the previously described cable-length
guidelines, the transfer rate to all SCSI devices must be limited to Fast or
standard transfer rates. You accomplish this by using the
SCSISelect Utility program.
If you plan to attach an external SCSI device, you must
order an additional SCSI cable. That is, to use an external
device with the Netfinity 3000 server, you must connect it
to the external SCSI connector, using a SCSI cable. This
SCSI cable must have the proper connector for the SCSI
external connector on one end, and the proper connector
for the external device on the other end. To select and
order the correct SCSI cable for use with the external
device, contact your IBM reseller or IBM marketing
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