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Note: If you install a PCI RAID adapter to configure and manage the internal
hot-swap drives, you must move the SCSI cable from the system-board
SCSI connector to an internal channel connector on the RAID adapter. See
“Cabling example for the ServeRAID adapter” on page 56 for additional
information.
SCSI cabling requirements
If you plan to attach external SCSI devices, you must order additional SCSI cables.
To select and order the correct cables for use with external devices, contact your
IBM reseller or IBM marketing representative.
For information about the maximum length of SCSI cable between the terminated
ends of the cable, refer to the ANSI SCSI standards. Adhering to these standards
will help ensure that the server operates properly.
Setting SCSI IDs
Each SCSI device connected to a SCSI controller must have a unique SCSI ID.
This ID enables the SCSI controller to identify the device and ensure that different
devices on the same SCSI channel do not attempt to transfer data simultaneously.
SCSI devices that are connected to different SCSI channels can have duplicate
SCSI IDs. The following table lists the SCSI IDs for devices that are connected to
one channel. Note that the hot-swap hard disk drive bay numbers are from bottom
to top.
Table 17. SCSI IDs for hot-swap hard disk drives and backplanes
Standard Optional
Drive bay 1: SCSI ID 0 Drive bay 4: SCSI ID 12
Drive bay 2: SCSI ID 1 Drive bay 5: SCSI ID 13
Drive bay 3: SCSI ID 2 Drive bay 6: SCSI ID 14
Backplane: SCSI ID 8 Backplane: SCSI ID 9
The hot-swap-drive backplane controls the SCSI IDs for the internal hot-swap drive
bays. However, when you attach a SCSI device to the external SCSI connector, you
must set a unique ID for the device. Refer to the information that is provided with
the device for instructions to set its SCSI ID.
SCSI connector pin-number assignments
The following table shows the pin-number assignments for the 68-pin SCSI
connectors.
34
1
68
35
80 IBM xSeries 350 Type 8682: Hardware Maintenance Manual