IBM 8651RM0 Hardware Maintenance Manual - Page 138

SCSI IDs, Termination Internal SCSI Devices

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SCSI IDs: Each SCSI device that is connected to an individual integrated SCSI controller needs a unique identification (ID) so that the controller can identify the devices and ensure that different devices do not attempt to transfer data at the same time. (The integrated SCSI controllers on the system board operate independently.) If you need to set IDs for SCSI devices, refer to the instructions that come with those devices. The server automatically sets SCSI IDs for hot-swap hard disk drives, according to the jumper settings on the SCSI backplanes. The server uses the hard disk drive SCSI IDs to send status information to the indicator lights above each hot-swap bay. Each of the two SCSI backplanes in the server supports one bank (six) of hot-swap bays. Table 8 shows the default SCSI IDs that the backplanes assign for hot-swap hard disk drives. Table 8. Automatically Assigned SCSI IDs Bank A A A A A A B B B B B B Bay 1 2 3 4 5 6 1 2 3 4 5 6 ID 0 1 2 3 4 5 0 1 2 3 4 5 Note: The default SCSI ID for each SCSI backplane is 15. The default SCSI ID for each SCSI controller is 7. You can change the default ID addresses of the drives by changing the jumper settings on the SCSI backplane. The processing sequence for SCSI devices is set through the SCSISelect Utility program (refer to the SCSI information provided on the System CD-ROM for more information). The sequence proceeds from the lowest SCSI ID to the highest (0 to 6, then 8 to 15). Termination (Internal SCSI Devices): The devices at both ends of the SCSI bus must be terminated. If you attach SCSI devices (internal or external), you must terminate the last device in the chain. Note All the hot-swap drives in the server have automatic termination. If you install SCSI devices in the removable-media bays, you must terminate the last device on the bus (cable) and disable the termination on the other devices connected to the internal SCSI controller. The SCSI controller is already terminated. For example, when you install the first SCSI device in a removable-media bay, set its termination to Enable and install the device in bay 4 (the bottom bay). Then, when 130 Netfinity Server HMM

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SCSI IDs:
Each SCSI device that is connected to an
individual integrated SCSI controller needs a unique
identification (ID) so that the controller can identify the
devices and ensure that different devices do not attempt to
transfer data at the same time.
(The integrated SCSI
controllers on the system board operate independently.)
If
you need to set IDs for SCSI devices, refer to the
instructions that come with those devices.
The server automatically sets SCSI IDs for hot-swap hard
disk drives, according to the jumper settings on the SCSI
backplanes.
The server uses the hard disk drive SCSI IDs
to send status information to the indicator lights above
each hot-swap bay.
Each of the two SCSI backplanes in the server supports
one bank (six) of hot-swap bays.
Table
8 shows the
default SCSI IDs that the backplanes assign for hot-swap
hard disk drives.
You can change the default ID addresses of the drives by
changing the jumper settings on the SCSI backplane.
The processing sequence for SCSI devices is set through
the SCSISelect Utility program (refer to the SCSI
information provided on the System CD-ROM for more
information).
The sequence proceeds from the lowest
SCSI ID to the highest (0 to 6, then 8 to 15).
Termination (Internal SCSI Devices):
The
devices at both ends of the SCSI bus must be terminated.
If you attach SCSI devices (internal or external), you must
terminate the last device in the chain.
Note
All the hot-swap drives in the server have automatic
termination.
If you install SCSI devices in the removable-media bays,
you must terminate the last device on the bus (cable) and
disable the termination on the other devices connected to
the internal SCSI controller.
The SCSI controller is already
terminated.
For example, when you install the first SCSI device in a
removable-media bay, set its termination to Enable and
install the device in bay 4 (the bottom bay).
Then, when
Table 8. Automatically Assigned SCSI IDs
Bank
A
A
A
A
A
A
B
B
B
B
B
B
Bay
1
2
3
4
5
6
1
2
3
4
5
6
ID
0
1
2
3
4
5
0
1
2
3
4
5
Note:
The default SCSI ID for each SCSI backplane is 15.
The default SCSI ID for each SCSI controller is 7.
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