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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Termination (Internal SCSI Devices)
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.
You must remove the termination from the other devices
within the chain. If you attach external devices
to a non-disk-array model with internal devices attached,
you must also change the termination setting
of the SCSI-2 adapter from the default
in the SCSISelect
utility program, as described in 'SCSISelect Utility Program'.
NOTE:
Read the README file on the SCSI-2 Fast/Wide PCI-Bus Adapter Configuration Option Diskette for updated information.
Select Option Diskette from the first menu.
Termination on disk-array models is automatically set.
The requirements for terminating internal SCSI devices on
non-disk-array models are:
- If you attach internal SCSI devices to only one of the
SCSI-2 adapter internal connectors, you must
terminate the last internal device on the bus (cable) and
disable the termination on the other devices connected to the
internal SCSI connector.
The SCSI-2 adapter is already terminated.
- If you attach internal SCSI devices to both of the
SCSI-2 adapter internal connectors,
you must terminate the last internal device on each
internal cable and disable the termination on the other
devices connected to the internal SCSI connectors.
You must also change the termination setting
of the SCSI-2 adapter from the default in the SCSISelect
utility program, as described in 'SCSISelect Utility Program'.
NOTE:
You can use only one of the two internal SCSI connectors on the
SCSI-2 adapter if you connect both internal and external devices.
A CD-ROM drive is installed in bay 4 of non-disk-array models and
bay 7 of disk-array models. In non-disk-array models that are supplied
with a narrow hard disk drive a narrow (8-bit) cable is provided.
In non-disk-array models that are not supplied with a hard disk
drive:
- The CD-ROM drive is terminated.
A narrow (8-bit) cable is provided in these models.
- If you install 8-bit drives above
the CD-ROM drive in bays 5-9, remove the termination from those
drives.
- If you install a drive in bay 1, you must terminate that
drive and remove the termination from the CD-ROM drive
- If you install a 16-bit device,
you must purchase a 16-bit cable and
a 16-bit to 8-bit SCSI Internal Converter
to connect the CD-ROM drive to the 16-bit cable.
Refer to the instructions supplied with the SCSI device for more
information about termination.
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