Service manual

Chapter 5 Troubleshooting
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11. If a second hard disk drive is connected to the SCSI bus cable, check it for proper SCSI ID
selection, SCSI cable connection, proper power, and jumper settings.
12. Disconnect all SCSI devices except the integrated SCSI adapter and the drive at SCSI ID0, and
try again. If this fails, try substituting a known good SCSI adapter board and a good hard disk
drive.
The SCSI BIOS has trouble loading
If the NetServer has trouble loading the SCSI BIOS, do the following:
1. Review the T
roubleshooting Check list before you continue.
2. If you installed more than one SCSI controller, ensure all the SCSI controller's BIOS is disabled
except for the boot controller. This lets the SCSI BIOS for the boot controller load.
The SCSI subsystem does not work at installation
Many SCSI problems are caused by an incorrect configuration and not by faulty hardware. If the SCSI
subsystem does not work after installation, do the following:
1. Run the DiagTools utility and run the tests for the system board and processor, the memory
subsystem, the SCSI controllers and busses, and SCSI hard drives.
2. Review the Troubleshooting Checklist before you continue.
3. If you don't see the SCSI BIOS banner during system start and the final message "SCSI BIOS
successfully installed" after devices are displayed:
à
àà
à Check the cable connections.
à
àà
à Check the SCSI termination.
4. Check the SCSI host bus adapter (HBA) is properly configured.
The HBA should be SCSI ID 7, always the highest ID number, so that the HBA will always win
SCSI bus arbitration.
5. If you installed more than one SCSI adapter, verify each adapter is set to a separate BIOS
address; or disable the BIOS on all of the adapters except one.
6. For each device, check:
à
àà
à The device has a unique SCSI address.
à
àà
à In general, when selecting an address for a drive (default address is 0), select as low a SCSI
address as possible.
à
àà
à If the device has jumpers, check that the device's jumpers are set according to the device
documentation.
7. Verify the primary SCSI hard disk drive is set to address 0. Each device (the HBA is a device)
must have a unique and separate SCSI ID number. To solve this problem, simply set the
device ID to something other than that of the HBAs SCSI ID (7). If the device is a boot drive,
then the SCSI ID should be set at 0.
8. Go into the SCSI Configuration Utility and set the transfer rate lower. The internal and external
SCSI subsystems are typically LVD and will be set to default at the maximum 80 MB/sec. If the
SCSI system works at lower transfer rate, you may infer a connector problems. Try cleaning
and reseating the SCSI cable. Try another cable.
To change the transfer rate for a SCSI device:
A. Press <CTRL> and <C> keys when prompted to enter the SCSI utility.