Chapter 5. Troubleshooting
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## Chapter 5. Troubleshooting

Use the following troubleshooting checklist to determine an installation problem:

- The power cables are connected to the workstation and the monitor.

- The cable connectors at the chassis I/O panel are inserted correctly, wide key matched to wide key, and narrow key matched to narrow key. (It is possible to force these connectors together improperly.)

- The cable connectors at the chassis I/O panel are completely seated.

- The Ultra SCSI option board and graphics board are properly seated in the chassis. Follow instructions in Chapter 2 for opening the chassis.

- The appropriate operating system and software have been installed. (See the software CD and release notes that came with your shipment.)

- The graphics boards are inserted toward the interior of the workstation.

- The XIO module is seated and the I/O panel on the Ultra SCSI option board is relatively flush with the chassis. If not, follow the instructions in Chapter 2, “Preparing the Workstation”, from powering off the workstation through removing the XIO module, and see if an XIO compression connector cap is on any XIO compression connector. If so, remove the cap, and follow the instructions in Chapter 2 for reinstalling the XIO module and powering on the workstation.

## Troubleshooting Installed Devices

Use the information in Table 5-1 for troubleshooting the installation of SCSI devices.

Table 5-1. Troubleshooting the Installation of SCSI Devices

Symptom | Problem | Solution
--- | --- | ---
All device IDs appear the same. | A device was given the same ID as the host controller ID. | Check the bus ID, then reassign a new number to the device.
Two devices are installed, but only one ID is shown on the system. | Two identical IDs were assigned. | Assign a new number to one device.
A single-ended device is installed, but the device is not recognized. | A differential channel does not recognize single-ended devices. | Remove the single-ended device.

## Troubleshooting SCSI Types, Channels, and Cable Lengths

Use the information in Table 5-2 for information about SCSI types, channels, and allowed cable lengths.

Table 5-2. Maximum Cable Lengths for SCSI Options and Configurations

SCSI Types | Channel | Maximum Cable Length of All Devices Daisy-chained on One Channel.
--- | --- | ---
Differential (Fast 10) | 0, 1, 2, 3 | 25 m
Differential (Fast 10, wide,) | 0, 1, 2, 3 | 25 m

| Note: Single-ended and differential SCSI peripherals use incompatible integrated circuitry and cannot be mixed on the same bus unless converters are used. No damage will occur, but no devices on the bus will operate.

## Useful Tools for Getting Information About SCSI Devices

To determine assigned SCSI addresses, choose Toolchest > System > System Manager > Hardware and Devices > About This System.

For accessing information about SCSI devices, open a UNIX shell and at the prompt type `hinv` or`scsiha```

Also see other reference material, such as the IRIX Admin guides or man pages in the Toolchest for information about `scsiha` or `ioconfig`.

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Chapter 4. Removing the Ultra SCSI Option Board |  | Appendix A. Identifying Graphics Boards and the Ports and Modules on the Back of the Workstation