Troubleshooting
Problem
SCSI device is not seen during POST/startup for the Servers and IntelliStation.
Resolving The Problem
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SCSI device troubleshooting |
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When a device attached to the SCSI adapter is not seen during POST/startup, check the following:
Note: Inspect each SCSI device for the following: ID, damaged connector, power connected, cable, termination. If you are using an IBM server, check the IBM ServerProven Web site to make sure the device in question is IBM compatible with the server.
- Ensure SCSI termination is set correctly.
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- Termination is always done at the adapter, and at the end of the SCSI chain. The only exception to this is if both Internal and External 16-bit devices are being used off of the same adapter. This causes the adapter to do pass-through SCSI and Termination is required at both ends of the SCSI chain. SCSI adapters have a termination setting within the SCSI Select Utility. The default setting for termination is automatic. It is suggested to leave this setting.
- Determine if the SCSI cable in use is self terminating. To do this, visually inspect the end of the cable for a black block.
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- If the black block is present, this is a terminated cable. Now confirm that none of the devices attached to this cable are set to provide termination. Termination cannot be set more than once.
- If the black block is not present, this is not a terminated cable. Now confirm that termination is provided by a device on the SCSI bus. There must only be one device set to terminate, and the terminating device must be connected at the end of the SCSI chain. If the SCSI cable is not self terminating, verify if it is 8 bit or 16 bit and terminate the SCSI chain either using a active terminator or on the last device in the chain. 16 bit or Wide cabling should be terminated with a 16 bit or wide terminator or device. If a 8 bit terminator is used on a 16 bit cable, only the lower bits will be terminated. This causes the higher bits to bounce along the SCSI cable and can cause SCSI communication problems.
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Ensure SCSI IDs are set correctly.
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The SCSI adapter by default is normally set to ID 7. It is suggested to leave this setting at its default and if during troubleshooting find that the ID has been changed, to Load Default Settings of the SCSI adapter which will reset the adapter's ID back to 7.
- The default startup (boot) SCSI ID is 0 for a SCSI hard disk drive.
- An UltraSCSI adapter supports SCSI IDs 0 to 15.
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If you install additional SCSI devices, you must set a unique ID for each SCSI device that you connect to the SCSI cable.
- The SCSI device ID is also known as the SCSI address or physical unit number (PUN). This unique ID enables the SCSI adapter to identify the devices and to prevent two devices from sending or receiving data on the SCSI bus at the same time.
- If you install wide (16-bit) SCSI devices, you can set the IDs to any number between 0 and 6, or between 8 and 15.
- If you install narrow (8-bit) SCSI devices, you can set the IDs to any number between 0 and 6.
- SCSI devices use a variety of methods to set the SCSI ID, such as jumpers, thumb wheels, or switches.
- Use the SCSI Device Utility in the SCSISelect Utility program to view the SCSI IDs of SCSI devices in the system.
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The SCSI adapter by default is normally set to ID 7. It is suggested to leave this setting at its default and if during troubleshooting find that the ID has been changed, to Load Default Settings of the SCSI adapter which will reset the adapter's ID back to 7.
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Ensure the SCSI Cable is not damaged or bad.
- Check connectors for bent pins. It only takes one bent pin to cause a bad connection. Check the cable for signs of fraying. Sometimes cables that are folded excessively can have damage that is not evident. Each wire inside of the cable must be intact to receive a steady SCSI signal. Try another connector on the existing cable, or if a new cable is available, switch the new one out with the old.
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Ensure the SCSI Controller or SCSI Channel is not damaged or bad.
- This would less likely, however, is not impossible. To test a channel try a known good working cable and device such as a hard disk drive from another machine and attach them to this controller. If the device is known good and still is not seen then the controller is probably damaged or has a bad channel. Have it replaced. See the HMM of the specific system and/or the installation guide for the controller.
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Ensure the SCSI Device is not damaged or bad.
- To test the device try it attached to a known working SCSI adapter with a known good cable. If after all of the above has been tried and checked and the device is still not recognized, the device is bad, replace it. See the HMM of the specific system and/or the installation guide for the device.
Note: If the tip above does not solve the issue, or an IBM component is determined to be faulty, please contact your local IBM Support Center for further troubleshooting or warranty replacement of parts. Please have your Machine Type-Model, serial number, and component Field Replacement Unit (FRU) / Customer Replacement Unit (CRU) part numbers available.
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Additional information |
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Document Location
Worldwide
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Document Information
Modified date:
23 January 2019
UID
ibm1MIGR-40710