Question about Adaptec Cables & Converters ACK-68I3-LVD-LP-Round-U320 Int ULTRA320 SCSI 3-Position Cable (2017100)

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SCSI Inquiry Command Failure w/Tandberg TDC 4120 tape drive

All, I am trying to solve a SCSI bus problem and could use some help to determine if the problem is the drive, or the configuration of the controller, or other.

The configuration is as follows:

SCSI Adapter - Adaptec 2940UW w/internal 68 pin & 50 pin connector
- SCSI Termination Setting - Automatic

On the 68 Pin
- 68 pin ribbon cable, 3 connectors, first to the SCSI Host Adatper, second connector open, third connector connected to a Seagate SCSI drive

On the 50 pin ....
- 50 pin ribbon cable, 3 connectors, first to the SCSI Host adapter, second connector open, last connector to a Tandberg TDC 4120 tape drive

When booting, I to the SCSI utilities on the controller. I run the SCSI disk utilities.

During the boot, I can hear the tape drive and disk drive power up, and respond to initialization commands.

When I run the SCSI disk utilities, every device probe will FAIL with a "unexpected timeout error".

Diagnostic Things tried.
- I remove the Tandberg tape drive. The Seagate disk now responds to the inquiry command, the SCSI disk utilities work, and the machine will recognize the disk and work "normally".

- I re-attach the tape drive, and remove the disk drive. I have the same timeout error as described above using SCSI disk utilities. If I just let the machine try to start (don't ), the adapter reports a 'SCSI Inquiry Command Timeout Error' on boot.

Suggestions? I think it is either a termination problem, or the drive is bad. Do I need to change the host adapter termination settings from Automatic to "low/low", "High/Low", "Low/High", or something else?

Thanks in advance,

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Try putting the tape drive on the last scsi termination point.

Posted on Oct 18, 2009

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