HP Smart array 6400 Controller - SCSI Bus Termination Error

bri_stc
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I have a HP Proliant ML370 G4 server running Windows Server 2003 SP1.  I am trying to attach a Quantum ATL Superloader tape backup unit to the scsi ports on the back of the server.  When I try to boot after I connect the device, I receive error "1776 - Slot 1 - SCSI Bus Termination error - Internal and external drives cannot both be attached to the same scsi port.  Controller is disabled."  If I disconnect the Quantum unit, my server will boot as normal.  I've tried updating the firmware for the controller, and still get the same error.  
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Commented:
Any suggestions greatly appreciated....

Commented:
I think I would focus on the termination error aspect of this issue. I have not worked with SCSI for a long time but once I had a scanner cause similar problems. I discovered that the scanner had its own set of jumpers on it and changed them to indicate the device was the cap end of a chain and then it worked just fine. Also have you gone to the HP support site?
Top Expert 2007
Commented:
Where are you connecting the backup unit?  To the onboard scsi controller or to you array controller?
If the former, your loader should have some sort of termination, but I don't think that's the problem.
It sounds to me like you have a smart array controller and you are trying to hang the tape unit off of port 1 of that controller, when internally you've cabled your drive cage to port 1....
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Author

Commented:
Yes, I've tried the HP support site, as well as talking to HP.  They are the ones that suggested updating the firmware.  But said that if that didn't fix the problem, it would be a compatibility problem with the Quantum unit and out of there hands.
Sounds like your plugging the tbu into a port thats already has an internal scsi device(s) attached. Many scsi controllers with have access to the channels with an internal and an external port but you can only use one or the other per channel. For example a 2 channel scsi controller with channel 0 and channel 1, you can have internal hdds plugged into channel 0 and an external tbu in channel 1 but you couldn't have the internal hdds and the tbu plugged into channel 0. Also make sure the scsi controller your plugging the tbu into is not a scsi raid controller they don't support tbu's they support hdds only.

Author

Commented:
I'm connecting the backup unit to the array controller.  The loader does have some sort of termination, and it worked fine on when connected on an older server.   I've verified that all connections and terminators are secure.

I would agree with sirbounty that the problem is how we've internally called the drive cage, but I don't know how to change that...kind of green in that area....help

Top Expert 2007

Commented:
"I'm connecting the backup unit to the array controller. "

Connect it to the onboard controller beneath the PCI slots (if memory serves me)
If all you have in the system for a scsi controller is the scsi raid controller, i would suggest adding a scsi controller to the system like a 39160, i do not suggest at all to have a tbu attached to a raid controller, thats just asking for problems.
Top Expert 2007

Commented:
If your array controller (what type?) supports this setup, you would either need to move the external cable to the library to the 'other' port on the array controller (external) or (not recommended) pop the cover and move the internal scsi ribbon cable from the port it's on now to the other port on the same controller card...
Top Expert 2007

Commented:
That a rack mount or table top?

Author

Commented:
Thanks ALL !!! I've added a scsi controller to the system and all seems to be working okay.  
Top Expert 2007

Commented:
:)
Happy to have helped.
~sirbounty
Your welcome

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