DLT4000 on R Class server

[David Holden]

I am trying to build a new backup server. Ihave built an R-Class running HP-UX 11.0 and installed all of the recommended patches. I have then attached a DLT4000 2/15 (A4851A)Tape Library to it. What I am trying to find out is how to configure the Library. Basically it does not show up in SAM and It looks as thought the server doesn't even recognise it is there.

Does anyone have any idea how we go about getting this recognised and configured ?

I have attached a copy of ioscan -fn for info

[Robert-Jan Goossens]

Hi,

Did you add the sctl + stape drivers to the kernel ?

Regards,
Robert-Jan

[T G Manikandan]

It looks like there is some problem with the SCSI.

Do not mix SE & differential.Make sure that the adapters are compatible and make sure you are using the proper SCSI cable.

[Ravi_8]

Hi

First install recent QPK patch bundle (available in support plus media).

sam--> peripheral devices-->tape drives

after reboot
#ioscan -fnC tape
should show tape library.

else look for installation guide of tape library

[Pete Randall]

As TG mentions, 9 times out of 10, these DLT connection problems stem from SCSI mismatches. Double check your server's interface and the DLT interface to make sure they are of the same type.


Pete

[Steven E. Protter]

An R Class Server is probably not going to be able to fully utilize that tape drive.

Still, you should get decent speeds.

The driver won't show up though until you do this:

sam
kernel
drivers
find stape, make sure its state is IN

Process a new kernel off the action menu.

Also, make sure the scsi address and id is compatible with the device and the rest of the system and the cabling is solid.

SEP

[David Holden]

Yes they are both in the kernel. I have attached a copy of what drivers we have installed in the kernel

[Pete Randall]

Dave,

OK, the library seems to be either Ultra-Wide or Fast-Wide. You should be able to tell by looking at the connector: 50 pin is F/W, 68 pin is Ultra. What interface are you connecting to on the R? I don't see an Ultra-Wide interface available through Partsurfer, so I have to wonder if you're trying to connect a 68 pin Ultra-Wide drive to a F/W interface?


Pete

[David Holden]

The interface cards are marked as Fast Wide differential and are 68 pin as are the conenctors on the library.

[A. Clay Stephenson]

This library should work just fine with an R or D box. I suspect that what is wrong is bad DIP switch settings on the back panel of the library. This library has connections for both SE and FWD/HVD SCSI but only the FWD/HVD SCSI is supported under HP-UX. Make sure that the DIP switch is set for "DIFF".
Note that there is a set of switches for each SCSI bus in the library. The robot and drive 1 are on bus 1 and drive 2 is on bus 2. It is legal and supported for two DLT4000's to share a common bus so you could daisy-chain the two library buses but if you do make certain that TERMINATION is ON on only the end bus. At least one device on the bus must also supply termination power. Because this library can terminate, do not add an external terminator -- or if you do then make sure that terminaton is "OFF" on the library.

I assume that you are probably going to use 8/8 (c2) and 8/12 (c3) as your controllers.
The preferred setup would be to put each drive on a separate bus.

You must use the library front panel to assign SCSI ID's for the drive and robotics.

[David Ruska]

> OK, the library seems to be either Ultra-Wide or Fast-Wide. You should be able to tell by looking at the connector: 50 pin is F/W, 68 pin is Ultra.

The library is actually a narrow SCSI device, but it uses wide (68 pin) connectors for HVD (and 50 pin for SE).

Clay's information on the rear switch settings and cabling are exactly right.

Here's the users manual for the A4851A:
http://h20000.www2.hp.com/bizsupport/CoreRedirect.jsp?targetPage=http%3A%2F%2Fh200001.www2.hp.com%2Fbc%2Fdocs%2Fsupport%2FSupportManual%2Flpg28402%2Flpg28402.pdf

[David Holden]

Thanks for the advice, it turned out to be a duff scsi card. We had two identical cards and both were recognised by the OS. However when we daisy chained the library off just one scsi card it worked straight away. Just need to get the duff card swapped out now.