Rob,

A couple of things to check:

1.  Check the firmware level on your DLT drives.  They should be at level
100.  This is the latest firmware level for DLT4000s that is supported on
the Q47 library.

2.  Make sure your scsi adapter cards are configured correctly regarding
whether they are wide-enabled or not.  If you have narrow devices and wide
adapters, the adapters must be configured (via SMIT) to not be wide-enabled.

..Paul (a Q47/DLT4000/ADSM user)
--
At 03:16 PM 5/6/98 -0500, you wrote:
At 03:16 PM 5/6/98 -0500, you wrote:
>Hello everyone.
>
>I am bangin my head up against the wall trying to figure out why I am
>getting errors trying to configure my DLT libraries on our new AIX
>system.
>
>We have an RS6K model R50 with 2 CPUs, 1024 MB RAM, and 8x9.1 GB SSA
>drives.
>We have previously run ADSM V2 on an HPUX system with 2 BreeceHill Q47
>libraries (4 drive/60 slot).
>We have moved to V3 on AIX and are using the libraries on the new
>hardware platform.
>
>We are running ADSM V3.1.1.0 on the AIX 4.2 system. The system has 4
>SCSI controllers on the 2 MCA buses. We have placed the SCSI library
>interface on 1 SCSI port and the 4 DLT drives on the other SCSI port. (2
>SCSI controllers for each BreeceHill library.)  I have installed the
>ADVANCED DEVICE support within ADSM and its latest patch from
>index.storsys.ibm.com.  Each SCSI bus is within length specifications
>and I have all of the devices configured and defined to ADSM. The system
>works most of the time, but we get intermittent SCSI errors on the bus
>(which shows up in ADSM as an adapter failure) and is also logged to
>errpt. Sometimes I get library errors with have also showed up as being
>bus errors or adapter errors.  I also occasionally get drive /dev/mt<x>
>errors which are also intermittent. Is there something that I should be
>looking at. I have run diag tests on the bus and everything checks out
>ok.  We have AIX 4.2.1 installed and the updates from the update cd that
>shipped with the product.  The drives themselves are defined at boot as
>OST driver devices and do now work with the standard AIX device files
>/dev/rmt<x>... but that is a feature of AIX's OST driver (so I hear).
>
>The configuration within ADSM is that the library is defined as a SCSI
>library, the device class is defined as type DLT and the drive format is
>DLT20 (because they are DLT4000 models).  On our HP system, when it was
>installed, the ADSM software that was using
>these drives was configured as GENERICTAPE and format=DRIVE. Does this
>matter?
>
>Are there SCSI ptf's that I am unaware of? Is there some trick to
>setting up these BreeceHill libraries? They are supported devices for
>use with ADSM....  Why certify something as supported if it does not
>work as directed?
>
>PLEASE, If you have ANY suggestions at all, I would welcome them
>thankfully!!!
>
>IBMers: Are there AIX settings that need to be adjusted? Should I be
>setting characteristics of the scsi adapters and the like?
>
>Thanks for everybody's help and input on this matter.  It is greatly
>appreciated!!!
>
>
>
>Rob Alexander
>MCI Systemhouse
>ralexander AT shl DOT com
>