LTO3 tape drive not detected

[Joe in MPLS]

This was originally posted on the freebsd-questions list. It was
suggested that I post it here:

I have FreeBSD 8.2-RELEASE running on an HP DL360 G5. I recently added
an (HP branded) LSI Logic single channel SCSI 320 card and attached an
HP Ultrium 920 LTO3 tape drive.

The system sees the SCSI controller as mpt0, and it seems to know
there's something at SCSI ID 4, but I get an "AutoSense Failed" for
hba/id/lun 0:4:0 at boot and subsequent camcontrol rescans.

I checked the supported hardware doc for the release but it doesn't get
very specific about tape drives. This is my first experience with LTO3
tape. I was hoping that I'd automagically get a /dev/sa0 device like I
always did with my old DLT drives but it wasn't to be this time.

Is there a way to make this drive work?

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[Matthew Jacob]

Hmm, haven't had real drives to play with in a while, and don't recall
ever attaching one through an MPT. Do you have another SCSI adapter?

Autosense fail for mpt means that the MPT controller firmware was unable
to retrieve sense data for a command. We just give up on that.

You might get into the MPT BIOS settings and set narrow/async for the
device just to see if that will work.