SCSI tape changer quirkiness: Dell PV132T and SMS_DBD bit
The Dell PV132T tape library's changer apparently used to expect the
SMS_DBD bit to be _set_ in Mode Sense requests, or it just sulks, see
link  and dmesg excerpt  below. This was incorrect behaviour on
its part, AFAIK.
So, I began to imagine some sort of a SDEV_MSDBDON SCSI quirk, but
turns out it's fixed by latest firmware. Upgrading firmware of the
tape library to the recently released 310D (Dell support file:
R121419.EXE of 2006-06-20) fixes it .
Probably not worth worrying about to the extent of adding a quirk for
now-obsolete firmware, but figured I should report it as someone else
might well be trying to use the device with OpenBSD: OpenBSD after all
is quite a likely choice for a trusted backup server.