But you like to keep all your old drives too, right?
So not knowing, what nemonix really did, they probably just plugged in a
second SCSI controller into the system with something like 53c875,
and wrote additional drivers to access it ...
Hmm. I don't think Nemonix required any changes to the system, so I
would be surprised by a new driver. That said, it might just work like
the standard SCSI controller, so the standard driver would work.
And wide/fast SCSI can still deal with old/slow drives on the bus, so I
don't think you actually need a second controller. That could be the
only one and you could be happy. But I'm just making guesses.