The KZQSA is a simple SCSI interface.  Folks keep saying that it's slow - but 
I've run "benchmarks" on load time for VMS - and it runs as fast as other 
more "sophisticated" SCSI interfaces, like the Enulex UC07 which has 
buffering, etc.  I would say it runs as fast or faster than the "native" DSSI 
drives (primarily because you can use SCSI drives with better seek time ;-)

Note that if you are doing database work, then there will be more of a 
difference because of it's lack of buffering, etc.

In addtion, the KZQSA is limited to a two SCSI drive "load" - and DEC is not 
kidding - I've tried more drives and it becomes error prone.

Typically, I've only used a KZQSA as the boot SCSI (CDROM/HDD) for VMS, as it 
is simple and convenient.

Note: The above observations are for a VAX 4000/300 and VAX 4000/600 running 
the recent version(s) of VMS for VAX.

Lyle

On Friday 09 January 2004 10:56, Lord Isildur wrote:
> no, i don't think the KZQSA speaks MSCP.. i think it is a much dumber
> interface, something makes me think it is like the sii. it is also _very_
> slow compared to other interfaces.
>
> Isildur
>
> On Thu, 8 Jan 2004 ragge@ludd.luth.se wrote:
> > > Hey guys
> > >
> > > What's the status of KZQSA support? I've been watching a thread over on
> > > classiccmp about it and 4000-series machines can boot from it - does
> > > NetBSD have driver support for it so that I could boot from a disk
> > > hanging off one on a 4200?
> >
> > KZQSA, isn't that the DEC QBUS MSCP-speaking SCSI adapter?
> > In that case it should just work.
> >
> > -- Ragge

-- 
Lyle Bickley
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"