I had the same problem with my system:
P100
Aha 2940
LB-IDE

Micropolis 1991 SCSI
Conner cfs1275a IDE

Seems like when I changed MAXBSIZE to MAXPHYS I was unable to boot 
(dumped into the debugger) and when I changed MAXBSIZE to 32768, the
system hung while trying to access the IDE drive. The system boots on the 
IDE drive.

-jeff

On Tue, 14 Nov 1995, Randy Terbush wrote:

> 
> Another which did not make it....
> 
> 
> ------- Forwarded Message
> 
> To: current-users@netbsd.org
> Subject: Re: MAXBSIZE should be MAXPHYS; a yes vote! 
> In-reply-to: greywolf's message of Fri, 10 Nov 1995 10:00:27 -0800.
>          <9511101800.AA20325@defender.vas.viewlogic.com> 
> X-uri: http://www.zyzzyva.com/
> Mime-Version: 1.0
> Content-Type: text/plain; charset=us-ascii
> Date: Sat, 11 Nov 1995 09:48:45 -0600
> From: Randy Terbush <randy@zyzzyva.com>
> 
> 
> Regarding this suggested change, my system will not boot with
> MAXBSIZE = 32768;
> 
> P133
> Buslogic 946C
> HP2247 1GB SCSI drive
> 64MB RAM
> 
> Consider my vote a no.
> 
> 
> 
> 
> ------- End of Forwarded Message
> 
> 
> 
>