> Date: Tue, 12 Jun 2001 03:01:44 -0400 (EDT)
> From: der Mouse <mouse@Rodents.Montreal.QC.CA>
> To: port-vax@netbsd.org
> Subject: Re: How do I get VMS (ducking now)
> 
> >> [... SCSI drives ...]
> 
> > OpenVMS uses the console I/O routines to access the disk during
> > bootup and shutdown (crash).  Those routines (in PROM) cannot access
> > beyond 1.073GB (if you try they wrap around ... not nice).
> 
> How...bizarre.  What on earth produces that limit?  I've seen Suns with
> a somewhat similar limit, but in their case it strikes right at the 1G
> mark (it's because they always use 6-byte CDBs, which can't address
> blocks past 0x1fffff, which is the 1G point).  Even doing things with
> transfers starting at 0x1fffff doesn't explain it, unless your transfer
> size is at least some 74M, which is implausible.

Same thing.  6-byte SCSI command blocks.

The definition of "GB" is somewhat variable from place to place.  10^9
or 2^10 * 10^6 or 2^20 * 10^3 or 2^30.  There's a 2.4% size change each
time you move from one definition to the next.  :-)

    carl

        carl lowenstein         marine physical lab     u.c. san diego
                                                  clowenstein@ucsd.edu