MicroVax II/VMS - why 70mb isn't enough.

Ethan Dicks ethan.dicks at gmail.com
Mon Aug 20 08:07:25 CDT 2007

On 8/20/07, Mr Ian Primus <ian_primus at yahoo.com> wrote:
> For all those that asked - I was trying to install VMS
> 7.2. Obviously, an older version would have had a
> better time fitting, but this is the only version we
> had available. I was just realliy suprised that the
> installer claimed that it would fit with 10000 blocks
> to spare, and then promptly ran out of space.

That's probably a faulty assumption (or perhaps a real bug) in the
installer script.

> It makes
> sense - VMS pages to a file on the disk, and any
> unpacking routine would use disk, but, oh well. Live
> and learn.

>From http://h18000.www1.hp.com/info/spd/

(OpenVMS 7.2 SPD)

On page 26, it claims the minimum base OS for VAX is 32MB, but there
are lots of optional and non-optional extras.  I don't know what the
install script assumes, but the base OS plus page file plus "variable
additional space" (INDEXF.SYS, etc.) is around 40MB.  That doesn't
count working space for unpacked savesets, default swap and dump
files, etc., or the "optional" files that aren't really so optional.

A "full" install is around 150MB, and indeed, the sample disk sizes
were calculated from an install on a VAXserver 2000 w/6MB (RAM size
affects calculated page and swap and dump sizes) and an RD54 (the
largest disk supported inside a VS2K).

There's a thought... cut your physical memory back... then the install
script won't create such large page and swap files (and tell it not to
create a dump file).  That might give you a bit more room.

> I did some digging here and found a 300 mb ESDI disk.
> I have no idea if it works or not, I'll give it a shot
> as soon as I have a chance.

Good luck with that.  You should find it plenty large enough.

> With regards to booting - has anyone used mopd on
> Linux to install VMS? I am wondering if it's possible
> to build up a Linux box to act as an InfoServer (I
> don't have one, Sridhar does).

I have not, but if I did try it, I would begin by expecting it to
work.  Obviously confirmation from someone who has done it is very

> Also, does anyone have a Qbus DSSI controller that
> needs a home? <grin>

Nope.  Sorry.  I've never worked with DSSI.  I had a DSSI pedestal a
while back, but I gave it to another list member in Columbus.


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