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We've deployed SimH VAX commercially, so you should be fine:<br><br>
<a href="http://www.migrationspecialties.com/pdf/SimH_MAN.pdf" eudora="autourl">
http://www.migrationspecialties.com/pdf/SimH_MAN.pdf</a><br><br>
I've left FreeAXP, an Alpha emulator, running on a Atom processor for
over a week with no issues, so SimH should be comfortable there as
well. Performance will not be blazing fast, but it should be
sufficient.<br><br>
Take Dave's advice and avoid using the wireless NIC for the
emulator. Save it for the host O/S traffic.<br><br>
Bruce C.<br>
<a href="http://www.migrationspecialties.com/" eudora="autourl">
www.MigrationSpecialties.com<br><br>
<br>
</a>At 02:56 PM 6/9/2010, Zane H. Healy wrote:<br><br>
<br>
<blockquote type=cite class=cite cite="">On Wed, 9 Jun 2010, Marc
Chametzky wrote:<br><br>
> I can give some input from my experience on a few of these
things...<br><br>
Thank you, it tends to indicate what I am considering is doable.<br><br>
>> Does anyone happen to know what kind of performance this would
give?<br>
>> How many VUPS would such a setup offer?<br>
><br>
> I don't know how it would perform on your system as I'm not familiar
with the <br>
> performance characteristics of the Atom processor. On my SIMH setup,
which is <br>
> a virtualized Linux system running on an ESXi host using an AMD
Phenom II X3 <br>
> 710 processor (limited to 2 GHz on a single processor), I get 13
VUPs (using <br>
> SRI's PT_VAX.EXE).<br><br>
I've no idea what that CPU is, as I'm not familiar with AMD products, but
a<br>
quick google would seem to indicate that's more than 3x the CPU
power. Of<br>
course the Atom isn't designed for this sort of workload. Even if
it isn't<br>
practical to run WASD, I could still do pretty much everything else on
SIMH.<br><br>
> I will note that I got better idle handling once I started running
DECnet. I <br>
> think that SIMH dealt better when there was some occasional activity
(such as <br>
> handling network packets) rather than a truly idle system.<br><br>
It would definitely be running DECnet Phase IV, as I'd want to be able
to<br>
talk to my PDP-11's, and have it on HECnet.<br><br>
>> I assume that Volume Shadowing is supported, so that I can place
disk <br>
>> images<br>
>> on seperate physical hard drives and turn on shadowing?<br>
><br>
> That should work just fine. There might be an issue with SIMH
working <br>
> properly if one of its virtual drive volumes becoming unavailable,
though, so <br>
> an advantage of volume shadowing (system reliability) probably goes
away.<br><br>
My thought was to have redundancy should I loose a physical HD.
Which is<br>
why I use Volume Shadowing on my Alpha.<br><br>
>> What about<br>
>> clustering with real physical VMS systems if I desire it?<br>
><br>
> I've done it in the past using SIMH VAX clustered with a hardware
Alpha box. <br>
> It worked just fine.<br><br>
Perfect, as if I were to use it, I'd want to be able to cluster with
a<br>
MicroVAX III and an Alpha at a minimum.<br><br>
>> How large of<br>
>> virtual disks does SIMH support?<br>
><br>
> Big. :-) Using a command like "set rqb0 rauser=N" in
vax.ini, I'm able to use <br>
> large drives including one that's 15 GB. I did need to tweak my
sources in <br>
> order to get large volumes working properly at some point in the
past (an <br>
> issue with the large file APIs), but that was some time ago and I
don't <br>
> recall whether it was still needed with the current
sources.<br><br>
My Alpha currently runs with 3 36GB drives, and 1 50GB drive.
Though I<br>
could trim down the required space.<br><br>
Zane<br><br>
<br>
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<x-sigsep><p></x-sigsep>
<br>
Mr. Bruce Claremont, Software Preservationist<br>
Migration Specialties International, Inc.<br>
217 West 2nd Street, Florence, CO 81226-1403<br>
Bruce.Claremont@MigrationSpecialties.com<br>
<a href="http://www.migrationspecialties.com/" eudora="autourl">
www.MigrationSpecialties.com<br>
</a>+1 719-371-1711, Fax: +1 888-854-3417 <br><br>
Get your free Alpha emulator at
<a href="http://www.freeaxp.com/">www</a>
<a href="http://www.freeaxp.com/">.FreeAXP.com</a>.<br><br>
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