OpenVMS Mini FAQ
(From real questions I get all the time)
Overview: In mid 2005, I spent a week at
Learning Tree in Toronto which meant I
got a chance to mingle with computer professionals outside of the OpenVMS world.
Most people I met were either "UNIX acolytes" or "Windows wonks".
About 90% knew about VAX, VMS; About 75% mistakenly thought VMS was dying or was
already dead; Only my instructor had heard the phrase "OpenVMS". So I
wrote this Mini-FAQ based mostly upon coffee-break questions of that week.
I have decided to keep the FAQ very general and less than 10 questions.
Edit: 2009-09-26 (fixed some grammar)
Questions and Answers
- What is the difference between VMS and OpenVMS?
Nothing. Due to customer requests, VMS source code was opened-up
to paying customers around the same time it was ported from 32-bit VAX to 64-bit
Alpha (~1992). At that time, the product name and version numbers flowed from
VMS-5.5-2 to OpenVMS-6.2. The most recent (2008) version is
OpenVMS-8.3, which contains some cool stuff including support for Intel's
most recent true 64-bit CPU called
- Do I need to port any code when going from "VMS
on VAX" to "OpenVMS on VAX"?
No because the two names represent the same OS but anytime
you consider jumping a major OS version number you should always check with
the vendor of your application software. If you authored your own software and
still posses the source code then a simple recompile then link should solve
99% of most problems (but always do a trial port first). Going from VAX to Alpha
is only a tiny bit more complicated but is a no-brainer if you have access to
your source code.
A diary of my VAX to Alpha ports:
- I thought OpenVMS was going to be shut down.
No. This misconception started when Compaq announced the end
of the "VAX hardware" line in the last quarter of 2000. When
VMS was first released 1977, it only ran on the 32-bit VAX hardware line, so
many IS/IT people from that era cannot think about VMS without also thinking
about VAX. In 1992, Digital started manufacturing 64-bit Alpha hardware and
supported OpenVMS on both platforms.
- So how many hardware platforms does OpenVMS (natively)
Three for sure, possibly
- VAX (32-bit CISC)
Even though no new
VAX machines are being manufactured,
OpenVMS is still being supported on VAX by HP.
- Alpha (64-bit RISC)
Alpha systems will
be manufactured after December-2006 but HP still plans to support OpenVMS
on Alpha up to the end of 2011. Maybe longer depending upon customer demand.
- Itanium2 (64-bit EPIC)
This is Intel's
latest dream chip for competition with IBM's POWER/PowerPC line and Sun's
Ultra SPARC. Note that Itanium
will be targeted at the server market, which is why many consumers have
never heard of it. One implementation of Itanium is designed to execute
up to three 64-bit instruction streams in parallel so stating that
Itanium is 64-bit is really a misnomer. In this case, it is really 192 bit.
p.s. note that HP uses the name Integrity in the product names
rather than Itanium
- x86-64 (EM64T and/or AMD64)
is a rumor that never goes away. No one from OpenVMS Engineering has
ever stated that they were porting OpenVMS to
x86-64 but this rumor
still persists. In addition, the popularity of Pentium compatible technology
combined with the fact that it continues to be more powerful every year
would make this rumor seem plausible.
Contrary to popular belief, EM64T and AMD64 are true 64-bit CPUs. Registers
ps-2: in the late 1980's DEC
(Digital Equipment Corporation) did begin a trial port of VMS to x86 under
the project names of
and PRISM. When this
project was cancelled, one of the project primes (Dave
Cutler) resurrected it for Bill Gates at Microsoft. This resulted in
a product known as Windows-NT (new technology) which later became products
like: Windows-2000, Windows-XP, Windows 2003 Server, Windows-Vista, Windows-7,
etc. I only mention this to prove that the porting rumor may not be so far
ps-3: check out this private site for some
- How is OpenVMS business doing in a world dominated
by hype from Windows/UNIX/LINUX?
Since HP merged with Compaq in 2002, the OpenVMS business has been growing world
wide by 10-12% per year. Since we are talking about an annual gross amount in
excess of 4 billion dollars, these numbers are not something to be ignored.
(Observation: the biggest demand for OpenVMS technology is currently coming
from Europe. I find this strange since Europe is the birthplace of LINUX).
- Prove to me that OpenVMS is not dying.
In 2005, Oracle released "Oracle 10g For OpenVMS on Alpha".
Oracle Corporation has never been known to waste money on foolish ventures.
On top of that, they still make a ton of money developing and supporting
Oracle-RDB on VAX, Alpha, and Itanium.
- What about all the freeware Open Source software
in the public domain? Doesn't most of it only run on Windows or UNIX?
Most of it only runs on UNIX and has been ported to other platforms
including Windows. OpenVMS does support a UNIX "compatibility API (application
programming interface)" which is used to run many UNIX applications like
and MySQL with little,
or no, modification.
- How does OpenVMS compare to UNIX and/or LINUX?
First off, UNIX is almost 8 years older than VMS although they were
developed in the same decade. Although LINUX is much newer UNIX-like product,
it is not a new operating system. In fact, it is just BSD UNIX applications
with a totally rewritten kernel. Click here
for a side-by-side comparison. All modern operating systems support Symmetric
Multi Processing (SMP) but OpenVMS is still the industry leader in
What the UNIX world calls "a cluster" is no where close to what is
happening in an OpenVMS Cluster.
HP is (understandably) unwilling to
increase OpenVMS sales by relating to a horrible human tragedy so let me publish
something which HP will not:
There were more than a few OpenVMS
clusters running in the World Trade Towers on 9/11 (unfortunately, some
clusters were composed of nodes only found in buildings one and two).
Some European financial businesses operated OpenVMS Clusters with at
least one node in one of the Twin Towers with another located elsewhere,
like New Jersey.
These European businesses was very surprised as
they watched the towers fall on TV but never saw their OpenVMS clusters
drop any transactions.
Official HP information:
Kitchener - Waterloo - Cambridge,