Excerpt - Introduction
SOA – Where We Came From
For quite some time now, marketing shills have been preaching and selling SOA (Service Oriented
Architecture). Vast quantities of money have been poured into “The Next Big Thing.” Well, it is time to
ask a few questions and rain on their parade.
What is the Service Oriented Architecture? This is a re-hash of an old business model that played
itself out from the 1970s into the 1980s. Back then computers were multi-million-dollar
investments. Small to mid-sized companies simply couldn't afford them. Programmers were scarce
and qualified programmers even scarcer. Small to mid-sized companies could afford a few
thousand dollars for terminals and special modems. Then they spent several more thousand
dollars per month leasing time on computer systems. There were actually businesses that did little
more than lease time. They would also sell consulting services and lease access to some of their
applications.
Those of you who grew up with $20/month Internet access probably have a hard time imagining
someone paying thousands of dollars per month for access to a computer system, but it happened.
Commercial-class operating systems provided system and application run-time accounting. Among
other things they would measure the amount of computer time, connection time, and IO that each
user ID performed on the system. Every month the subscribing companies would be billed by the
CPU second, connection minute and block of IO. It shouldn't take a rocket scientist to do the math
here. One thousand customers paying $10K+/month to use your computer system paid off a $2
million price tag pretty quickly. Even 100 customers could make it viable if you were using the
computer system to run your own business. You bought the machine on time and they made the
payments for you.
Of course, the companies looking to lease time didn't have programmers (initially) and didn't have
applications, so those time-share businesses got into the custom software business. They had
proprietary data layouts that locked their clients into ever escalating support costs. It was like a drug
addiction you couldn't kick. (Sound familiar to those of you using stored procedures in a commercial
database?)
Mid-range computers came onto the scene. Many of the customers of mainframe time-share
systems opted to buy a mid-range computer for about 6-12 months worth of their time share cost.
Eventually, they too got into the custom application and time-share business, but not on as wide a
scale.
Then came the PC. Promising to put computing power in the hands of the people without any
regard for where that would lead. Vendors of hardware and software for these little boxes (for the
time anyway) made money hand over fist. Competition became cut-throat, and soon carcasses of
once proud vendor corporations littered the landscape. Companies had a rash of “desk drawer”
applications that were now required to keep their businesses functioning. Very little could
communicate effectively or exchange data reliably.
To stem the bloodshed, companies began focusing on networking technology. Multiple competing
proprietary networking protocols emerged. File servers and network application servers sprang up
all over the place. If you could afford the proprietary network interface equipment and the licensing,
you could all use the same applications and share data (in theory).
Greed set in even worse than before. It was nothing to end up paying well over $1,000 for a
network card to get a computer online. Sadly, you usually only paid about $3,000 for the PC to begin
with. Somewhere, in my souvenirs from the past, I have an ISA-based BiSync modem that operated
at a whopping 1200 baud. I paid just over $1,300 for it and it was a buy! The name brand version
was around $2,500 as I recall. The great part about these proprietary networking systems was that
they didn't talk to each other. Communicating across them required even more expensive bridging
software and dedicated hardware. Even when you had the networking people configuring your
machine in the office, you didn't always get network access. In their own weird way, the same
barriers people complained about provided a nearly unparalleled level of security. Networks were so
finicky to get working from the inside, hacking in from the outside was almost a myth.
Next came the TCP/IP standard, and the Internet. People wanted everything to connect to the Web.
Hackers now had a standardized medium to exploit and they took to it with zeal. PC prices dropped
dramatically and PCs started popping up all over the place. PC operating systems were (and still
are) so unstable and riddled with security holes that every application and project had to have its own
server. Servers started appearing around corporations like rabbits taking both Viagra and fertility
drugs. Suddenly companies found they were spending as much on these “cheap” systems as they
had been on the mainframes that took up less total space and consumed less power.
Enter the great server consolidation move. Completely disregard the fact your PC server OS is
unstable, requiring frequent rebooting and patching, taking the applications off-line. Load
virtualization software on one, and consolidate 8 or more into one machine. Uptime be damned!
Now when you have to reboot you can take out 8 or more servers.
One problem still remained though. Each application running on a server was pretty much its own
data island. Even when it stored its data in a database, that database was either on the same server
itself, or the database wasn't the same one used by other applications. Management had cost cut its
way into a very bitter pickle indeed.
Fear not though, the marketing shills had even more to sell them under the heading of “cutting
costs.” Management always listens intently to the “buy more to spend less” sales pitch. Repackage
these applications with this magic middleware (for an additional fee) and you can use pieces of
them, tying them together as you wish. They will all have a protocol to exchange data. You can use
order entry from this company, inventory management from that company, and if you buy today,
company three will sell you a piece of their picking ticket & truck loading module.
In fact, if you want to use it all from one vendor, it will work the best. No need to install their
applications, simply lease time on their machines. Get rid of all these pesky servers. Let someone
handle the updates and capacity issues for you. Vendor A has built a massive data center in a
single location with redundancy upon redundancy all in the same 40 acres. After all, the world is one
network now isn't it? Why should you keep buying all of this equipment, simply pay for the time you
use...
Sounds kind of familiar doesn't it? Pay by the application module, computer use and storage. If it
only ended there, it would be laughable. But it gets worse.
The Disaster We Are Headed Toward
What are they using to host all of this wonderful stuff? Racks and racks of PC-on-a-card servers.
Heat is a bigger problem for them than it was for the old mainframes. Some companies are now
looking into liquid cooling systems for those “personal computer” chips. Liquid cooling, just like
some of the big mainframes used.
What operating systems are they running? The same crummy operating systems that were
running at the client company. Security holes and patches are a seemingly daily if not hourly
occurrence, but the client companies are used to outages. Outages have become a business
standard.
What happens when one of those PC-on-a-card devices fries? Why, they load you up another one
at some point. Can't really say how long the outage will be, but you're used to it already. Sorry about
the transactions that were being processed, but you are used to losing those as well.
These faults can all be classified under the heading “Ignorance of a Cheap Mind.”
What cannot be classified under that heading, or even forgiven, is the packaging. These supposed
forward thinkers have all bought into the idea that one massive data center located on X acres some
place cheap is a good idea. What is even more unthinkable is that Congress is letting them do it.
I'm not talking about Congress being in control of business. I'm talking about Congress letting the
National Security Agency take these “industry leaders” into a dark alley with ball bats and cattle prods
to educate them on the finer points of economic and industry stability.
Let us assume for a moment that Congress is too busy getting re-elected to do anything useful.
(Admittedly, not a big assumption.) These data centers on steroids are allowed to prosper. They
have huge dollars behind them and drive out competitors so we have only a handful. Nah, let's
shrink the number. We end up with only three, just like we did with auto manufacturers years ago.
With greed coursing through their veins stronger than any narcotic on the market, they enter a cut-
throat competition just like the PC manufacturers did. Pretty soon, they've driven the price down to
just a couple thousand per month no matter how much you use. Talking heads at companies
around the country start chanting “cut costs” and looking in the direction of these “service providers.”
Yes, it's a financial Utopia all right.
In a need to differentiate themselves in this market, the “Big 3” buy up applications focusing on
specific market segments. One provides the best of the best in banking software. Soup to nuts
online checking, accounting, wire transfer, you-name-it-they-can-do-it banking product. Another ends
up focusing on the complete solution for manufacturing. We are talking order entry, inventory control,
sales force management, assembly line systems, shop floor control, the works. The last of the three
ends up providing best in class shipping logistics. From truck loading to routing, and everything in
between, they have modules to do it.
Ah, Utopia. They even develop a working relationship, so the manufacturing systems can use the
shipping logistics modules and they both use parts of the financial modules. It truly is bliss. This is
what marketing has promised and they finally delivered. Sort of...
No matter how you slice it, these providers spent heaps of money building up one location.
Usually where there was really cheap power. One of them ends up getting built well within the blast
radius of Mt. Rainier when it finally pops its top. (According to scientists within the next 20 years, but
they guessed a little long on Mt. St. Helens, so it is probably at the shallow end of the 20.) Another
gets built on a major fault line because power was half the price of anywhere else. The last gets
built in the low cost real estate district found near the end of major airport runways because they got
a sweet deal from the state and city governments.
It shouldn't be any surprise where this is heading. It doesn't matter how much power generation
and redundancy each location has built into it, they will be taken out, either for months or
permanently. A jet has engine trouble on take off and crashes, Mt. Rainier decides to prove the nay
sayers wrong, and that 8.2 quake finally does originate from the dormant fault line just like
geologists said it would eventually. In this day and age, we also have to deal with the possibility of a
terrorist group either crashing a jet or driving a truck load of homemade explosives into the site. Let
us not forget things like Katrina and the tsunami for the centers within a few miles of a coast line.
Once we get to a “Big 3” or even “Big 4” situation with these single location service centers, the
destruction of one, by any means, cripples a nation and quite possibly the world economy. PC and
UNIX people think only about loss of a single piece of equipment or power. Midrange developers
think about the loss of an entire facility.
Why We Are Headed There
Where we are headed is not good because of the premise which started it all. Actually, there were
multiple premises that lead us down this gilded path:
Cheap hardware lead to the PCs on Viagra and fertility drugs scenario. Well, that, and unstable
operating systems. Even IBM is running ads about servers being so numerous you cannot walk in a
building. While they are an exaggeration, they aren't off by much. Oddly enough, IBM marketed the
original IBM PC direct to businesses in the first place, so this is kind of like profiting from the sins of
your past.
Cheap operating systems. Gotta love that. I remember companies and people complaining about
spending $80 for DOS. At least with DOS, once you bought it, it was yours. Now Windows is moving
toward the “As soon as you stop paying for the service agreement your use license expires” model
with an initial rental price of around $300. Commercial flavors of UNIX had their own trappings when
it came to license agreements. Now people hold up Linux as the be all and end all. Only one
problem, none of these operating systems cluster correctly or well. They network, but do not cluster.
Even the Tru64 version of UNIX, released by the company that gave the world its first (and still only)
commercially viable clustered operating system didn't manage to get clustering working correctly in
UNIX. The problem is, you can't be loyal to the UNIX installed base and cluster. The platform is
missing critical pieces, and when those pieces are added, it won't be UNIX anymore, it will be a
clone of OpenVMS with some command syntax changes.
Flat monthly cost. Management loves the flat monthly cost model. Indeed, Internet access
providers and now cable phone providers are herding consumers towards that mentality.
Management loves it because they now only have one thing to look at when they sit around in a
talking heads meeting chanting “cut costs.” Leaves more time for the golf course.
A single massive data center. Now here is an idea straight from the 1970s. You have to be old to
remember it. The classic IBM mainframe data center. Raised floor to hide cabling, route air
conditioning, and provide a water trap. Bullet resistant glass wall so people could walk by and be
amazed by the equipment. Two to three layers of fire protection. Multiple lock entry security. In some
cases, even data center guards by the doors. Let's not forget the massive diesel engine generators
parked right outside the building and in later years the room full of UPS (Uninterruptable Power
Supply) equipment.
IBM was the originator of the “big iron” trend. It didn't cluster, but it did have it's own proprietary
networking for communications. As the platform progressed it also had machine partitioning. This
would let you divide up your “big iron” box so it looked like multiple mainframes to the outside world.
Sounds a lot like virtualization doesn't it? Big iron was big bucks. They didn't bother with clustering
technology because very few companies could afford to scatter a dozen or so of these around the
country. Instead, they put forth what became known as the “moat and fortress” data center design.
This lead to the bank teller bullet resistant glass plates and the other things we talked about. I never
really did figure out what the moat was, unless it was the raised floor or the fact many companies
were told to locate their data center on the second floor, not the first or the basement. They used to
get put in the basement because the equipment was so heavy, then someone thought about the
flooding issue.
DEC (Digital Equipment Corporation) focused primarily on the midrange market for mid-sized
companies. These were companies that could afford to spend one half to two million for their entire
data center and computer system. The companies knew they needed a computer system to
compete and keep growing, but they couldn't bite the bullet for a multi-million-dollar mainframe
setup. As the companies ran more efficiently with the computer system they kept finding more and
more uses for it. For a time they bought bigger and bigger boxes, but the engineers at DEC came up
with an even better solution. Buy more of the same and hook them all together so files, batch jobs,
users and processing power could be utilized throughout a cluster of computers. As
communications improved worldwide, these clusters, literally spanned the globe.
The Roots of SOA
Both DEC and IBM hit on the need for transaction management. IBM created CICS (Customer
Information Control System) and DEC created ACMS (Application Control Management System).
Both of these were and still are amazing products. ACMS had the most far reaching implications, yet
few realized it. Sadly, much of the market missed it.
While the concept will be completely foreign to those coming from the PC and UNIX sides of life,
these systems allowed you to both package functions for a Service Oriented Architecture and
provided guaranteed execution. A side effect was that each SOA task you created with them had a
messaging format that did not allow for data overrun or SQL injection like the current Web fiascoes.
Yes, there are many third-party messaging systems these days making claims about guaranteed
message delivery, but none will go so far as to guarantee its execution.
Because ACMS was the most far reaching and the one I have the most experience with, we will be
discussing ACMS combined with clustering in this book.
Additional Reading
If you like the style and content of this book, or would simply like to learn more about application
development on OpenVMS, please pick up copies of “The Minimum You Need to Know to Be an
OpenVMS Application Developer” ISBN 0-97708660-7. You can follow it up with “The Minimum You
Need to Know about Java on OpenVMS Volume 1” ISBN 0-9770866-1-5 ISBN-13 978-0-9770866-
1-0.
At some point “The Minimum You Need to Know About Logic to Work in IT” will be available as
well. This is not an OpenVMS specific book, but meant to be used as a textbook to teach those new
to IT about logic. It appears today's graduates haven't the foggiest clue about it.
ISBN 0-9770866-2-3 ISBN-13 978-0-9770866-2-7.
For quite some time now, marketing shills have been preaching and selling SOA (Service Oriented
Architecture). Vast quantities of money have been poured into “The Next Big Thing.” Well, it is time to
ask a few questions and rain on their parade.
What is the Service Oriented Architecture? This is a re-hash of an old business model that played
itself out from the 1970s into the 1980s. Back then computers were multi-million-dollar
investments. Small to mid-sized companies simply couldn't afford them. Programmers were scarce
and qualified programmers even scarcer. Small to mid-sized companies could afford a few
thousand dollars for terminals and special modems. Then they spent several more thousand
dollars per month leasing time on computer systems. There were actually businesses that did little
more than lease time. They would also sell consulting services and lease access to some of their
applications.
Those of you who grew up with $20/month Internet access probably have a hard time imagining
someone paying thousands of dollars per month for access to a computer system, but it happened.
Commercial-class operating systems provided system and application run-time accounting. Among
other things they would measure the amount of computer time, connection time, and IO that each
user ID performed on the system. Every month the subscribing companies would be billed by the
CPU second, connection minute and block of IO. It shouldn't take a rocket scientist to do the math
here. One thousand customers paying $10K+/month to use your computer system paid off a $2
million price tag pretty quickly. Even 100 customers could make it viable if you were using the
computer system to run your own business. You bought the machine on time and they made the
payments for you.
Of course, the companies looking to lease time didn't have programmers (initially) and didn't have
applications, so those time-share businesses got into the custom software business. They had
proprietary data layouts that locked their clients into ever escalating support costs. It was like a drug
addiction you couldn't kick. (Sound familiar to those of you using stored procedures in a commercial
database?)
Mid-range computers came onto the scene. Many of the customers of mainframe time-share
systems opted to buy a mid-range computer for about 6-12 months worth of their time share cost.
Eventually, they too got into the custom application and time-share business, but not on as wide a
scale.
Then came the PC. Promising to put computing power in the hands of the people without any
regard for where that would lead. Vendors of hardware and software for these little boxes (for the
time anyway) made money hand over fist. Competition became cut-throat, and soon carcasses of
once proud vendor corporations littered the landscape. Companies had a rash of “desk drawer”
applications that were now required to keep their businesses functioning. Very little could
communicate effectively or exchange data reliably.
To stem the bloodshed, companies began focusing on networking technology. Multiple competing
proprietary networking protocols emerged. File servers and network application servers sprang up
all over the place. If you could afford the proprietary network interface equipment and the licensing,
you could all use the same applications and share data (in theory).
Greed set in even worse than before. It was nothing to end up paying well over $1,000 for a
network card to get a computer online. Sadly, you usually only paid about $3,000 for the PC to begin
with. Somewhere, in my souvenirs from the past, I have an ISA-based BiSync modem that operated
at a whopping 1200 baud. I paid just over $1,300 for it and it was a buy! The name brand version
was around $2,500 as I recall. The great part about these proprietary networking systems was that
they didn't talk to each other. Communicating across them required even more expensive bridging
software and dedicated hardware. Even when you had the networking people configuring your
machine in the office, you didn't always get network access. In their own weird way, the same
barriers people complained about provided a nearly unparalleled level of security. Networks were so
finicky to get working from the inside, hacking in from the outside was almost a myth.
Next came the TCP/IP standard, and the Internet. People wanted everything to connect to the Web.
Hackers now had a standardized medium to exploit and they took to it with zeal. PC prices dropped
dramatically and PCs started popping up all over the place. PC operating systems were (and still
are) so unstable and riddled with security holes that every application and project had to have its own
server. Servers started appearing around corporations like rabbits taking both Viagra and fertility
drugs. Suddenly companies found they were spending as much on these “cheap” systems as they
had been on the mainframes that took up less total space and consumed less power.
Enter the great server consolidation move. Completely disregard the fact your PC server OS is
unstable, requiring frequent rebooting and patching, taking the applications off-line. Load
virtualization software on one, and consolidate 8 or more into one machine. Uptime be damned!
Now when you have to reboot you can take out 8 or more servers.
One problem still remained though. Each application running on a server was pretty much its own
data island. Even when it stored its data in a database, that database was either on the same server
itself, or the database wasn't the same one used by other applications. Management had cost cut its
way into a very bitter pickle indeed.
Fear not though, the marketing shills had even more to sell them under the heading of “cutting
costs.” Management always listens intently to the “buy more to spend less” sales pitch. Repackage
these applications with this magic middleware (for an additional fee) and you can use pieces of
them, tying them together as you wish. They will all have a protocol to exchange data. You can use
order entry from this company, inventory management from that company, and if you buy today,
company three will sell you a piece of their picking ticket & truck loading module.
In fact, if you want to use it all from one vendor, it will work the best. No need to install their
applications, simply lease time on their machines. Get rid of all these pesky servers. Let someone
handle the updates and capacity issues for you. Vendor A has built a massive data center in a
single location with redundancy upon redundancy all in the same 40 acres. After all, the world is one
network now isn't it? Why should you keep buying all of this equipment, simply pay for the time you
use...
Sounds kind of familiar doesn't it? Pay by the application module, computer use and storage. If it
only ended there, it would be laughable. But it gets worse.
The Disaster We Are Headed Toward
What are they using to host all of this wonderful stuff? Racks and racks of PC-on-a-card servers.
Heat is a bigger problem for them than it was for the old mainframes. Some companies are now
looking into liquid cooling systems for those “personal computer” chips. Liquid cooling, just like
some of the big mainframes used.
What operating systems are they running? The same crummy operating systems that were
running at the client company. Security holes and patches are a seemingly daily if not hourly
occurrence, but the client companies are used to outages. Outages have become a business
standard.
What happens when one of those PC-on-a-card devices fries? Why, they load you up another one
at some point. Can't really say how long the outage will be, but you're used to it already. Sorry about
the transactions that were being processed, but you are used to losing those as well.
These faults can all be classified under the heading “Ignorance of a Cheap Mind.”
What cannot be classified under that heading, or even forgiven, is the packaging. These supposed
forward thinkers have all bought into the idea that one massive data center located on X acres some
place cheap is a good idea. What is even more unthinkable is that Congress is letting them do it.
I'm not talking about Congress being in control of business. I'm talking about Congress letting the
National Security Agency take these “industry leaders” into a dark alley with ball bats and cattle prods
to educate them on the finer points of economic and industry stability.
Let us assume for a moment that Congress is too busy getting re-elected to do anything useful.
(Admittedly, not a big assumption.) These data centers on steroids are allowed to prosper. They
have huge dollars behind them and drive out competitors so we have only a handful. Nah, let's
shrink the number. We end up with only three, just like we did with auto manufacturers years ago.
With greed coursing through their veins stronger than any narcotic on the market, they enter a cut-
throat competition just like the PC manufacturers did. Pretty soon, they've driven the price down to
just a couple thousand per month no matter how much you use. Talking heads at companies
around the country start chanting “cut costs” and looking in the direction of these “service providers.”
Yes, it's a financial Utopia all right.
In a need to differentiate themselves in this market, the “Big 3” buy up applications focusing on
specific market segments. One provides the best of the best in banking software. Soup to nuts
online checking, accounting, wire transfer, you-name-it-they-can-do-it banking product. Another ends
up focusing on the complete solution for manufacturing. We are talking order entry, inventory control,
sales force management, assembly line systems, shop floor control, the works. The last of the three
ends up providing best in class shipping logistics. From truck loading to routing, and everything in
between, they have modules to do it.
Ah, Utopia. They even develop a working relationship, so the manufacturing systems can use the
shipping logistics modules and they both use parts of the financial modules. It truly is bliss. This is
what marketing has promised and they finally delivered. Sort of...
No matter how you slice it, these providers spent heaps of money building up one location.
Usually where there was really cheap power. One of them ends up getting built well within the blast
radius of Mt. Rainier when it finally pops its top. (According to scientists within the next 20 years, but
they guessed a little long on Mt. St. Helens, so it is probably at the shallow end of the 20.) Another
gets built on a major fault line because power was half the price of anywhere else. The last gets
built in the low cost real estate district found near the end of major airport runways because they got
a sweet deal from the state and city governments.
It shouldn't be any surprise where this is heading. It doesn't matter how much power generation
and redundancy each location has built into it, they will be taken out, either for months or
permanently. A jet has engine trouble on take off and crashes, Mt. Rainier decides to prove the nay
sayers wrong, and that 8.2 quake finally does originate from the dormant fault line just like
geologists said it would eventually. In this day and age, we also have to deal with the possibility of a
terrorist group either crashing a jet or driving a truck load of homemade explosives into the site. Let
us not forget things like Katrina and the tsunami for the centers within a few miles of a coast line.
Once we get to a “Big 3” or even “Big 4” situation with these single location service centers, the
destruction of one, by any means, cripples a nation and quite possibly the world economy. PC and
UNIX people think only about loss of a single piece of equipment or power. Midrange developers
think about the loss of an entire facility.
Why We Are Headed There
Where we are headed is not good because of the premise which started it all. Actually, there were
multiple premises that lead us down this gilded path:
- Running core business systems on feeble operating systems was OK because the
hardware was cheap. - Using operating systems which cannot cluster completely is OK when they are cheap.
- Replacing existing systems with a flat monthly fee service was a great way of cutting costs.
- Building a single massive location to do everything and get economies of scale was a good
idea.
Cheap hardware lead to the PCs on Viagra and fertility drugs scenario. Well, that, and unstable
operating systems. Even IBM is running ads about servers being so numerous you cannot walk in a
building. While they are an exaggeration, they aren't off by much. Oddly enough, IBM marketed the
original IBM PC direct to businesses in the first place, so this is kind of like profiting from the sins of
your past.
Cheap operating systems. Gotta love that. I remember companies and people complaining about
spending $80 for DOS. At least with DOS, once you bought it, it was yours. Now Windows is moving
toward the “As soon as you stop paying for the service agreement your use license expires” model
with an initial rental price of around $300. Commercial flavors of UNIX had their own trappings when
it came to license agreements. Now people hold up Linux as the be all and end all. Only one
problem, none of these operating systems cluster correctly or well. They network, but do not cluster.
Even the Tru64 version of UNIX, released by the company that gave the world its first (and still only)
commercially viable clustered operating system didn't manage to get clustering working correctly in
UNIX. The problem is, you can't be loyal to the UNIX installed base and cluster. The platform is
missing critical pieces, and when those pieces are added, it won't be UNIX anymore, it will be a
clone of OpenVMS with some command syntax changes.
Flat monthly cost. Management loves the flat monthly cost model. Indeed, Internet access
providers and now cable phone providers are herding consumers towards that mentality.
Management loves it because they now only have one thing to look at when they sit around in a
talking heads meeting chanting “cut costs.” Leaves more time for the golf course.
A single massive data center. Now here is an idea straight from the 1970s. You have to be old to
remember it. The classic IBM mainframe data center. Raised floor to hide cabling, route air
conditioning, and provide a water trap. Bullet resistant glass wall so people could walk by and be
amazed by the equipment. Two to three layers of fire protection. Multiple lock entry security. In some
cases, even data center guards by the doors. Let's not forget the massive diesel engine generators
parked right outside the building and in later years the room full of UPS (Uninterruptable Power
Supply) equipment.
IBM was the originator of the “big iron” trend. It didn't cluster, but it did have it's own proprietary
networking for communications. As the platform progressed it also had machine partitioning. This
would let you divide up your “big iron” box so it looked like multiple mainframes to the outside world.
Sounds a lot like virtualization doesn't it? Big iron was big bucks. They didn't bother with clustering
technology because very few companies could afford to scatter a dozen or so of these around the
country. Instead, they put forth what became known as the “moat and fortress” data center design.
This lead to the bank teller bullet resistant glass plates and the other things we talked about. I never
really did figure out what the moat was, unless it was the raised floor or the fact many companies
were told to locate their data center on the second floor, not the first or the basement. They used to
get put in the basement because the equipment was so heavy, then someone thought about the
flooding issue.
DEC (Digital Equipment Corporation) focused primarily on the midrange market for mid-sized
companies. These were companies that could afford to spend one half to two million for their entire
data center and computer system. The companies knew they needed a computer system to
compete and keep growing, but they couldn't bite the bullet for a multi-million-dollar mainframe
setup. As the companies ran more efficiently with the computer system they kept finding more and
more uses for it. For a time they bought bigger and bigger boxes, but the engineers at DEC came up
with an even better solution. Buy more of the same and hook them all together so files, batch jobs,
users and processing power could be utilized throughout a cluster of computers. As
communications improved worldwide, these clusters, literally spanned the globe.
The Roots of SOA
Both DEC and IBM hit on the need for transaction management. IBM created CICS (Customer
Information Control System) and DEC created ACMS (Application Control Management System).
Both of these were and still are amazing products. ACMS had the most far reaching implications, yet
few realized it. Sadly, much of the market missed it.
While the concept will be completely foreign to those coming from the PC and UNIX sides of life,
these systems allowed you to both package functions for a Service Oriented Architecture and
provided guaranteed execution. A side effect was that each SOA task you created with them had a
messaging format that did not allow for data overrun or SQL injection like the current Web fiascoes.
Yes, there are many third-party messaging systems these days making claims about guaranteed
message delivery, but none will go so far as to guarantee its execution.
Because ACMS was the most far reaching and the one I have the most experience with, we will be
discussing ACMS combined with clustering in this book.
Additional Reading
If you like the style and content of this book, or would simply like to learn more about application
development on OpenVMS, please pick up copies of “The Minimum You Need to Know to Be an
OpenVMS Application Developer” ISBN 0-97708660-7. You can follow it up with “The Minimum You
Need to Know about Java on OpenVMS Volume 1” ISBN 0-9770866-1-5 ISBN-13 978-0-9770866-
1-0.
At some point “The Minimum You Need to Know About Logic to Work in IT” will be available as
well. This is not an OpenVMS specific book, but meant to be used as a textbook to teach those new
to IT about logic. It appears today's graduates haven't the foggiest clue about it.
ISBN 0-9770866-2-3 ISBN-13 978-0-9770866-2-7.
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