Difference between MVS/XA and MVS/ESA in mainframes?

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Angel
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Difference between MVS/XA and MVS/ESA in mainframes?

Post by Angel » Mon Dec 30, 2013 12:32 am

Hi,

What is the difference between MVS/XA and MVS/ESA in mainframes? Can they both be available on a single mainframe?



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Robert Sample
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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Robert Sample » Mon Dec 30, 2013 3:00 am

MVS/XA was the first 31-bit MVS operating system. It was later replaced by MVS/ESA in 1988, then by OS/390 in 1995. While either should run in an LPAR on a mainframe, I have not verified this myself. Furthermore, it would be unlikely to have them both running on a single machine since neither has been supported for many years.



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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Angel » Tue Dec 31, 2013 4:42 pm

Thanks Robert.

So they are basically based upon the same architecture and MVS/ESA is a successor of MVS/XA?



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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Robert Sample » Tue Dec 31, 2013 5:34 pm

The basic architecture of IBM mainframes dates back to 1964 and the System/360. While this architecture has been extended considerably since then, programs that ran on a 360/30 machine under OS/360 or DOS/360 back then can still be run today on a zEnterprise machine running z/OS. MVS/XA extended the 24-bit addressing to 31-bit addressing; z/OS later extended this (again) to 64-bit addressing. If you seriously want to know more about MVS/XA and MVS/ESA, you need to use Google (or your favorite search engine) and start reading. IBM has used many names for their operating systems over the years as features have been added; MVS/XA and MVS/ESA were merely two of them.



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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Angel » Mon Jan 20, 2014 1:41 pm

Thanks for the direction Robert. Mainframe's information is too wide...




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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by dick scherrer » Wed Jan 22, 2014 2:33 am

Mainframe info is Very wide, but for most people the history is just that - history.

Handy for some trivia type questions, but currently not running in a productno environment.

One way to run both on the same computer is to run a VM host with multiple "guests".


Hope this helps,
d

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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Angel » Thu Feb 06, 2014 6:56 pm

dick scherrer wrote:One way to run both on the same computer is to run a VM host with multiple "guests".
I did not get you dick?




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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by dick scherrer » Fri Feb 14, 2014 3:22 am

There is another manframe operating system called VM (Virtual Machine). If this is the host software, other "guest" host operating systems may be run on that same system, allowing multiple "mainframes" with different operating systems to run at the same time.

This is probably not something you will use unless it is part of your environment and then someone alreay supporting the environment will know your specifics.

Sorry to be so long - this forum does not always sent an e-amil.


Hope this helps,
d

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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Anuj Dhawan » Sat Feb 15, 2014 11:22 pm

dick scherrer wrote:Sorry to be so long - this forum does not always sent an e-amil.
Hi Dick,

You can set "Notify me upon replies by default" in Edit posting defaults and you will be automatically notified of the first unread reply to your posts in every topic.


Thanks,
Anuj

Disclaimer: My comments on this website are my own and do not represent the opinions or suggestions of any other person or business entity, in any way.

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Re: Difference between MVS/XA and MVS/ESA in mainframes?

Post by Angel » Sat Feb 15, 2014 11:29 pm

Thanks Dick, understood it.



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