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Frankjiang · Posted: Sat Jan 10, 2004 3:21 pm Post subject: About JCL ?

Hello :

Does someone can suggest me a book for JCL ? What is relation between OS/390 and VSE,MVS ?

Thank you very much

Frank
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franklin

Mike · Posted: Sun Jan 11, 2004 6:12 pm Post subject:

A little history. with IBM mainframes you have a choice of operating systems. Those starting with V being virtual operating systems allowing other operating systems to be run as if they were on different machines. E.g. you could have an MVS image running under VM.

I don't know that much about VM and it's subsequent incarnations such as VSE (you can liken this to windows 3.1 progressing to 95, then to 98 then to ME).

I'm a little more knowledgable with MVS (Multiprogramming Virtual Storage) which is used generically, similar to windows being used generically on PC's.

The progression from MVS goes :-

MVS SP (Standard product [ might have this wrong])
MVS XA (Extended Architecture where 31 bit addressing was added)
MVS ESA (Enterprise System Architecture - Still 31 bit addressing)
OS/390 (Operating System for System 390 architecture)

You could liken the difference to VM and MVS to the differences between Normal windows and the windows NT line, or perhaps between Windows and Linux.

So VSE is, if I understand correctly a virtual operating system, whilst both OS/390 and MVS are not. Whilst the difference between OS/390 and MVS may be nothing or it may be changes that have evolved from MVS SP through to OS/390.

My apologies if all I've done is to further confuse you.
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Regards,
Mike.

warp5 · Posted: Mon Jan 12, 2004 2:03 am Post subject:

Mike, your MVS description was OK, but VM and VSE are two different systems. VSE was and still is installed on many smaller systems, but has evolved to be a very powerful operating system. VM (Virtual Machine) is also used by many shops instead of LPARs, you can have many different guest machines running under it (VSE, MVS, etc.). Many shops run their Linux directly under VM.

kolusu · Posted: Mon Jan 12, 2004 5:18 am Post subject:

Frankjiang,

VSE stands for Virtual Storage Extended. It basically designed to be IBM
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Kolusu
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Mike · Posted: Mon Jan 12, 2004 2:32 pm Post subject:

Thanks Warp5 and Kolusu for putting me straight re VSE. I've never knowingly worked with VSE and have only had a few limited exposures to VM.
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Regards,
Mike.