[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Edlug Archive Mar 2004 ]

Re: [edlug] VM : more details



Hi Denis

Thanks for the very informative posting.  The sharing of information in this
way is IMHO the raison d'etre of EDLUG.

--

Andrew

On Sat, 13 Mar 2004, Denis Leslie wrote:

>
>Nice to hear from other mainframers on this list !
>
>I worked as a VM sysprog, and later as an MVS>>OS/390>>z/OS sysprog>>team
>leader, on several generations of IBM hardware up to and including their
>recent zSeries platform. I started to find out about Linux after hearing what
>IBM had to say about their interest (and investment) in running it on their
>mainframes.
>
>VM started life as CP/67 (Control Program 1967) which provided the "virtual
>machine" environment that allowed the user to run an operating system in each
>virtual machine (vm), unaffected by the activities of other vm's. Later along
>came CMS (Conversational Monitor System) which was a single user OS that
>could run only in a vm and provided facilities for editing, compiling,
>running and debugging programs.
>
>A neat feature was being able to run a new release of VM in a virtual machine
>so you could test it while other users worked on uninterrupted in their own
>vm's. So in one VM system, you could have different vm's running CMS, VM, MVS
>and any other suitable OS's.
>
>This is the capability that is now being exploited to allow customers to run
>many vm's each running Linux. I would expect that, if desired, you could run
>different releases of Linux in the same way as I describe above.
>
>I've heard a number of IBMers explaining that IBM were concerned that new
>generations of computer users coming out of universities didn't know anything
>about IBM's mainframe systems, but they did know about other systems like
>Windows, Unix and Linux. Hence IBM's interest in running Linux on their "big
>iron". They see an opportunity for companies to consolidate large numbers of
>smaller servers on to a single large IBM machine and simplify the management
>of the services they provide.
>
>IBM has a lot of documentation about VM and Linux available online. If you're
>interested in looking at it, a good place to start is :
>
>http://www.vm.ibm.com/linux/
>
-
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