Kirk Wolf writes:
>Very nice idea. UML under z/OS would be cool.

Agreed. I think it could be done and the reward-effort ratio would be
relatively high. Before anybody asks, and speaking only for myself as
always, I would imagine it would be extremely difficult for IBM to do
something like this at least for several non-technical reasons.

Installation and maintenance of the UML image is different than
conventional Linux installation, it should be noted. But if the s390x
branch with UML extensions became sufficiently mature presumably Novell
and/or Red Hat would pick it up and package accordingly. And you could have
multiple zUML revisions running concurrently, each in its own z/OS-hosted
playpen. :-)

Co:Z would be an interesting interaction model to replicate. Not
reinventing the wheel is probably a good idea here.

>A joke once told to me by an old IBMer :
>- "programmers" write code
>- "architects" talk about writing code
>- "methodologists" talk about talking about writing code

Too true!

I have a single Linux kernel patch to my name -- and a pretty darn simple
one -- so for these purposes I'm not much in the first category.

If (when?) anybody attempts this, I think the important part is to keep it
real simple to start and add refinements over time. Stick with a single
eth0 TCP/IP-only network interface, 2 GB of address space or less, and
don't even worry about disk storage initially. (Use a read only /boot image
and a RAM disk; NFS should work over fine eth0 if the network part is
running.) I wouldn't worry about console output either initially: just SSH
into the zUML image over the network. If someone gets that far, the rest is
possible.

- - - - -
Timothy Sipples
IBM Consulting Enterprise Software Architect
Based in Tokyo, Serving IBM Japan / Asia-Pacific
E-Mail: [EMAIL PROTECTED]
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