On 22/5/2023 11:22 pm, Rick Troth wrote:
Rex is right.
Linux (Z or otherwise) is a different operating system. And it's "full
ASCII".
USS, also known as OMVS, has been an integral part of MVS (now known
as z/OS) since the mid 1990s.
IBM has put more and more function into USS, even moving things from
the "traditional" side.
USS is really an excellent piece of work, even though it does speak
EBCDIC. (Which, being Unix in every other way, really confuses
newcomers.)
USS is bi-modal as are the C/C++ compilers. I run everything in USS in
ASCII mode. All of Rocket and IBMs z/OS UNIX ports are in ASCII.
A growing number of people do in fact buy their first mainframe and
run Linux on it. They can go native (LPAR) or on top of z/VM. But
that's not USS (with or without VM).
Z hardware is phenomenal. There's nothing like it. From time to time,
a potential customer will recognize the value of that hardware,
regardless what software workload they anticipate.
Of course, if they want the data moving power of a diesel locomotive,
they should go with z/OS. But for lots of other workloads, they'll
want Linux. No problem!
Not just I/O bandwidth. One of the real differentiators is that Z can
run at 100%. There is an excellent blog by Bob Rogers which explains how
this achieved.
https://blog.share.org/Article/how-does-ibm-z-achieve-efficiency-at-exceedingly-high-utilization-rates
Just ... watch out ... be wary of the folks who mislabel it "Linux for
z/OS". Even with more than 20 years of "Linux for Z", there are still
many people out there who cannot separate z/OS the operating system
from Z hardware.
Does zCX constitute "Linux for z/OS"? z/OS (zCX) is the hypervisor and
it's running s390x Linux containers. I've been working with a RedHat OCP
cluster running on z/OS which is interesting.
-- R; <><
On 5/22/23 10:40, Pommier, Rex wrote:
Hi Bob,
Linux on Z and OMVS are 2 completely different animals. OMVS is an
integral part of z/OS (try running TCP/IP without it for example).
zLinux is a completely separate operating system, running in an LPAR
or on top of VM just like another OS image. Another difference is
that OMVS (as part of z/OS) runs EBCDIC where I believe zLinux is a
full ASCII OS running on the z hardware.
Rex
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on
behalf of Bob Bridges <robhbrid...@gmail.com>
Sent: Monday, May 22, 2023 9:48 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Are Banks Breaking Up With Mainframes? | Forbes
Wait, did I misunderstand this? People buy their first mainframe and
run Linux on it?!
(Color me ignorant, but I've always thought of OMVS as a late add-on.)
---
Bob Bridges, robhbrid...@gmail.com, cell 336 382-7313
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