IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L13

Today, our clients are running their critical

applications on Linux on z Systems. We have clients doing payments,
payroll, mobile banking, real-time analytics and data warehousing."
-Martin Schwidefsky, Linux on z Systems development, IBM Germany Research & Development

clients can use. We began
working with SUSE first and
then Red Hat. In April 2016,
Canonical's Ubuntu was made
available on z Systems.
The Linux team at IBM
concentrates on core elements,
such as device drivers and
compilers. SUSE, Red Hat and
Ubuntu put together all of
the moving parts and create
something usable by our clients.
The distributors focus on
different parts of the OS and
vary in their offerings. Red
Hat and SUSE have a select
set of packages. The Ubuntu
distribution offers one of the
largest collections of opensource packages.
ISM: How does KVM on z Systems
improve performance and flexibility?
MS: KVM has different
aspects: the kernel module, a
combination of the interface
driver and the kernel module to
provide a VM on Linux, and the
IBM KVM product.
IBM's KVM is an alternative
to our z/VM* Hypervisor, which
won't go away any time soon.
KVM and z/VM Hypervisor can
co-exist on the same system.
KVM allows IBM to expand
our audience for Linux on
z Systems and enables us to
attract new clients who already

have KVM installed or who lack
the necessary z/VM skills. If the
IT shop lacks z/VM skills, it's
easier to use KVM because it uses
standard interfaces.
z/VM Hypervisor still has an
advantage, particularly with the
I/O landscape because you can
have dedicated devices with the
guest. With KVM, only virtual I/O
exists right now.
IBM has optimized KVM to
run on z Systems to get the best
performance from the machine.
We also have a cloud offering
where you can integrate KVM
into the cloud.
ISM: What are some of the new
kernel versions that have been
developed?
MS: The kernel community
doesn't think of kernel releases
as you might have with a product
release. When a new piece of
code is ready, it's published for
review. If everyone is content
with the code, it's placed to be
picked up as part of the next
kernel release.
The distributions created
by our distributor partners
are probably more important.
Whenever we have a new
z Systems machine, we
provide support code for that
machine to our distributors to
be incorporated into the old

distributions. Many clients are
using an older version of the
kernel, so we backport the new
code so they can use it. The
institutional release becomes the
critical factor-not the kernel.

Almost

50%

of z Systems
customers have
Linux installed on
their systems as
of 2Q 2016

ISM: Could you talk about kernel removal and why you would remove it?
MS: Large sections of code in the
kernel have fallen out of use. We
remove these to make the kernel
smaller and easier to handle.
For example, we've removed the
capability to compile a 31-bit kernel because all of the machines
now use a 64-bit kernel. The
64-bit kernel can still run 31-bit
applications.
ISM: What services/workloads will
be driving demand for Linux on
z Systems over the next several
years? Why?
MS: In the end, demand is driven
by whatever the client needs to do
with the platform. Certain trends
in the industry, such as blockchain, are becoming important.
Big data and analytics remain
important. Payroll applications
are critical for some clients.
If clients require changes,
we do so. You have to provide
new solutions that are ready to
be picked up by the client, but
you must also take care of client
needs.

Linux on z Systems NOVEMBER 2016 // 13

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9/29/16 1:14 PM



IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book

Table of Contents
Editor's Desk: Linux on Ibm Z Adoption Grows
Ibm Perspective: Linux on Z Systems Provides Financial Industry a Foundation for Blockchain
Small and Efficient: The New Ibm Z13s Can Consolidate Linux Workloads at a Lower Cost
Cover Story: Open to Opportunity: Why More Z Systems Clients Are Running Linux
Feature: Achieving and Advantage: Linux on Z Systems Enables the Api Economy and Microservices While Enhancing Hybrid Cloud Solutions
Feature: A Better Option: Businesses See the Benefits of Using Linux on Z Systems Over Scale-Out Servers
Trends: Plentiful Middleware Options: Co-Locating Analytics on Linux on Z Systems Adds Value
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L1
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L2
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Editor's Desk: Linux on Ibm Z Adoption Grows
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Ibm Perspective: Linux on Z Systems Provides Financial Industry a Foundation for Blockchain
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L5
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Small and Efficient: The New Ibm Z13s Can Consolidate Linux Workloads at a Lower Cost
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L7
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L8
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L9
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Cover Story: Open to Opportunity: Why More Z Systems Clients Are Running Linux
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L11
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L12
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L13
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Feature: Achieving and Advantage: Linux on Z Systems Enables the Api Economy and Microservices While Enhancing Hybrid Cloud Solutions
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L15
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L16
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L17
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Feature: A Better Option: Businesses See the Benefits of Using Linux on Z Systems Over Scale-Out Servers
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L19
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L20
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L21
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - Trends: Plentiful Middleware Options: Co-Locating Analytics on Linux on Z Systems Adds Value
IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L23
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