IBM Systems Magazine, Mainframe - November/December 2016 Linux on z Systems E-book - L20

A better solution is Linux*
running on z Systems. IBM z* provides exceptional performance
and service delivery to efficiently
drive large workloads as well as
consolidate large numbers of
smaller workloads. In addition,
when running Linux on IBM z
co-located with z/OS*, hybrid
workloads that span the SoE/SoR
boundary run with highest efficiency, and often with lower cost.

Figure 1: IBM z Scaling Support
Vertical scaling
Add more
resources to
an existing
Linux guest

Performance and
Service Delivery

IBM z Systems servers are far
more powerful than typical
scale-out models. Mainstream
Intel* cores support clock speeds
of roughly 2.3 to 3.5 GHz, while
IBM z13* cores deliver 5.0
GHz-the fastest commercially
available-and IBM z13s* cores
run at 4.3 GHz. The z13 tops out
at 10 TB of memory, with the z13s
capable of 4 TB. Each IBM z core
has over 4.3x more on-chip cache
per core than an Intel core. IBM z
also has shared L4 cache, which
doesn't exist on Intel chips.
The impact of clock speed,
memory and cache differences
means that data-driven, cacheintensive, compute-intensive
workloads run faster on Linux on
IBM z than on x86 servers.
Database workloads are by
nature very cache-intensive. IBM
engineers ran a pure memory
database access test on an IBM
z13 with six cores running Linux.
The same test produced virtually
the same results on an x86-based
server but required 80 cores.
Because the test ran with so
many fewer cores on the z13, the
database software was calculated
to be 6.7x more expensive on the
x86 server than on Linux on z,
according to IBM.
In another example,
engineers at IBM Research
have recently done medicalrelated data modeling, looking
for breakthroughs in disease

Horizontal scaling

- or clone more Linux guests with a high degree
of resource sharing

prevention and control. Typically,
these studies use huge amounts
of data and involve computeintensive algorithms. When
running these studies on large
clusters of x86 servers, the data
must be partitioned horizontally
across the servers, and the test
itself may take over a week to run
because of repeated sharding and
merging of the data. Alternatively,
the researchers found the tests
could be run in less than an
hour on Linux on z Systems,
primarily because the large cache
and memory on the IBM z13
eliminated the need for sharding,
and the faster clock speeds ran the
computations faster.
Linux on IBM z is also
supported by an exceptional I/O
system, supporting about 80x
more I/O channel processors than
typical x86 servers. This means
I/O intensive workloads also run
faster and more efficiently on
IBM z. Using data from a customer
proof of concept, IBM showed that
the database workload required
432 cores when running on an
x86 cluster, but only 61 IFLs
when running on Linux on IBM z.
The configuration was calculated
to have a 54 percent lower cost of
acquisition.
Unlike scale-out servers, IBM z
is designed with multiple levels
of virtualization, efficiently
supporting large numbers of
business workloads, all in one
box. The IBM z13 platform

can support up to 85 LPARs,
and the z13s up to 40. Each
LPAR is completely isolated
from the others, with the
PR/SM* partition management
functionality "baked" into the
firmware. Common Criteria rates
PR/SM as EAL5+, higher than
any other commercially available
hypervisor. Each LPAR can
optionally run its own software
hypervisor (z/VM* or Kernelbased VM), with each hypervisor
instance supporting upward of 50
VMs running Linux. Additionally,
PR/SM on IBM z is exceptionally
efficient at managing system
resources, ensuring high priority
workloads in one LPAR will
deliver to service levels, even
if lower priority workloads are
running in neighboring LPARs.
IBM has shown that the leading
x86 hypervisor can't match this
service delivery when running
mixed priority workloads in
neighboring VMs.
IBM z is designed for resources
(e.g., CPUs, memory, I/O, etc.) to
be added dynamically without
disruption to the running
environment. This allows for a
Linux platform that can scale
both horizontally (new Linux VMs
can be added as resources are
added) and vertically (resources
are added to an existing VM) (see
Figure 1, above).
These capabilities add up to
some impressive numbers-the
platform is capable of driving

20 // NOVEMBER 2016 Linux on z Systems

Linux_on_z_1116.indd 20

9/29/16 1:15 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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