IBM Systems Magazine, Mainframe - January/February 2017 - 16

FOCUS ON STORAGE

aspect-especially for sequential
writes. However, a flash-based
system must handle the required
sequential workload as well as
random I/O.
The density of flash storage
has increased over the last three
years to the point where significant density savings exist when
compared with high-performance
enterprise drives. Depending on
the cost of data center floor space
and the associated power and
cooling, this can have a major
impact on the overall affordability of flash storage.

Response Time Shrinks
In addition to the speed of the
underlying storage media, several
factors affect a storage system's
host response time. With the
implementation of flash storage,
the media response time can
become a smaller percentage of
the overall response time. Minimizing the other components then
becomes critical to making further
reductions in response time.
Moving to faster SAN fabrics,
channels and host adapters
can help reduce the overall
host response time. Another
often overlooked factor is the
contribution of the protocol
and software stack on the host
to the overall response time.
High Performance FICON* for
z Systems has provided significant
improvements in this area,
and the DS8880 includes other
enhancements to reduce latency
and improve throughput for
specific workloads. These include
IBM zHyperWrite* for DB2* logs,
the DB2 Castout Accelerator and
the List Prefetch Optimizer.

Workload Efficiency
Overall cache hit ratios in z/OS
environments tend to be significantly higher than distributed
systems, however average values can hide variation from one

application to another. In many
cases, specific transactions or
batch jobs receive a higher benefit than others. With flash, the
benefit is avoiding the requirement to spend valuable time and
skilled resources on application
performance tuning and letting
flash's low latency handle those
cache misses.
The latest generation of
z Systems servers supports larger
memory sizes, and middleware
(e.g, DB2, IMS* and CICS*) can
exploit this to provide larger
amounts of caching in server
memory. This reduces the cache hit
ratios on the remaining I/O, meaning historical assumptions about
the cache hit ratios for z/OS will
likely not apply in the future.
A core value proposition
of the mainframe platform is
the capability to run analytics
workloads directly on systems
of record rather than performing
extract, transform and load
processing and then performing
analytics on a copy of the data.
This can drive additional I/O
workload on the same data
volume; without flash storage,
this can cause performance issues.
Clients who have implemented
flash storage for z/OS can enable
analytics such as fraud detection
on the same systems and in
real time while still meeting
performance goals.

R
The IBM
DS8000 family
includes both
the all-flash
DS8888, and
hybrid DS8884
and DS8886
systems

Compression
and Deduplication
In distributed environments, many
storage systems offer compression
and/or deduplication capabilities
to reduce the relative price of
flash storage. IBM offerings for

More Information
Learn more about the IBM DS8000 family:
ibm.com/systems/storage/disk/ds8000

16 // JANUARY/FEBRUARY 2017 ibmsystemsmag.com

this include the A9000 and the
Storwize* platform.
On z Systems, the zEDC and
compression coprocessor provide
application-aware compression
capabilities that can be used no
matter the type of storage media.
Therefore, significantly reduced
benefit exists in implementing
compression in the storage system,
as compression higher in the stack
benefits the server and SAN as
well as back-end storage capacity.
In the case of the zEDC, this can
provide superior compression
ratios as well.

Continued
Cost Reduction
Flash storage media costs continue to decrease 25 to 30 percent
per year-faster than traditional
HDD. Many workloads are also
past the point where larger HDD
is viable; in these cases, the cost
of HDD storage may not actually
decrease over time.
When comparing the costs
of different media types in an
enterprise storage system, examine more than just the cost per
gigabyte of the media, as this can
provide an unrealistic view of the
differences. Larger drives spread
the cost of I/O enclosures, device
adapters and the rack infrastructure over a larger number of terabytes of data, which can significantly affect the relative costs.
For example, a 3.2 TB flash
card (rated at 10 drive writes
per day) is around 3.1x the cost
per terabyte of a 300 GB 15K
enterprise drive when considering
only the cost of the media. When
the other required infrastructure
is included, it's only 1.5x higher
in terms of acquisition cost.
This calculation doesn't include
costs of disk controllers, host
adapters and advanced function
licenses or floor space/power/cooling and maintenance costs, so the
differences are lower when looking


http://www.ibm.com/systems/storage/disk/ds8000 http://www.ibmsystemsmag.com

IBM Systems Magazine, Mainframe - January/February 2017

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - January/February 2017

Table of Contents
Editor's Desk: Loads of Options
Techbits:
Infographic: Your Route to Digital Innovation
Partner PoV: Ignite Innovation: Optimize Linux on z Systems with adaptation, analytics and collaboration
Currents: Great Gains: Hybrid cloud adopters gain competitve advantages
Focus on Storage: Storage in a Flash: Improve performance and efficiency with hybrid and all-flash storage
Cover Story: Mainframe Options: IBM z Systems supports modern languages, tools, optimization and processes
Feature: Unleash Business Applications: IBM Application Discovery unlocks new value and accelerates the adoption of hybrid cloud solutions
Tech Trends: What Keeps IT Leaders Up at Night? Cloud computing is cited as top priority
Tech Corner: Healthy Status: z/OS Health Checker features productivity and ease-of-use enhancements
Solutions: BoxScore II, H&W Computer Systems; CleverView for TCP/IP V9.1, AES; ISPW Deploy, Compuware
Stop Run: Data Points to Love: IBMer combines marketing, technology expertise to help others navigate online dating
Reference Point - Global Events, Education, Resources for Mainframe
2017 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - January/February 2017 - Intro
IBM Systems Magazine, Mainframe - January/February 2017 - Cover1
IBM Systems Magazine, Mainframe - January/February 2017 - Cover2
IBM Systems Magazine, Mainframe - January/February 2017 - 1
IBM Systems Magazine, Mainframe - January/February 2017 - Table of Contents
IBM Systems Magazine, Mainframe - January/February 2017 - 3
IBM Systems Magazine, Mainframe - January/February 2017 - 4
IBM Systems Magazine, Mainframe - January/February 2017 - 5
IBM Systems Magazine, Mainframe - January/February 2017 - Editor's Desk: Loads of Options
IBM Systems Magazine, Mainframe - January/February 2017 - 7
IBM Systems Magazine, Mainframe - January/February 2017 - Techbits:
IBM Systems Magazine, Mainframe - January/February 2017 - Infographic: Your Route to Digital Innovation
IBM Systems Magazine, Mainframe - January/February 2017 - Partner PoV: Ignite Innovation: Optimize Linux on z Systems with adaptation, analytics and collaboration
IBM Systems Magazine, Mainframe - January/February 2017 - 11
IBM Systems Magazine, Mainframe - January/February 2017 - Currents: Great Gains: Hybrid cloud adopters gain competitve advantages
IBM Systems Magazine, Mainframe - January/February 2017 - 13
IBM Systems Magazine, Mainframe - January/February 2017 - 14
IBM Systems Magazine, Mainframe - January/February 2017 - Focus on Storage: Storage in a Flash: Improve performance and efficiency with hybrid and all-flash storage
IBM Systems Magazine, Mainframe - January/February 2017 - 16
IBM Systems Magazine, Mainframe - January/February 2017 - 17
IBM Systems Magazine, Mainframe - January/February 2017 - Cover Story: Mainframe Options: IBM z Systems supports modern languages, tools, optimization and processes
IBM Systems Magazine, Mainframe - January/February 2017 - 19
IBM Systems Magazine, Mainframe - January/February 2017 - 20
IBM Systems Magazine, Mainframe - January/February 2017 - 21
IBM Systems Magazine, Mainframe - January/February 2017 - 22
IBM Systems Magazine, Mainframe - January/February 2017 - Feature: Unleash Business Applications: IBM Application Discovery unlocks new value and accelerates the adoption of hybrid cloud solutions
IBM Systems Magazine, Mainframe - January/February 2017 - 24
IBM Systems Magazine, Mainframe - January/February 2017 - 25
IBM Systems Magazine, Mainframe - January/February 2017 - 26
IBM Systems Magazine, Mainframe - January/February 2017 - 27
IBM Systems Magazine, Mainframe - January/February 2017 - Tech Trends: What Keeps IT Leaders Up at Night? Cloud computing is cited as top priority
IBM Systems Magazine, Mainframe - January/February 2017 - 29
IBM Systems Magazine, Mainframe - January/February 2017 - 30
IBM Systems Magazine, Mainframe - January/February 2017 - 31
IBM Systems Magazine, Mainframe - January/February 2017 - Tech Corner: Healthy Status: z/OS Health Checker features productivity and ease-of-use enhancements
IBM Systems Magazine, Mainframe - January/February 2017 - 33
IBM Systems Magazine, Mainframe - January/February 2017 - 34
IBM Systems Magazine, Mainframe - January/February 2017 - 35
IBM Systems Magazine, Mainframe - January/February 2017 - 36
IBM Systems Magazine, Mainframe - January/February 2017 - 37
IBM Systems Magazine, Mainframe - January/February 2017 - Solutions: BoxScore II, H&W Computer Systems; CleverView for TCP/IP V9.1, AES; ISPW Deploy, Compuware
IBM Systems Magazine, Mainframe - January/February 2017 - 39
IBM Systems Magazine, Mainframe - January/February 2017 - Stop Run: Data Points to Love: IBMer combines marketing, technology expertise to help others navigate online dating
IBM Systems Magazine, Mainframe - January/February 2017 - Cover3
IBM Systems Magazine, Mainframe - January/February 2017 - Cover4
IBM Systems Magazine, Mainframe - January/February 2017 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - January/February 2017 - SE
IBM Systems Magazine, Mainframe - January/February 2017 - 2017 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - January/February 2017 - SE2
IBM Systems Magazine, Mainframe - January/February 2017 - SE3
IBM Systems Magazine, Mainframe - January/February 2017 - SE4
IBM Systems Magazine, Mainframe - January/February 2017 - SE5
IBM Systems Magazine, Mainframe - January/February 2017 - SE6
IBM Systems Magazine, Mainframe - January/February 2017 - SE7
IBM Systems Magazine, Mainframe - January/February 2017 - SE8
IBM Systems Magazine, Mainframe - January/February 2017 - SE9
IBM Systems Magazine, Mainframe - January/February 2017 - SE10
IBM Systems Magazine, Mainframe - January/February 2017 - SE11
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IBM Systems Magazine, Mainframe - January/February 2017 - SE13
IBM Systems Magazine, Mainframe - January/February 2017 - SE14
IBM Systems Magazine, Mainframe - January/February 2017 - SE15
IBM Systems Magazine, Mainframe - January/February 2017 - SE16
IBM Systems Magazine, Mainframe - January/February 2017 - SE17
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IBM Systems Magazine, Mainframe - January/February 2017 - SE21
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IBM Systems Magazine, Mainframe - January/February 2017 - SE31
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IBM Systems Magazine, Mainframe - January/February 2017 - SE43
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IBM Systems Magazine, Mainframe - January/February 2017 - SE46
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IBM Systems Magazine, Mainframe - January/February 2017 - SE50
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