IBM Systems Magazine, Mainframe - September/October 2015 - 42

ADMINISTRATOR

EDITOR'S NOTE: This is part two of
a two-part series on the IBM DS8870
storage subsystem on the IBM z13
platform. Read part one in the
July/August 2015 issue.

Get Into the EXPRESS LANE
With FICON
New zHPF protocols offer up to a 68 percent reduction in I/O service time
for write operations

T

he IBM z13* system and IBM DS8870 storage subsystem have been designed
to deliver on a set of enhancements to meet the ever-increasing demands of
transaction processing and cloud, analytics, mobile, social and security.

Christopher
Colonna
is the FICON
channel firmware
execution team lead
for z Systems, IBM
Systems.
Roger G. Hathorn
is a Senior Technical
Staff Member for
enterprise storage
I/O architecture and
development, IBM
Systems.
Harry M.
Yudenfriend
is an IBM Fellow
for storage
development and
mainframe I/O
technology, IBM
Systems.

Clients have expressed the
desire to share inter-switch links
(ISLs) between their FICON* I/O
traffic and the Fibre Channel Protocol (FCP) Metro Mirror traffic
generated from it. This would
allow them to not only share the
same physical ports and fibers
between switches and sites, but
also get predictable and repeatable performance with a dynamic
routing policy that was lacking
with the older static-based routing policies.
Both of these attributes would
save client money by allowing
the reduction in port counts,
fibers and the leasing of dark
fiber bandwidth between sites.
Additionally, the people cost
for managing the storage-area
network (SAN) fiber performance
could also be reduced.
With the z13 system, FICON
is no longer restricted to the use
of static SAN routing policies
for cascading FICON directors.
This z13 feature that supports
dynamic routing in the SAN is
called FICON Dynamic Routing
(FIDR). It provides the support

42 // SEPTEMBER/OCTOBER 2015 ibmsystemsmag.com

needed to handle the out-of-order
conditions that could occur when
using dynamic routing policies
in the SAN, thus eliminating any
possible protocol errors that used
to occur if SAN dynamic routing
was enabled. Only qualified
FICON directors are supported
for use with FIDR. Clients are
encouraged to check with their
SAN provider to make sure the
equipment and firmware versions
have been qualified.
The DS8870 storage subsystem
has been qualified to work with
the FIDR feature and participate
in z/OS* health checks to validate
that the configuration is supported
by all of the attached equipment.
The capability for z Systems*
clients to share their fibre channel
SANs between FICON traffic and
their FCP Metro Mirror traffic
can reduce costs. The inability to
share ISLs with different routing
policies increases costs because it
requires additional expense for:
ĀÃ

3K\VLFDOÃKDUGZDUHÃLQFOXGLQJÃ
switches, switch ports and
ISL links

ĀÃ

ĀÃ

,6/ÃOLQNVÃZKLFKÃUHTXLUHÃFOLHQWVÃ
to lease additional dark fibre
and bandwidth between sites
3HUVRQQHOÃDQGÃVNLOOVÃWRÃPDQage the complexity, problem
determination, identification
of hot spots, instrumentation
and accounting

Even in a FICON-only
environment, FIDR and SAN
dynamic routing policies enable
a better balance of the workload
over links with predictable
and repeatable performance,
which will also reduce costs by
simplifying management.
SAN dynamic routing policies
can better exploit all of the available ISL bandwidth than static
routing policies. As a result, ISLs
can be driven to higher utilization
before incurring queuing delays
that would result in longer I/O
service times.
Static routing policies can
assign different ISL routes from
power-on-reset (POR) to POR of
the SAN fabric. The routes are
assigned without any previous
knowledge of the traffic that may


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IBM Systems Magazine, Mainframe - September/October 2015

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - September/October 2015

Table of Contents
Editor's Desk: Flexible options
IBM Perspective: The full potential of Linux
Infographic: Differentiate your cloud services and drive margins sky-high
Techbits: The P-TECH fast track
Partner PoV: Virtualizing system software can help reduce data center costs
Trends: IBM has the roadmap you need to get to business innovation
Currents: Thanks to mobile apps, users can access IBM z Systems services and data
IT Today: A Cloud IT Optimization Assessment can help determine the right solutions
Case Study: Letters Home: Western Illinois University improves school-to-student interaction with more eye-catching financial aid documents
Cover Story: Linux Breakthrough: New IBM LinuxONE systems are enterprise-grade and built for business-critical applications
Feature: Community Partnership: The new Open Mainframe Project capitalizes on the strengths of z Systems and Linux to foster growth
Feature: A Matter of Standards: The KVM hypervisor extends familiar tools to Linux on the mainframe
Tech Showcase: Understanding VSAM can help you process and access information
Administrator: New zHPF protocols offer up to a 68 percent reduction in I/O service time for write operations
Solutions: Integration Link; SIEM Agent for z/OS
Stop Run: Software engineer notes creative side with musical instruments and choirs
Reference Point - Global Events, Education, Resources for Mainframe
Mainframe Skills Special Report
2016 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - September/October 2015 - Intro
IBM Systems Magazine, Mainframe - September/October 2015 - Cover1
IBM Systems Magazine, Mainframe - September/October 2015 - Cover2
IBM Systems Magazine, Mainframe - September/October 2015 - 1
IBM Systems Magazine, Mainframe - September/October 2015 - 2
IBM Systems Magazine, Mainframe - September/October 2015 - Table of Contents
IBM Systems Magazine, Mainframe - September/October 2015 - Editor's Desk: Flexible options
IBM Systems Magazine, Mainframe - September/October 2015 - 5
IBM Systems Magazine, Mainframe - September/October 2015 - IBM Perspective: The full potential of Linux
IBM Systems Magazine, Mainframe - September/October 2015 - Infographic: Differentiate your cloud services and drive margins sky-high
IBM Systems Magazine, Mainframe - September/October 2015 - Techbits: The P-TECH fast track
IBM Systems Magazine, Mainframe - September/October 2015 - 9
IBM Systems Magazine, Mainframe - September/October 2015 - Partner PoV: Virtualizing system software can help reduce data center costs
IBM Systems Magazine, Mainframe - September/October 2015 - 11
IBM Systems Magazine, Mainframe - September/October 2015 - Trends: IBM has the roadmap you need to get to business innovation
IBM Systems Magazine, Mainframe - September/October 2015 - 13
IBM Systems Magazine, Mainframe - September/October 2015 - 14
IBM Systems Magazine, Mainframe - September/October 2015 - 15
IBM Systems Magazine, Mainframe - September/October 2015 - Currents: Thanks to mobile apps, users can access IBM z Systems services and data
IBM Systems Magazine, Mainframe - September/October 2015 - 17
IBM Systems Magazine, Mainframe - September/October 2015 - 18
IBM Systems Magazine, Mainframe - September/October 2015 - 19
IBM Systems Magazine, Mainframe - September/October 2015 - IT Today: A Cloud IT Optimization Assessment can help determine the right solutions
IBM Systems Magazine, Mainframe - September/October 2015 - 21
IBM Systems Magazine, Mainframe - September/October 2015 - 22
IBM Systems Magazine, Mainframe - September/October 2015 - 23
IBM Systems Magazine, Mainframe - September/October 2015 - Case Study: Letters Home: Western Illinois University improves school-to-student interaction with more eye-catching financial aid documents
IBM Systems Magazine, Mainframe - September/October 2015 - 25
IBM Systems Magazine, Mainframe - September/October 2015 - 26
IBM Systems Magazine, Mainframe - September/October 2015 - 27
IBM Systems Magazine, Mainframe - September/October 2015 - Cover Story: Linux Breakthrough: New IBM LinuxONE systems are enterprise-grade and built for business-critical applications
IBM Systems Magazine, Mainframe - September/October 2015 - 29
IBM Systems Magazine, Mainframe - September/October 2015 - 30
IBM Systems Magazine, Mainframe - September/October 2015 - 31
IBM Systems Magazine, Mainframe - September/October 2015 - Feature: Community Partnership: The new Open Mainframe Project capitalizes on the strengths of z Systems and Linux to foster growth
IBM Systems Magazine, Mainframe - September/October 2015 - 33
IBM Systems Magazine, Mainframe - September/October 2015 - 34
IBM Systems Magazine, Mainframe - September/October 2015 - 35
IBM Systems Magazine, Mainframe - September/October 2015 - Feature: A Matter of Standards: The KVM hypervisor extends familiar tools to Linux on the mainframe
IBM Systems Magazine, Mainframe - September/October 2015 - 37
IBM Systems Magazine, Mainframe - September/October 2015 - 38
IBM Systems Magazine, Mainframe - September/October 2015 - Tech Showcase: Understanding VSAM can help you process and access information
IBM Systems Magazine, Mainframe - September/October 2015 - 40
IBM Systems Magazine, Mainframe - September/October 2015 - 41
IBM Systems Magazine, Mainframe - September/October 2015 - Administrator: New zHPF protocols offer up to a 68 percent reduction in I/O service time for write operations
IBM Systems Magazine, Mainframe - September/October 2015 - 43
IBM Systems Magazine, Mainframe - September/October 2015 - 44
IBM Systems Magazine, Mainframe - September/October 2015 - 45
IBM Systems Magazine, Mainframe - September/October 2015 - 46
IBM Systems Magazine, Mainframe - September/October 2015 - Solutions: Integration Link; SIEM Agent for z/OS
IBM Systems Magazine, Mainframe - September/October 2015 - Stop Run: Software engineer notes creative side with musical instruments and choirs
IBM Systems Magazine, Mainframe - September/October 2015 - Cover3
IBM Systems Magazine, Mainframe - September/October 2015 - Cover4
IBM Systems Magazine, Mainframe - September/October 2015 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - September/October 2015 - MS0
IBM Systems Magazine, Mainframe - September/October 2015 - Mainframe Skills Special Report
IBM Systems Magazine, Mainframe - September/October 2015 - MS2
IBM Systems Magazine, Mainframe - September/October 2015 - MS3
IBM Systems Magazine, Mainframe - September/October 2015 - MS4
IBM Systems Magazine, Mainframe - September/October 2015 - MS5
IBM Systems Magazine, Mainframe - September/October 2015 - MS6
IBM Systems Magazine, Mainframe - September/October 2015 - MS7
IBM Systems Magazine, Mainframe - September/October 2015 - MS8
IBM Systems Magazine, Mainframe - September/October 2015 - MS9
IBM Systems Magazine, Mainframe - September/October 2015 - MS10
IBM Systems Magazine, Mainframe - September/October 2015 - MS11
IBM Systems Magazine, Mainframe - September/October 2015 - MS12
IBM Systems Magazine, Mainframe - September/October 2015 - MS13
IBM Systems Magazine, Mainframe - September/October 2015 - SE0
IBM Systems Magazine, Mainframe - September/October 2015 - 2016 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - September/October 2015 - SE2
IBM Systems Magazine, Mainframe - September/October 2015 - SE3
IBM Systems Magazine, Mainframe - September/October 2015 - SE4
IBM Systems Magazine, Mainframe - September/October 2015 - SE5
IBM Systems Magazine, Mainframe - September/October 2015 - SE6
IBM Systems Magazine, Mainframe - September/October 2015 - SE7
IBM Systems Magazine, Mainframe - September/October 2015 - SE8
IBM Systems Magazine, Mainframe - September/October 2015 - SE9
IBM Systems Magazine, Mainframe - September/October 2015 - SE10
IBM Systems Magazine, Mainframe - September/October 2015 - SE11
IBM Systems Magazine, Mainframe - September/October 2015 - SE12
IBM Systems Magazine, Mainframe - September/October 2015 - SE13
IBM Systems Magazine, Mainframe - September/October 2015 - SE14
IBM Systems Magazine, Mainframe - September/October 2015 - SE15
IBM Systems Magazine, Mainframe - September/October 2015 - SE16
IBM Systems Magazine, Mainframe - September/October 2015 - SE17
IBM Systems Magazine, Mainframe - September/October 2015 - SE18
IBM Systems Magazine, Mainframe - September/October 2015 - SE19
IBM Systems Magazine, Mainframe - September/October 2015 - SE20
IBM Systems Magazine, Mainframe - September/October 2015 - SE21
IBM Systems Magazine, Mainframe - September/October 2015 - SE22
IBM Systems Magazine, Mainframe - September/October 2015 - SE23
IBM Systems Magazine, Mainframe - September/October 2015 - SE24
IBM Systems Magazine, Mainframe - September/October 2015 - SE25
IBM Systems Magazine, Mainframe - September/October 2015 - SE26
IBM Systems Magazine, Mainframe - September/October 2015 - SE27
IBM Systems Magazine, Mainframe - September/October 2015 - SE28
IBM Systems Magazine, Mainframe - September/October 2015 - SE29
IBM Systems Magazine, Mainframe - September/October 2015 - SE30
IBM Systems Magazine, Mainframe - September/October 2015 - SE31
IBM Systems Magazine, Mainframe - September/October 2015 - SE32
IBM Systems Magazine, Mainframe - September/October 2015 - SE33
IBM Systems Magazine, Mainframe - September/October 2015 - SE34
IBM Systems Magazine, Mainframe - September/October 2015 - SE35
IBM Systems Magazine, Mainframe - September/October 2015 - SE36
IBM Systems Magazine, Mainframe - September/October 2015 - SE37
IBM Systems Magazine, Mainframe - September/October 2015 - SE38
IBM Systems Magazine, Mainframe - September/October 2015 - SE39
IBM Systems Magazine, Mainframe - September/October 2015 - SE40
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