IBM Systems Magazine, Mainframe edition - September/October 2013 - 43

ADMINISTRATOR

Great COMMUNICATOR
SMC-R protocol strengthens data sharing performance while reducing CPU costs

T

he IBM zEnterprise* EC12 (and BC12) and z/OS* V2.1 introduce optimized
communications with an innovative solution: Shared Memory CommunicationsRemote Direct Memory Access (RDMA) or SMC-R.

Patty Driever
is an IBM
System z storage
and networking
technologist and
strategist.
Gus Kassimis
is a System z
networking architect
and designer in
z/OS CommServer
and one of the lead
architects of the
SMC-R protocol.
Jerry Stevens
is a System z
networking architect
and designer in
z/OS CommServer
and one of the lead
architects of the
SMC-R protocol.

With SMC-R, System z* network
capability takes a new leap,
strengthening performance
for sharing data and reducing
data transmission network
overhead. Mobile and social
computing, smarter computing
applications and analytics are
driving the proliferation of data
on the mainframe—creating
a need for high-performance
communications.
The System z platform has long
provided HiperSockets* technology
for high-performance LPAR-to-LPAR
communication within the same
Central Processor Complex (CPC).
For CPC-to-CPC communication,
however, SMC-R is a new way of
reducing the network overhead
and latency of data transfers,
effectively offering the benefits of
HiperSockets across processors.
This breakthrough also lowers the
CPU cost associated with moving
large amounts of data.
The new RDMA over Converged
Ethernet (RoCE) feature—10GbE
RoCE Express—enables industrystandard RDMA capability on
the System z platform. As an
RDMA-capable network interface
card (RNIC), it can transfer data
using direct memory-to-memory
communication, reducing the
CPU overhead of the networking
software stack. An overview of

RDMA technology is shown in
Figure 1 (page 44).
Based on an RDMA enabled
network fabric, extensions to the
InfiniBand-standard RoCE allow
existing Ethernet infrastructures
to be leveraged to exploit RDMAbased solutions. The System z RoCE
Express feature provides such
optimized network access.

The Direct or
Indirect Approach
Software exploitation options
for RDMA generally fall into two
categories:
1. Direct RDMA exploitation
using low-level APIs

2. Indirect exploitation using
transparent APIs
Direct exploitation requires
significant investment in applications changes and coordination
in solutions, and imposes new
network administrative requirements. Ideally, what’s needed is
an indirect, transparent solution
that achieves the performance
benefits of RDMA, requires no
application changes and preserves
the key network qualities of service
clients with enterprise data center
networks demand.
SMC-R represents a new
“sockets over RDMA” protocol IBM
created to meet these objectives.

Figure 1: RDMA Technology Overview

Host A
Memory

Host B
Memory

CPU

A

RNIC
Rkey A

CPU

B

RNIC
RDMA enabled
network fabric

Rkey B

ibmsystemsmag.com SEPTEMBER/OCTOBER 2013 // 43


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IBM Systems Magazine, Mainframe edition - September/October 2013

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe edition - September/October 2013

Table of Contents
Editor's Desk: zBC12 doesn't skip a beat
IBM Perspective: Strengthening the experience
Techbits: A microscopic short film
Partner PoV: End-to-end transaction management helps uncover and address CPU challenges
Q&A: 'Father of DB2' Don Haderle looks back-- and to the future
IT Today: Linux support for applications offers a compelling advantage
Case Study: Right Time, Right Place: ARBURG uses mainframe technology and SAP software to create an information-centric environment
Cover Story: Introducing zBC12 and IBM zEnterprise Innovations: New platform extends enterprise-class technologies to clients of all sizes, System z GM Pat Toole says
Feature: Stand Out From the Crowd: Latest zEnterprise extends innovation, performance and security to help businesses differentiate their customer service
Tech Corner: New zEDC Express adapter compresses data faster while using less CPU
Administrator: SMC-R protocol strengthens data sharing performance while reducing CPU costs
Solutions: ZEN TRACE & SOLVE; MegaCryption; Universal SSH Key Manager; TestBase
Stop Run: DB2 pioneer dances his way across the country
Reference Point - Global Events, Education, Resources for Mainframe
2014 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe edition - September/October 2013 - Intro
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover1
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover2
IBM Systems Magazine, Mainframe edition - September/October 2013 - 1
IBM Systems Magazine, Mainframe edition - September/October 2013 - Table of Contents
IBM Systems Magazine, Mainframe edition - September/October 2013 - 3
IBM Systems Magazine, Mainframe edition - September/October 2013 - 4
IBM Systems Magazine, Mainframe edition - September/October 2013 - 5
IBM Systems Magazine, Mainframe edition - September/October 2013 - Editor's Desk: zBC12 doesn't skip a beat
IBM Systems Magazine, Mainframe edition - September/October 2013 - 7
IBM Systems Magazine, Mainframe edition - September/October 2013 - IBM Perspective: Strengthening the experience
IBM Systems Magazine, Mainframe edition - September/October 2013 - 9
IBM Systems Magazine, Mainframe edition - September/October 2013 - Techbits: A microscopic short film
IBM Systems Magazine, Mainframe edition - September/October 2013 - 11
IBM Systems Magazine, Mainframe edition - September/October 2013 - Partner PoV: End-to-end transaction management helps uncover and address CPU challenges
IBM Systems Magazine, Mainframe edition - September/October 2013 - 13
IBM Systems Magazine, Mainframe edition - September/October 2013 - 14
IBM Systems Magazine, Mainframe edition - September/October 2013 - 15
IBM Systems Magazine, Mainframe edition - September/October 2013 - Q&A: 'Father of DB2' Don Haderle looks back-- and to the future
IBM Systems Magazine, Mainframe edition - September/October 2013 - 17
IBM Systems Magazine, Mainframe edition - September/October 2013 - 18
IBM Systems Magazine, Mainframe edition - September/October 2013 - 19
IBM Systems Magazine, Mainframe edition - September/October 2013 - IT Today: Linux support for applications offers a compelling advantage
IBM Systems Magazine, Mainframe edition - September/October 2013 - 21
IBM Systems Magazine, Mainframe edition - September/October 2013 - 22
IBM Systems Magazine, Mainframe edition - September/October 2013 - 23
IBM Systems Magazine, Mainframe edition - September/October 2013 - Case Study: Right Time, Right Place: ARBURG uses mainframe technology and SAP software to create an information-centric environment
IBM Systems Magazine, Mainframe edition - September/October 2013 - 25
IBM Systems Magazine, Mainframe edition - September/October 2013 - 26
IBM Systems Magazine, Mainframe edition - September/October 2013 - 27
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover Story: Introducing zBC12 and IBM zEnterprise Innovations: New platform extends enterprise-class technologies to clients of all sizes, System z GM Pat Toole says
IBM Systems Magazine, Mainframe edition - September/October 2013 - 29
IBM Systems Magazine, Mainframe edition - September/October 2013 - 30
IBM Systems Magazine, Mainframe edition - September/October 2013 - 31
IBM Systems Magazine, Mainframe edition - September/October 2013 - 32
IBM Systems Magazine, Mainframe edition - September/October 2013 - 33
IBM Systems Magazine, Mainframe edition - September/October 2013 - Feature: Stand Out From the Crowd: Latest zEnterprise extends innovation, performance and security to help businesses differentiate their customer service
IBM Systems Magazine, Mainframe edition - September/October 2013 - 35
IBM Systems Magazine, Mainframe edition - September/October 2013 - 36
IBM Systems Magazine, Mainframe edition - September/October 2013 - 37
IBM Systems Magazine, Mainframe edition - September/October 2013 - 38
IBM Systems Magazine, Mainframe edition - September/October 2013 - 39
IBM Systems Magazine, Mainframe edition - September/October 2013 - Tech Corner: New zEDC Express adapter compresses data faster while using less CPU
IBM Systems Magazine, Mainframe edition - September/October 2013 - 41
IBM Systems Magazine, Mainframe edition - September/October 2013 - 42
IBM Systems Magazine, Mainframe edition - September/October 2013 - Administrator: SMC-R protocol strengthens data sharing performance while reducing CPU costs
IBM Systems Magazine, Mainframe edition - September/October 2013 - 44
IBM Systems Magazine, Mainframe edition - September/October 2013 - 45
IBM Systems Magazine, Mainframe edition - September/October 2013 - Solutions: ZEN TRACE & SOLVE; MegaCryption; Universal SSH Key Manager; TestBase
IBM Systems Magazine, Mainframe edition - September/October 2013 - 47
IBM Systems Magazine, Mainframe edition - September/October 2013 - Stop Run: DB2 pioneer dances his way across the country
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover3
IBM Systems Magazine, Mainframe edition - September/October 2013 - Cover4
IBM Systems Magazine, Mainframe edition - September/October 2013 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE0
IBM Systems Magazine, Mainframe edition - September/October 2013 - 2014 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE2
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE3
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE4
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE5
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE6
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE7
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE8
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE9
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE10
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE11
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE12
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE13
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE14
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE15
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE16
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE17
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE18
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE19
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE20
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE21
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE22
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE23
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE24
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE25
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE26
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE27
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE28
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IBM Systems Magazine, Mainframe edition - September/October 2013 - SE30
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE31
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE32
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE33
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE34
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE35
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE36
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE37
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IBM Systems Magazine, Mainframe edition - September/October 2013 - SE39
IBM Systems Magazine, Mainframe edition - September/October 2013 - SE40
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