IBM Systems Magazine, Mainframe edition - September/October 2013 - (Page 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 http://www.ibmsystemsmag.com

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

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