IBM Systems Magazine, Mainframe - July/August 2012 - 40

time could allow users to move from quarterly to monthly—or even daily—close cycles. Reduced CPU consumption could enable deeper analysis to detect new sales opportunities. Physical memory on the server helps determine both the response time of transactions, and the elapsed time and CPU cost of batch workloads. Today, System z* servers support up to 3 TB of real memory per server shared across all of its partitions. Each partition can use up to 1 TB of memory. Large z/OS partitions typically are configured with 100 to 300 GB of real memory—some even larger. Many z/OS stack users have completed the migration to 64-bit systems and are deploying the software stack needed to gain value from very large real memory. Technology supports an increased role for large real memory. Dynamic RAM (DRAM), the current building block for memory, has industry roadmaps showing substantial scaling past 20 TB per server despite current DRAM scaling issues. Real memory per image in a System z server can approach the size of some databases, enabling in-memory database optimization.

DATA ACCESS FROM THE COUPLING FACILITY CAN BE 10 TO 50 TIMES FASTER THAN GETTING THE EQUIVALENT DATA FROM DISK.
—IBM Information on Demand whitepaper, “Save CPU Using Memory”

Memory Shift
Big insights, big data and the demand for real-time analytics in combination with

low-latency transactions place high demands on data access, and it’s becoming increasingly challenging for modern I/O subsystems to deliver. The need to improve latency has fallen on application and middleware developers as well as system providers. The industry, therefore, is seeing a shift in application and middleware programming models, persistency systems, and application-development frameworks. At the same time, we see the evolution of in-memory databases and analytics, large-scale distributed caching systems such as WebSphere* Extreme Scale, and object-relational mapping libraries for persistency such as Java* Persistence API. As a result of this shift, modern Java Runtime Environments, such as IBM J9 Virtual Machine, include incremental garbage collection (GC) technology (like the balanced GC policy) to address increasing heap storage to thread

performance ratios. Java users are reacting to these changes by configuring servers, including System z servers, with much larger amounts of real memory. Large memory is necessary to support the evolving Java environment for paging avoidance, for example, and to enable CPU-saving technology such as 1 MB large pages.

hÁReduce CPU resource consumption
The November 2011 IBM Information on Demand whitepaper, “Save CPU Using Memory,” showed that the IBM Relational Warehouse Workload (IRWW) had a 40 percent response-time reduction and a 5 percent CPU performance improvement by exploiting increased buffer-pool sizes. DB2 can also exploit larger real memory in the coupling facility (CF). Data access from the CF can be 10 to 50 times faster than getting the equivalent data from disk. Support in z/OS improves DB2 CF data caching by cooperatively managing data placement during utility processing. DB2 10 for z/OS, supported by larger real memory, has tremendous potential to improve performance and scalability. Additional real memory is required to gain the full potential of DB2 10 for improved performance

The Benefits of Larger Buffer Pools
Users of DB2* for z/OS are reassessing the relationship between CPU, storage and synchronous I/O resource consumption for their critical workloads. Noting software license fees and physical memory costs, users are shifting their investment toward additional real storage to support larger buffer pools. Supporting these buffer pools with larger real storage can:

hÁImprove the user response times hÁIncrease transaction throughput

Research shows a 5 to 10 percent improvement in CPU performance in DB2 10 versus DB2 9 through better memory management for remote/local applications.

40

J U LY/AU G U S T 2 0 12

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IBM Systems Magazine, Mainframe - July/August 2012

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - July/August 2012

Editor's Desk: The Taste of Success
Dashboard: Pay by Phone - Current Conditions - Work Without Boundaries - Digital Personalities
IBM Perspective: The Performance of Many, the Efficiency of One
Trends: Why zBX Outperforms DIY When Deploying a Hybrid Infrastructure
Q&A: Accurate TCO Analysis Demonstrates the True Value of System z
IT Today: IBM's Integrated Solution for System z Streamlines Software Delivery
Case Study: Taking Shelter From the Storm: Shelter Insurance employs a measured approach in adopting Linux on zEnterprise 114
Cover Story: Internal Transformation: System z is at the center of initiative, which has saved the company $100 million so far
Feature: Large Memory Tames Big Data: The System z stack evolves to deliver business value from more memory
Tech Corner: A More Effective Comparison Starts With Relative Capacity
Administrator: JES2 Helps Expedite the Relocation of Data Volumes
Solutions: Double-Take Share 5.0 - Vanguard Security and Compliance Solutions - MegaCryption DB - ASG-TMON for DB2 - Reflection Suite for X - Orchestrated IT
Advertiser's Index
Stop Run: Wreck Diving Brings IBMer Face to Face With Lost History
Reference Point - Global Events, Education, Resources for Mainframe
IB Tape Storage
IBM Systems Magazine, Mainframe - July/August 2012 - Intro
IBM Systems Magazine, Mainframe - July/August 2012 - Cover1
IBM Systems Magazine, Mainframe - July/August 2012 - Cover2
IBM Systems Magazine, Mainframe - July/August 2012 - 1
IBM Systems Magazine, Mainframe - July/August 2012 - 2
IBM Systems Magazine, Mainframe - July/August 2012 - 3
IBM Systems Magazine, Mainframe - July/August 2012 - 4
IBM Systems Magazine, Mainframe - July/August 2012 - 5
IBM Systems Magazine, Mainframe - July/August 2012 - Editor's Desk: The Taste of Success
IBM Systems Magazine, Mainframe - July/August 2012 - 7
IBM Systems Magazine, Mainframe - July/August 2012 - Dashboard: Pay by Phone - Current Conditions - Work Without Boundaries - Digital Personalities
IBM Systems Magazine, Mainframe - July/August 2012 - IBM Perspective: The Performance of Many, the Efficiency of One
IBM Systems Magazine, Mainframe - July/August 2012 - Trends: Why zBX Outperforms DIY When Deploying a Hybrid Infrastructure
IBM Systems Magazine, Mainframe - July/August 2012 - 11
IBM Systems Magazine, Mainframe - July/August 2012 - 12
IBM Systems Magazine, Mainframe - July/August 2012 - 13
IBM Systems Magazine, Mainframe - July/August 2012 - 14
IBM Systems Magazine, Mainframe - July/August 2012 - 15
IBM Systems Magazine, Mainframe - July/August 2012 - Q&A: Accurate TCO Analysis Demonstrates the True Value of System z
IBM Systems Magazine, Mainframe - July/August 2012 - 17
IBM Systems Magazine, Mainframe - July/August 2012 - 18
IBM Systems Magazine, Mainframe - July/August 2012 - 19
IBM Systems Magazine, Mainframe - July/August 2012 - 20
IBM Systems Magazine, Mainframe - July/August 2012 - 21
IBM Systems Magazine, Mainframe - July/August 2012 - IT Today: IBM's Integrated Solution for System z Streamlines Software Delivery
IBM Systems Magazine, Mainframe - July/August 2012 - 23
IBM Systems Magazine, Mainframe - July/August 2012 - 24
IBM Systems Magazine, Mainframe - July/August 2012 - 25
IBM Systems Magazine, Mainframe - July/August 2012 - Case Study: Taking Shelter From the Storm: Shelter Insurance employs a measured approach in adopting Linux on zEnterprise 114
IBM Systems Magazine, Mainframe - July/August 2012 - 27
IBM Systems Magazine, Mainframe - July/August 2012 - 28
IBM Systems Magazine, Mainframe - July/August 2012 - 29
IBM Systems Magazine, Mainframe - July/August 2012 - 30
IBM Systems Magazine, Mainframe - July/August 2012 - 31
IBM Systems Magazine, Mainframe - July/August 2012 - Cover Story: Internal Transformation: System z is at the center of initiative, which has saved the company $100 million so far
IBM Systems Magazine, Mainframe - July/August 2012 - 33
IBM Systems Magazine, Mainframe - July/August 2012 - 34
IBM Systems Magazine, Mainframe - July/August 2012 - 35
IBM Systems Magazine, Mainframe - July/August 2012 - 36
IBM Systems Magazine, Mainframe - July/August 2012 - 37
IBM Systems Magazine, Mainframe - July/August 2012 - Feature: Large Memory Tames Big Data: The System z stack evolves to deliver business value from more memory
IBM Systems Magazine, Mainframe - July/August 2012 - 39
IBM Systems Magazine, Mainframe - July/August 2012 - 40
IBM Systems Magazine, Mainframe - July/August 2012 - 41
IBM Systems Magazine, Mainframe - July/August 2012 - 42
IBM Systems Magazine, Mainframe - July/August 2012 - Tech Corner: A More Effective Comparison Starts With Relative Capacity
IBM Systems Magazine, Mainframe - July/August 2012 - 44
IBM Systems Magazine, Mainframe - July/August 2012 - 45
IBM Systems Magazine, Mainframe - July/August 2012 - 46
IBM Systems Magazine, Mainframe - July/August 2012 - 47
IBM Systems Magazine, Mainframe - July/August 2012 - Administrator: JES2 Helps Expedite the Relocation of Data Volumes
IBM Systems Magazine, Mainframe - July/August 2012 - 49
IBM Systems Magazine, Mainframe - July/August 2012 - 50
IBM Systems Magazine, Mainframe - July/August 2012 - 51
IBM Systems Magazine, Mainframe - July/August 2012 - Solutions: Double-Take Share 5.0 - Vanguard Security and Compliance Solutions - MegaCryption DB - ASG-TMON for DB2 - Reflection Suite for X - Orchestrated IT
IBM Systems Magazine, Mainframe - July/August 2012 - 53
IBM Systems Magazine, Mainframe - July/August 2012 - Advertiser's Index
IBM Systems Magazine, Mainframe - July/August 2012 - Stop Run: Wreck Diving Brings IBMer Face to Face With Lost History
IBM Systems Magazine, Mainframe - July/August 2012 - 56
IBM Systems Magazine, Mainframe - July/August 2012 - Cover3
IBM Systems Magazine, Mainframe - July/August 2012 - Cover4
IBM Systems Magazine, Mainframe - July/August 2012 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - July/August 2012 - BG1
IBM Systems Magazine, Mainframe - July/August 2012 - BG2
IBM Systems Magazine, Mainframe - July/August 2012 - IB Tape Storage
IBM Systems Magazine, Mainframe - July/August 2012 - T2
IBM Systems Magazine, Mainframe - July/August 2012 - T3
IBM Systems Magazine, Mainframe - July/August 2012 - T4
IBM Systems Magazine, Mainframe - July/August 2012 - T5
IBM Systems Magazine, Mainframe - July/August 2012 - T6
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