IBM Systems Magazine, Mainframe - July/August 2012 - 42

and cost reduction. Most organizations can measurably improve performance by:

IMS Implications
IMS* users are taking advantage of larger real memory by page-fixing blocks and buffers. Just as with DB2, increasing fixed blocks and database buffers can cut down on I/O delays by keeping the data IMS needs in memory. When you couple the IMS 12 capability to dynamically resize database buffer pools with IMS Buffer Pool Analyzer’s view of buffers by total buffer life, clients can see measurable CPU savings and performance improvement. By page-fixing buffers, IMS gains internal efficiencies and reduces the load on the entire z/OS system by avoiding paging spikes. One example is a client with an IMS program specification block (PSB) pool with large, infrequently used PSBs. During application scheduling, a PSB is read into the pool. If there’s no room, space must be reclaimed. Removing a paged-out PSB results in page faults and delays. Using large real memory and page-fixing the pool can improve performance. IMS 12 can use large memory for IMS log buffers to improve online logging throughput. Another log-related process where large real memory is useful is during dynamic database backout. As

IN A FLASH
the archived log data is read, it’s cached in data spaces. Using larger real memory to increase resources to back the data spaces could allow the read process more frequent success, thus reducing the need for batch backout.
Technologies like flash memory, which fill a role in the disk I/O hierarchy, are too slow to provide the benefits of large real memory. The fastest flash memory deployed is still 5 to 30 times slower than accessing data in the coupling facility and orders of magnitude slower than DRAM.

hÁRebinding application packages using the REBIND command hÁUsing 1 MB real storage page frames hÁMaking more use of persistent threads with the RELEASE(DEALLOCATE) option
Examples of persistent threads include both protected CICS* ENTRY threads and high-performance databaseaccess threads (DBATs) for distributed applications. This is a classic trade-off, with increases in real memory consumption leading to reduced CPU-resource consumption and a smaller monthly license charge for DB2 and the entire z/OS software stack. In addition, research showed a 5 to 10 percent improvement in CPU performance in DB2 10 versus DB2 9 through better memory management for remote/local applications. It also indicated up to a 10 percent improved CPU performance using high-performance DBAT, and a 26 percent CPU savings for SAP workloads by tuning the MAXKEEPD subsystem parameter.

Peak Performance and Availability
The System z stack excels at continuous availability. Large memory not only enables improved availability via faster recovery times but also poses new challenges like the collection of first-failure data-capture information. The stack rollout for highperformance diagnostics has been ongoing for years. Key developments have included high-performance SAN Volume Controller dump code in z/OS 1.12 and the secure parallel data transfer tool that can move large files quickly from clients to IBM. Today, DRAM-based real system memory is king, and large memory is the way to improve performance. Future memory technology will augment current real memory usage. Storage-class memory will bridge the gap between current real memory and disk subsystems. Technologies like flash memory, which fill a role in the disk I/O hierarchy,

are too slow to provide the benefits of large real memory. The fastest flash memory deployed is still 5 to 30 times slower than accessing data in the coupling facility and orders of magnitude slower than DRAM. In the future, the memory hierarchy will be reshuffled as new high-performance storage-class memory technologies are discovered. In the meantime, large real memory remains the most cost-effective way to improve the latency and eliminate the CPU cost associated with I/O activity. It provides the necessary glue that allows deployment of big insights, big data and real-time analytics.

LARGE REAL MEMORY PROVIDES THE NECESSARY GLUE THAT ALLOWS DEPLOYMENT OF BIG INSIGHTS, BIG DATA AND REAL-TIME ANALYTICS.
42
J U LY/AU G U S T 2 0 12 ibmsystemsmag.com/mainframe

Peter Sutton is an IBM Distinguished Engineer.


http://www.ibmsystemsmag.com/mainframe

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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