IBM Systems Magazine, Mainframe Edition - November/December 2012 - 10

Insider
One such approach is to structure LPARs and the workload to separate the low-importance work from the higher-importance work as much as possible and make sure the balance is correct for your needs. This isn’t optimal, but if your main goal is to reduce costs, it might be a worthwhile trade-off. For example, a CEC with four LPARs might have two of them running online and high-importance batch, one running medium-importance batch and one running low-importance batch. The available CPU would be shared out by setting the weights for the LPARs in such a way that the LPAR running low-importance work has a low share of the CPU when the demand on other LPARs is high. However, when the demand from other LPARs is low, it has access to more shared logical processors than the weight requires so it can use more. Setting weights and shared logical processors in this way, while avoiding limitations on the higherimportance LPARs, is complex but, in the absence of other tools, might be necessary. Given that workload separation and LPAR structuring is in place, some operator commands can then be used to favor the higher-importance workloads during monthly peak periods. If you use Job Entry Subsystem ( JES) initiators, you can use JES commands to limit the number of initiators of a given class—typically on the low-importance LPAR—during periods of heavy activity. If you use Workload Manager (WLM) initiators, you can limit the number of concurrent jobs on an LPAR in a

THE COMPLEXITY OF A MODERN DATA CENTER
is simply too much to realistically control manually, no matter how efficient and knowledgeable your operators and support staff are.
job class or stop selecting jobs in a particular service class or job class on a specified LPAR. If your installation has a predictable monthly peak, such as three days of afternoons and evenings for month-end processing, you might consider putting these limits on for those times and those days, rather than leaving the decision to the judgment of operators. The problem, of course, is that these manual approaches are severely limited by the information and the timeliness of that information available to operations in order for them to make a reasonable decision. For example, as we noted, there’s no easy way to know when the four-hour rolling average on an LPAR or a group of LPARs is approaching the cap level, so you might be restricting batch unnecessarily or at the wrong times. If your primary objective is to provide good service to your critical online systems and batch but you’d also like to save money, you can still do so to some degree by setting the capping level fairly high so that you rarely, if ever, run into it during critical business processing.

A Better Way However, none of these options is satisfactory. So what else can you do? A more effective solution requires intelligent automation software that can make decisions on the fly with full knowledge of what’s going on at that specific moment in terms of capacity and demand. A modern data center typically runs thousands of batch jobs each day, spread over a number of LPARs, in addition to numerous online transactions and Time Sharing Option sessions. The complexity of such an environment is simply too much to realistically control manually, no matter how efficient and knowledgeable your operators and support staff are. Automation software can measure the four-hour rolling average, know when it’s approaching the capping level, recognize peaks before they become peaks and take appropriate action before the usage becomes a problem. These actions can smooth out usage spikes and, in fact, allow you to run at a lower capping level than otherwise practical, without sacrificing your service levels. Therefore, you get the full benefits of subcapacity pricing.

ON THE WEB
IBM links to ISV products that help with subcapacity pricing. See “ISV Pricing Tools” at www.ibm.com/systems/z/resources/swprice/.

Martin Wills is a 40-year veteran of batch processing who consults on batch practices. He has worked as a product specialist for MVS Solutions Inc.

10

NOVEMBER/DECEMBER 2012

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IBM Systems Magazine, Mainframe Edition - November/December 2012

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe Edition - November/December 2012

IBM Systems Magazine, Mainframe Edition - November/December 2012
Table of Contents
Editor's Desk: Been There, Done That
IBM Perspective: Not All Clouds Are Designed Equal
Insider: What's Really Driving Peak CPU Usage?
Focus on Storage: The DS8870 Provides up to Three Times the Performance of Its Predecessor
Case Study: A Capital Investment: DTCC implements tools to ensure its networking infrastructure is ready for anything
Cover Story: A Clear Vision for Cloud: System z GM Doug Balog on why zEnterprise provides a firm foundation for a secure cloud
Feature: Overcoming Cloud Obstacles: The benefits far outweigh the challenges associated with cloud integration
Tech Corner: From Silicon to Architecture, zEC12 Innovations Push the Envelope
Administrator: IBM zAware Extends z/OS Resilience to Another Level
Solutions: Attach Facility; DataSniff; AutoPilot; Eclipse; Correlog Enterprise Server 5.1
Advertisers Index
Stop Run: IBM Distinguished Engineer Joe Temple Reflects on His Juggling Past
Reference Point - Global Events, Education, Resources for Power Systems
Smarter Computing
2013 Mainframe Buyer's Guide Index
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Intro
IBM Systems Magazine, Mainframe Edition - November/December 2012 - IBM Systems Magazine, Mainframe Edition - November/December 2012
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Table of Contents
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 5
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Editor's Desk: Been There, Done That
IBM Systems Magazine, Mainframe Edition - November/December 2012 - IBM Perspective: Not All Clouds Are Designed Equal
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Insider: What's Really Driving Peak CPU Usage?
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BB1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BB2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 9
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 10
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Focus on Storage: The DS8870 Provides up to Three Times the Performance of Its Predecessor
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 12
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 13
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Case Study: A Capital Investment: DTCC implements tools to ensure its networking infrastructure is ready for anything
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 15
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 16
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 17
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 18
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 19
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover Story: A Clear Vision for Cloud: System z GM Doug Balog on why zEnterprise provides a firm foundation for a secure cloud
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 21
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 22
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 23
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 24
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 25
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Feature: Overcoming Cloud Obstacles: The benefits far outweigh the challenges associated with cloud integration
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 27
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 28
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 29
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Tech Corner: From Silicon to Architecture, zEC12 Innovations Push the Envelope
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 31
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 32
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 33
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Administrator: IBM zAware Extends z/OS Resilience to Another Level
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 35
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 36
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 37
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Solutions: Attach Facility; DataSniff; AutoPilot; Eclipse; Correlog Enterprise Server 5.1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Advertisers Index
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Stop Run: IBM Distinguished Engineer Joe Temple Reflects on His Juggling Past
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Reference Point - Global Events, Education, Resources for Power Systems
IBM Systems Magazine, Mainframe Edition - November/December 2012 - RF2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Smarter Computing
IBM Systems Magazine, Mainframe Edition - November/December 2012 - SC2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S5
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S6
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S7
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S8
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S9
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S10
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S11
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S12
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S13
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S14
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S15
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S16
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S17
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S18
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S19
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S20
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S21
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S22
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S23
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S24
IBM Systems Magazine, Mainframe Edition - November/December 2012 - SC3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - SC4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 2013 Mainframe Buyer's Guide Index
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BG2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BG3
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