OMEGAMON II for SMS Tuning Guide, V540 - IBMpublib.boulder.ibm.com/tividd/td/ITOMEGAIIfSMS/.../PDF/GC32-9283-00.pdf · 2 OMEGAMON II for SMS Tuning Guide, Version 540 Registered trademarks

Tuning GuideOMEGAMON II® for SMS

Version 540

GC32-9283-00

August 2004

Candle Corporation100 North Sepulveda Blvd.

El Segundo, California 90245-9796

2 OMEGAMON II for SMS Tuning Guide, Version 540

Registered trademarks and service marks of Candle Corporation: AF/OPERATOR, AF/REMOTE, Availability Command Center, Candle, Candle CIRCUIT, Candle Command Center, Candle Direct logo, Candle eDelivery, Candle Electronic Customer Support, Candle logo, Candle Management Server, Candle Management Workstation, CandleLight, CandleNet, CandleNet Command Center, CandleNet eBusiness Platform, CandleNet Portal, CL/CONFERENCE, CL/SUPERSESSION, CommandWatch, CT, CT/Data Server, CT/DS, DELTAMON, DEXAN, eBA, eBA*ServiceMonitor, eBA*ServiceNetwork, eBusiness at the speed of light, eBusiness Assurance, eBusiness Institute, ELX, EPILOG, ESRA, ETEWatch, IntelliWatch, IntelliWatch Pinnacle, MQSecure, MQView, OMEGACENTER, OMEGAMON, OMEGAMON II, OMEGAMON Monitoring Agent, OMEGAMON Monitoring Agents, OMEGAVIEW, OMEGAVIEW II, PQEdit, Response Time Network, Roma, SitePulse, Solutions for Networked Applications, Solutions for Networked Businesses, TMA2000, Transplex, and Volcano.Trademarks and service marks of Candle Corporation: AF/Advanced Notification, AF/PERFORMER, Alert Adapter, Alert Adapter Plus, Alert Emitter, AMS, Amsys, AutoBridge, AUTOMATED FACILITIES, Availability Management Systems, Business Services Composer, Candle Alert, Candle Business Partner Logo, Candle Command Center/SentinelManager, Candle CommandPro, Candle eSupport, Candle Insight, Candle InterFlow, Candle Managing what matters most, Candle Service Suite, Candle Technologies, CandleNet, CandleNet 2000, CandleNet Conversion, CandleNet eBP, CandleNet eBP Access for S.W.I.F.T., CandleNet eBP Administrator, CandleNet eBP Broker Access for Mercator or MQSI, CandleNet eBP Configuration, CandleNet eBP Connector, CandleNet eBP File Transfer, CandleNet eBP Host Connect, CandleNet eBP Object Access, CandleNet eBP Object Browser, CandleNet eBP Secure Access, CandleNet eBP Service Directory, CandleNet eBP Universal Connector, CandleNet eBP Workflow Access, CandleNet eBusiness Assurance, CandleNet eBusiness Exchange, CandleNet eBusiness Platform Administrator, CandleNet eBusiness Platform Connector, CandleNet eBusiness Platform Connectors, CandleNet eBusiness Platform Powered by Roma Technology, CandleNet eBusiness Platform Service Directory, Candle Vision, CCC, CCP, CCR2, CEBA, CECS, CICAT, CL/ENGINE, CL/GATEWAY, CL/TECHNOLOGY, CMS, CMW, Command & Control, Connect-Notes, Connect-Two, CSA ANALYZER, CT/ALS, CT/Application Logic Services, CT/DCS, CT/Distributed Computing Services, CT/Engine, CT/Implementation Services, CT/IX, CT/Workbench, CT/Workstation Server, CT/WS, !DB Logo, !DB/DASD, !DB/EXPLAIN, !DB/MIGRATOR, !DB/QUICKCHANGE, !DB/QUICKCOMPARE, !DB/SMU, !DB/Tools, !DB/WORKBENCH, Design Network, e2e, eBA*SE, eBAA, eBAAuditor, eBAN, eBANetwork, eBAAPractice, eBP, eBusiness Assurance Network, eBusiness at the speed of light, eBusiness at the speed of light logo, eBusiness Exchange, eBX, End-to-End, eNotification, ENTERPRISE, Enterprise Candle Command Center, Enterprise Candle Management Workstation, Enterprise Reporter Plus, ER+, ERPNet, ETEWatch Customizer, HostBridge, InterFlow, Candle InterFlow, Lava Console, Managing what matters most, MessageMate, Messaging Mastered, Millennium Management Blueprint, MMNA, MQADMIN, MQEdit, MQEXPERT, MQMON, NBX, NC4, NetGlue, NetGlue Extra, NetMirror, NetScheduler, New Times, New Team, New Readiness, OMA, OMC Gateway, OMC Status Manager, OMEGACENTER Bridge, OMEGACENTER Gateway, OMEGACENTER Status Manager, OMEGAMON/e, OMEGAMON Management Center, OSM, PathWAI, PC COMPANION, Performance Pac, Powered by Roma Technology, PowerQ, PQConfiguration, PQScope, Roma Application Manager, Roma Broker, Roma BSP, Roma Connector, Roma Developer, Roma FS/A, Roma FS/Access, RomaNet, Roma Network, Roma Object Access, Roma Secure, Roma WF/Access, Roma Workflow Access, RTA, RTN, SentinelManager, Somerset, Somerset Systems, Status Monitor, The Millennium Alliance, The Millennium Alliance logo, The Millennium Management Network Alliance, Tracer, Unified Directory Services, WayPoint, and ZCopy.Trademarks and registered trademarks of other companies: AIX, DB2, MQSeries and WebSphere are registered trademarks of International Business Machines Corporation. Citrix, WinFrame, and ICA are registered trademarks of Citrix Systems, Inc. Multi-Win and MetaFrame are trademarks of Citrix Systems, Inc. SAP is a registered trademark and R/3 is a trademark of SAP AG. UNIX is a registered trademark in the U.S. and other countries, licensed exclusively through X/Open Company Ltd. HP-UX is a trademark of Hewlett-Packard Company. SunOS is a trademark of Sun Microsystems, Inc. All other company and product names used herein may be trademarks or registered trademarks of their respective owners.

Copyright © July 2004, Candle Corporation, a California corporation. All rights reserved. International rights secured.

Threaded Environment for AS/400, Patent No. 5,504,898; Data Server with Data Probes Employing Predicate Tests in Rule Statements (Event Driven Sampling), Patent No. 5,615,359; MVS/ESA Message Transport System Using the XCF Coupling Facility, Patent No. 5,754,856; Intelligent Remote Agent for Computer Performance Monitoring, Patent No. 5,781,703; Data Server with Event Driven Sampling, Patent No. 5,809,238; Threaded Environment for Computer Systems Without Native Threading Support, Patent No. 5,835,763; Object Procedure Messaging Facility, Patent No. 5,848,234; End-to-End Response Time Measurement for Computer Programs, Patent No. 5,991,705; Communications on a Network, Patent Pending; Improved Message Queuing Based Network Computing Architecture, Patent Pending; User Interface for System Management Applications, Patent Pending.

NOTICE: This documentation is provided with RESTRICTED RIGHTS. Use, duplication, or disclosure by the Government is subject to restrictions set forth in the applicable license agreement and/or the applicable government rights clause.This documentation contains confidential, proprietary information of Candle Corporation that is licensed for your internal use only. Any unauthorized use, duplication, or disclosure is unlawful.

Contents 3

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Candle Customer Service and Satisfaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

What’s New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 2. Setting Data Collection Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13CACHINTV Parameter in Member KDFDEVIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14APPLINTV Parameter in Member KDFDEVIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15RESPINTV Parameter in Member KDFDEVIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15FREQ Parameter in Member KDFDEVIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16APPLHIST, DSNHIST, DASDHIST Parameters in Member KDFDEVIN . . . . . . . . . . . .17SMFRECN and SMFDINTV Parameters in Member KDFDEVIN . . . . . . . . . . . . . . . . . .18Data Collection Member KDFDEVSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19Data Collection Member KDFDSCIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Data Collection Member KDFPG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Chapter 3. Enhancing Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Monitoring Critical Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Setting Auto Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Chapter 4. Connecting with OMEGAVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Setting the OMEGAVIEW Refresh Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Contents


Preface 5

Preface

About this documentThis Tuning Guide tells you how you can enhance the performance of OMEGAMON II® for SMS. By following these recommendations, you can achieve the maximum benefit from OMEGAMON II for SMS while using the minimum amount of resources at your site.

Who should read this bookThis guide is intended for those with OMEGAMON II for SMS product administrator authority who are responsible for setting run-time parameters and monitoring options.

Document set information� OMEGAMON II for SMS Configuration and Customization Guide, V520,

DF51-5680

� OMEGAMON II for SMS User’s Guide, V520, DF54-6374

� OMEGAMON II for SMS Administrator’s Guide, V520, DF99-6373

� OMEGAMON II for SMS Tuning Guide, V520, DF55-6375

� OMEGAMON II for SMS Quick Reference, V500,DF13-4955

Where to look for more informationFor more information related to this product, please see the

� technical documentation CD-ROM that came with your product

� technical documentation information available on the Candle Web site at www.candle.com

� online help provided with this product

P

Candle Customer Service and Satisfaction


Candle Customer Service and Satisfaction

BackgroundTo assist you in making effective use of our products, Candle offers a variety of easy-to-use online support resources.

The Candle Web site provides direct links to a variety of support tools that include a range of services. For example, you can find information about training, maintenance plans, consulting and services, and other useful support resources. Refer to the Candle web site at www.candle.com for detailed customer service and support information.

Candle Customer Service and Satisfaction contactsYou will find the most current information about how to contact Candle Customer Support by telephone or e-mail on the Candle Web site. Go to the www.candle.com support section and find the link to Support Contacts, to locate your regional support center.

http://www.candle.com

http://www.candle.com

What’s New 7

What’s New

OMEGAMON II® for SMS Version 540 includes the following product and documentation changes:

OMEGAMON II® for SMSVersion 540 includes the following enhancements:

Performance Improvements � Reduced CPU utilization in the Candle Subsystem.

� The performance enhancement to the Storage Management Status and Overview panel, KDFS0100, greatly improves response time and decreases CPU utilization.

� Significantly improved response time on the Dataset MSR panel, KDFS0420.

Free Space Exclusion Enhancement� Modified the way OMEGAMON II calculates available space statistics so that only

space that is available for allocation will be included in the calculations

� Reported values (for SMS storage groups only). This modification has the greatest effect on the SMS Storage Group Space Summary. Volumes with the following SMS status are not included in any calculation used to determine the amount of free (available) space:

– disable– disable new– not connected– (in the case of a JES3 system) quiesce and quiesce new – volumes that have not been SMS converted

� In panels that previously showed a volume as being converted to SMS, the actual SMS volume status is displayed

W


IBM 2105 Storage Subsystem (Shark) Enhancement� Added new code that includes the Parallel Access Volume (PAV) feature when reports

are being created. PAV alias devices are not visible from the Omegamon II for SMS product. At the volume level, all statistics are be rolled up to the PAV base device. At the dataset level, all I/O are attributed to the base device. This is the manner in which RMF reports activity in a PAV environment.

Physical Volume Group Reporting� Added a new report feature (and a new action code). Several new panels are included

in this enhancement. Each new panel displays reports that allow you to view information about the logical volumes on a physical disk. When this option is available, an action code appears on the panel as P=Physical Volumes.

This enhancement supports EMC Symmetrix and IBM Shark (2105) devices. If you attempt to navigate to the physical volume group panel for a device that is not supported, a pop-up error message is presented.

Note: Obtaining EMC Symmetric data can only be done in conjunction with the applicable EMC hardware and software. The hardware required is an EMC Symmetrix at the appropriate microcode level. Also required are the EMC Symmetrix Control Facility runtime libraries available from EMC.

FICON Support Enhancement� Added a new panel to support Channel Path Measurement Facility (CPMF), which

supports new fiber channels. When the system is running in compatibility mode, the CPMF measurements are the same as they were prior to this enhancement. However, when CPMF measurements are in extended mode, a new set of metrics are used to measure channel utilization. These measurements are:

– · Bus Cycle– · Work Unit– · Write Data Unit

– · Read Data Unit

The new panel (KDFS0135) Channel Path Status Extended, may be thought of as a partner to KDFS0130, Channel Path Status, the current channel status panel. When you navigate to a channel status display panel, the product dynamically determines the CPMF measurement mode, and invokes either KDFS0130 or KDFS0135 depending upon the CPMF measurement mode in effect.

Virtual Tape Server Support � Added virtual tape server support. The Virtual Tape Server (VTS) is a hardware

device that allows improved performance in regards to tape datasets. The IBM VTS writes an SMF record every hour. The data in this SMF record will be the basis of VTS support in Omegamon II for SMS. This SMF record contains data for all systems in the complex accessing the VTS, (potentially a roll-up of multiple MVS systems). The data are stored in the PDS and available in real-time (at least as of last SMF record written), historic, and trend modes.

What’s New 9

� There are several new panels supporting VTS real-time data. Each of these panels has corresponding historic and trending panels. Additionally, there are over 30 new thresholds associated with the data.

Channel Details

This enhancement provides a new Channel Path Details pop-up menu. The pop-up provides you with metrics not previously available. The new metrics include partition level views for those items currently displayed on the Channel Path Status Extended panel where appropriate. For CPMF group 2 channels, the read and write rates are displayed for both the partition and the complex.

Note: This pop-up is available only on MVS systems running in CPMF extended mode.

Documentation The following documentation changes are effective beginning with version 540:

� The Version Release Guide will no longer be published. This What’s New section replaces that book.

� The OMEGAMON II® for SMS Messages Manual will no longer be published as a separate book. The messages are now included in the Candle Products Messages Manual.

� With version 540, Candle Corporation has moved OMEGAMON II for SMS manuals from IBM BookMaster to Adobe FrameMaker. This move was made to better enable us to address our customers’ needs by providing tools that enhance productivity.

One of the results of the move is that it is no longer possible to create BookManager versions of the OMEGAMON II for SMS manuals. However, the manuals remain available online in the Adobe PDF version on CD-ROM and are also available on the Candle Corporation website at www.Candle.com.

The documentation CD being provided with this release has robust and easy-to-use search capabilities. You can search for information in multiple volumes, multiple versions, and across products. The CD also provides easy setup of search indexes with a single click of the mouse.

If you want to order printed copies of the documentation, please contact your Candle Support Services representative.


Overview 11

Overview

This Tuning Guide tells you how you can achieve the maximum benefit from OMEGAMON II for SMS, while using the minimum amount of resources at your site. The following topics are discussed:

� OMEGAMON II for SMS data collection parameters that affect CPU, I/O, and storage utilization.

� OMEGAMON II for SMS features that affect response time.

� OMEGAVIEW® use of OMEGAMON II for SMS that affects resource usage.

1


Setting Data Collection Parameters 13

Setting Data Collection Parameters

OverviewThe Candle Management Server® (Candle Management Server™) runtime data set hilev.RKANPAR contains members that control the functions of Candle Management Server. Some members specifically control the collection of data for OMEGAMON II for SMS. To effectively monitor storage resources, you can adjust OMEGAMON II for SMS options based on the needs of your site. In many cases, you may find the default collection options to be overly aggressive. This was done to ensure that status changes in storage resources are detected and reported by OMEGAMON II for SMS as quickly as possible. The discussion of collection parameters in the following sections can help you to set the collection options that best enable you to balance your monitoring requirements with the resources required to perform that level of monitoring. Adjustments to these parameters affect CPU, I/O, and virtual storage resources required by the Candle Management Server address space.

Chapter ContentsCACHINTV Parameter in Member KDFDEVIN. . . . . . . . . . . . . . . . . . . . . 14APPLINTV Parameter in Member KDFDEVIN . . . . . . . . . . . . . . . . . . . . . 15RESPINTV Parameter in Member KDFDEVIN . . . . . . . . . . . . . . . . . . . . . 15FREQ Parameter in Member KDFDEVIN . . . . . . . . . . . . . . . . . . . . . . . . . 16APPLHIST, DSNHIST, DASDHIST Parameters in Member KDFDEVIN . . 17SMFRECN and SMFDINTV Parameters in Member KDFDEVIN. . . . . . . . 18Data Collection Member KDFDEVSU. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Data Collection Member KDFDSCIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Data Collection Member KDFPG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2

CACHINTV Parameter in Member KDFDEVIN


CACHINTV Parameter in Member KDFDEVIN

Definition

This is the cache collection interval. It controls how frequently OMEGAMON II for SMS recollects cache statistics for cached volumes and control units.

Default

The default value is 300 seconds (5 minutes).

Action

If changes in the cache statistics for control units and volumes can be viewed less frequently, increase this interval.

Benefit

Increasing the cache collection interval reduces overhead required to collect cache statistics, lowering CPU utilization and DASD volume I/Os within the Candle Management Server address space.


APPLINTV Parameter in Member KDFDEVIN

APPLINTV Parameter in Member KDFDEVIN

RESPINTV Parameter in Member KDFDEVIN

Definition

This is the application collection interval. It controls how frequently OMEGAMON II for SMS rebuilds the list of volumes and data sets used by the monitored application. This parameter is most effective for determining changes in the volumes and data sets used by monitored applications because of dynamic allocation and deallocation.

Default

The default value is 300 seconds (5 minutes).

Action

When you monitor applications that are relatively static in volume and data set usage, increase this interval.

Benefit

Increasing the application collection interval decreases CPU utilization within the Candle Management Server address space.

Definition

This is the response time collection interval. It controls how frequently OMEGAMON II for SMS recollects response time statistics for DASD volumes.

Default

The default value is 10 seconds.

Action

If changes in response time statistics for your DASD volumes can be viewed less frequently, increase this interval.

Benefit

Increasing the response time collection interval reduces the overhead required to collect DASD response times, decreasing CPU utilization within the Candle Management Server address space.

FREQ Parameter in Member KDFDEVIN


FREQ Parameter in Member KDFDEVIN

Definition

This is the space collection frequency. It controls how frequently OMEGAMON II for SMS recollects space and fragmentation statistics for DASD volumes.

The space collection interval is calculated as follows:

FREQ * RESPINTV

Default

The default value is RMF, which means collection takes place once every RMF interval.

If the FREQ parameter is omitted, or is coded as FREQ(RMF), space collection takes place once every RMF interval. A specific value for FREQ sets a collection frequency that has no direct relation to the RMF interval.

Action

Candle recommends that you set FREQ to once per RMF interval. Either omit the FREQ parameter or set the FREQ parameter to RMF:

FREQ(RMF)

Benefit

Increasing FREQ reduces the overhead required to collect space information by lowering both CPU utilization and DASD volume I/Os within the Candle Management Server address space.


APPLHIST, DSNHIST, DASDHIST Parameters in Member KDFDEVIN

APPLHIST, DSNHIST, DASDHIST Parameters in Member KDFDEVIN

Definition

These parameters control whether OMEGAMON II for SMS writes application, data set, and DASD information to the Candle Management Server persistent data store (PDS) at the end of each RMF interval. When historical information is written to the PDS, you can view it online in OMEGAMON II for SMS.

Default

A default value of Yes is generated for these three parameters. However, if you remove these parameters from member KDFDEVIN, the default becomes No and there is no recording to the PDS.

Action

If you do not view historical information online with OMEGAMON II for SMS, ensure that these parameters are set to No.

Benefit

Disabling recording to the PDS eliminates the unnecessary CPU and I/O overhead required to view information that is not used.

SMFRECN and SMFDINTV Parameters in Member KDFDEVIN


SMFRECN and SMFDINTV Parameters in Member KDFDEVIN

Definition

These parameters control the recording of DASD cache, response time, and space and fragmentation statistics to SMF. SMFRECN identifies the SMF record number to use for recording and SMFDINTV specifies the recording interval.

Default

SMFRECN has no default. You must specify an SMF record number to enable recording.

When the SMF interval field is left blank, CICAT™ installation of OMEGAMON II for SMS generates SMFDINTV(RMF) which sets the SMF interval equal to the RMF interval. However, if you remove SMFDINTV from member KDFDEVIN, SMF recording is disabled.

For SMFDINTV to take effect, the SMF record number must be specified in SMFRECN.

Action

Set these parameters to enable SMF recording while disabling recording to the PDS (see preceding section, “APPLHIST, DSNHIST, DASDHIST Parameters in Member KDFDEVIN” on page 17).

Benefit

You can produce historical reports using Candle-provided SAS sample code, without recording in the Candle Management Server PDS. This is a more cost-effective alternative for historical reporting because it uses simple sequential files rather than the indexed file structure of the PDS which support direct queries for online reports.


Data Collection Member KDFDEVSU

Data Collection Member KDFDEVSU

Definition

Use this member to exclude some volumes from space and fragmentation statistics collection.

Default

KDFDEVSU has no default values. You add specific volumes to the member for which you want no space data collection.

Action

In member KDFDEVSU, place system residence volumes, paging volumes, and other volumes for which there are typically no space and fragmentation issues.

The cross-system DASD reporting feature of OMEGAMON II for SMS shows response time for shared DASD volumes, from all systems sharing access to these volumes, on a single display. As part of implementing this feature, ensure that space collection is only performed for shared DASD volumes from one Candle Management Server on one system.

Benefit

Excluding volumes that do not experience changes in space or fragmentation status reduces CPU and I/O overhead required to monitor these volumes. Collecting statistics from one CMS on one system eliminates redundant collection overhead from multiple systems.

Data Collection Member KDFDSCIN


Data Collection Member KDFDSCIN

Definition

This member controls data set response time and cache statistics collection for each volume individually. For each volume you can specify one of the following monitoring methods:

1. Track every I/O to every data set on the volume and maintain statistics for each I/O.

This is the most accurate method but causes the most resource consumption.

2. Track every nth I/O to the volume based upon a specified sample count, and maintain

statistics only for each sample observed.

This provides a reasonable overview, while reducing the overhead required to monitor

every I/O.

3. Based upon a specified MSR (millisecond response time) threshold, only track I/Os to the

volume that exceed the threshold.

This is a cost effective way to track data set statistics when the volume is not meeting your response time objectives. It ensures that critical statistics are maintained during periods of response time degradation, without incurring overhead when response is satisfactory.

Default

The default has no monitoring.

Action

For each volume at your site, examine the monitoring requirements and choose from one of the three methods listed above. Candle recommends MSR threshold monitoring (item 3 above) for your DASD volumes. You can set MSR thresholds individually for each volume, as appropriate for your site.

Benefit

Choosing the appropriate level of data set response time monitoring for each volume individually affects CPU utilization, I/Os, and working set size within the Candle Management Server and Candle sub-system address spaces.


Data Collection Member KDFPG


Definition

This member controls the recording of information to the Candle Management Server persistent data store (PDS). If historical information is recorded to the PDS, you can view it online. OMEGAMON II for SMS can record three different tables (corresponding to record types) to the PDS: application information, volume statistics, and data set statistics. Application and volume information is grouped into one datastore, while data set information is recorded into another datastore.

A data store can be comprised of a single or multiple data sets, using one of these two processes:

Wrapping

When a single data set is defined, wrapping occurs when the data set becomes full. New records replace the oldest records in the data set. The oldest records and their associated indexes must be located and deleted before the new records are inserted.

Switching

When multiple data sets are defined, switching occurs when a data set becomes full. Recording stops on the full data set and resumes on the next empty data set. When recording begins on the last empty data set, the data set containing the oldest data is emptied. This ensures that space is available for switching so that recording continues when the last data set fills.

Default

The default is Switching.

When you specify more that one data set for a group on the CICAT customization panel titled Modify and Review Group Specifications, KPDPPDS3, switching is enabled.

Action

If PDS recording is enabled at your site, ensure that switching (rather than wrapping) is enabled and that a minimum of three data sets are used for each PDS group.

Benefit

Switching can be as much as 5–6 times less resource intensive than wrapping.



Enhancing Response Time 23

Enhancing Response Time

OverviewBy appropriately setting application monitoring and the autorefresh interval, you can enhance OMEGAMON II for SMS response time.

Chapter ContentsMonitoring Critical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Setting Auto Update Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3

Monitoring Critical Applications


Monitoring Critical Applications

Setting Auto Update Interval

Definition

When you monitor a large number of applications, response time on the main status panel (KDFS0100) is lengthened. This is because of the overhead required to process and status all the data sets and volumes used by an application from the utilization (response time and caching) and capacity (space and fragmentation) perspectives.

Action

Reserve application monitoring for critical workloads that require this level of monitoring rather than using it for all workloads.

Definition

The auto update interval specifies at what interval OMEGAMON II for SMS display panels are automatically refreshed.

Action

Ensure that refreshes occur frequently enough to indicate changes in your storage resource status, without occurring so frequently that they cause excessive overhead in OMEGAMON II for SMS.

You specify the value in the Auto Refresh Interval field on the Session Defaults panel under the OMEGAMON II for SMS Options pulldown (fastballs OCS).

Connecting with OMEGAVIEW 25

Connecting with OMEGAVIEW

OverviewBy appropriately setting the OMEGAVIEW refresh interval, you can enhance OMEGAMON II for SMS performance.

Chapter ContentsSetting the OMEGAVIEW Refresh Interval . . . . . . . . . . . . . . . . . . . . . . . . 26

4

Setting the OMEGAVIEW Refresh Interval


Setting the OMEGAVIEW Refresh Interval

Definition

The OMEGAVIEW refresh interval is the amount of time that elapses between status indicator changes. This refresh interval directly affects resource utilization within OMEGAMON II for SMS. Defining the OMEGAVIEW to OMEGAMON II for SMS connection with a low refresh interval, can cause excessive processing within OMEGAMON II for SMS.

Action

To achieve maximum performance when connected to OMEGAVIEW, set the OMEGAVIEW refresh interval to the largest value that is reasonable and consistent with your site’s requirements. Refer to Configuration Manager information in the OMEGAVIEW documentation set for specific instructions.

OMEGAMON II for SMS Tuning Guide, V540 - IBMpublib.boulder.ibm.com/tividd/td/ITOMEGAIIfSMS/.../PDF/GC32-9283-00.pdf · 2 OMEGAMON II for SMS Tuning Guide, Version 540 Registered trademarks

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