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Purpose of this Document The intent of this document is to help provide guidance in terms of IBM i operating system performance, capacity planning information, and tips to obtain optimal performance on IBM i operating system. This document is typically updated with each new release or more often if needed. This October 2008 edition of the IBM i V6.1 Performance Capabilities Reference Guide is an update to the April 2008 edition to reflect new product functions announced on October 7, 2008. This
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Chapter 1. Introduction IBM System i and IBM System p platforms unified the value of their servers into a single, powerful lineup of servers based on industry leading POWER6 processor technology with support for IBM i operating system (formerly known as i5/OS), IBM AIX and Linux for Power. Following along with this exciting unification are a number of naming changes to the formerly named i5/OS, now officially called IBM i operating system. Specifically, recent versions of the operating system
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versions. The primary public performance information web site is found at: http://www.ibm.com/systems/i/advantages/perfmgmt/index.html IBM i 6.1 Performance Capabilities Reference - January/April/October 2008 © Copyright IBM Corp. 2008 Chapter 1- Introduction 14
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Chapter 2. iSeries and AS/400 RISC Server Model Performance Behavior 2.1 Overview iSeries and AS/400 servers are intended for use primarily in client/server or other non-interactive work environments such as batch, business intelligence, network computing etc. 5250-based interactive work can be run on these servers, but with limitations. With iSeries and AS/400 servers, interactive capacity can be increased with the purchase of additional interactive features. Interactive work is defined as a
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interactive utilization - an average for the interval. Since average utilization does not indicate potential problems associated with peak activity, a second metric (SCIFTE) reports the amount of interactive utilization that occurred above threshold. Also, interactive feature utilization was reported when printing a System Report generated from Collection Services data. In addition, Management Central now monitors interactive CPU relative to the system/partition capacity. Also in V4R5, a new
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2.1.4 V5R2 and V5R1 There were several new iSeries 8xx and 270 server model additions in V5R1 and the i890 in V5R2. However, with the exception of the DSD models, the underlying server behavior did not change from V4R5. All 27x and 8xx models, including the new i890 utilize the same server behavior algorithm that was announced with the first 8xx models supported by V4R5. For more details on these new models, please refer to Appendix C, “CPW, CIW and MCU Values for iSeries”. Five new iSeries
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The new server algorithm only applies to the new hardware available in V4R5 (2xx, 8xx and SBx models). The behavior of all other hardware, such as the 7xx models is unchanged (see section 2.2.3 Existing Model section for 7xx algorithm). 2.2.2 Choosing Between Similarly Rated Systems Sometimes it is necessary to choose between two systems that have similar CPW values but different processor megahertz (MHz) values or L2 cache sizes. If your applications tend to be compute intensive such as Java,
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grows at a rate which can eventually eliminate server/batch capacity and limit additional interactive growth. It is best for interactive workloads to execute below (less than) the knee of the curve. (However, for those models having the knee at 1/3 of the total interactive capacity, satisfactory performance can be achieved.) The following graph illustrates these points. Model 7xx and 9/98 Model 170 CPU CPU Distribution vs. Interactive Utilization 100 Announced Capacities Stop Here! 80 Ava
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2.3 Server Model Differences Server models were designed for a client/server workload and to accommodate an interactive workload. When the interactive workload exceeds an interactive CPW threshold (the “knee of the curve”) the client/server processing performance of the system becomes increasingly impacted at an accelerating rate beyond the knee as interactive workload continues to build. Once the interactive workload reaches the maximum interactive CPW value, all the CPU cycles are being use
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IBM Power Systems
Performance Capabilities Reference
IBM i operating system Version 6.1
January/April/October 2008
This
document is intended for use by qualified performance related programmers or analysts from
TM
IBM, IBM Business Partners and IBM customers using the IBM Power Systems platform
running IBM i operating system. Information in this document may be readily shared with
IBM i customers to understand the performance and tuning factors in IBM i operating system
6.1 and earlier wh
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Note! Before using this information, be sure to read the general information under “Special Notices.” Twenty Fifth Edition (January/April/October 2008) SC41-0607-13 This edition applies to IBM i operating System V6.1 running on IBM Power Systems. You can request a copy of this document by download from IBM i Center via the System i Internet site at: http://www.ibm.com/systems/i/ . The Version 5 Release 1 and Version 4 Release 5 Performance Capabilities Guides are also available on the IBM iSe
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Table of Contents Special Notices .................................................................... 10 Purpose of this Document ........................................................... 12 Chapter 1. Introduction ............................................................ 13 Chapter 2. iSeries and AS/400 RISC Server Model Performance Behavior ................. 14 2.1 Overview ..................................................................... 14 2.1.1 Interactive Indicators and Metric
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Chapter 5. Communications Performance ............................................. 63 5.2 Communication Performance Test Environment ....................................... 65 5.5 TCP/IP Secure Performance ....................................................... 68 5.6 Performance Observations and Tips ................................................. 71 5.7 APPC, ICF, CPI-C, and Anynet .................................................... 73 5.8 HPR and Enterprise extender considerations .......
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10.2 DB2 for i5/OS access with ODBC ................................................ 155 References for ODBC ........................................................... 157 Chapter 11. Domino on i .......................................................... 158 11.1 Domino Workload Descriptions ................................................. 159 11.2 Domino 8 ................................................................... 160 11.3 Domino 7 ................................................
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14.1.3.1 571B RAID5 vs RAID6 - 10 15K 35GB DASD ................................ 195 14.1.3.2 571B IOP vs IOPLESS - 10 15K 35GB DASD ................................. 195 14.1.4 571B, 5709, 573D, 5703, 2780 IOA Comparison Chart .......................... 196 14.1.5 Comparing Current 2780/574F with the new 571E/574F and 571F/575B NOTE: iV5R3 has support for the features in this section but all of our performance measurements were done on iV5R4 systems. For information on the supported featur
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15.3 Workloads .................................................................. 245 15.4 Comparing Performance Data ................................................... 246 15.5 Lower Performing Backup Devices ............................................... 247 15.6 Medium & High Performing Backup Devices ...................................... 247 15.7 Ultra High Performing Backup Devices ........................................... 247 15.8 The Use of Multiple Backup Devices .............
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17.2.4 Virtual Ethernet Connections: .............................................. 284 17.2.5 IXS/IXA IOP Resource: ................................................... 285 17.3 System i memory rules of thumb for IXS/IXA and iSCSI attached servers. ................ 285 17.3.1 IXS and IXA attached servers: ............................................... 285 17.3.2 iSCSI attached servers: .................................................... 285 17.4 Disk I/O CPU Cost ..............................
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21.1 Switchable IASP’s ............................................................ 327 21.2 Geographic Mirroring .......................................................... 329 Chapter 22. IBM Systems Workload Estimator ...................................... 334 22.1 Overview .................................................................... 334 22.2 Merging PM for System i data into the Estimator .................................... 335 22.3 Estimator Access .................................
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Special Notices DISCLAIMER NOTICE Performance is based on measurements and projections using standard IBM benchmarks in a controlled environment. This information is presented along with general recommendations to assist the reader to have a better understanding of IBM(*) products. The actual throughput or performance that any user will experience will vary depending upon considerations such as the amount of multiprogramming in the user's job stream, the I/O configuration, the storage configura
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The following terms, which may or may not be denoted by an asterisk (*) in this publication, are trademarks of the IBM Corporation. iSeries or AS/400 System/370 Operating System/400 C/400 IPDS i5/OS OS/400 COBOL/400 Application System/400 System i5 RPG/400 OfficeVision System i CallPath Facsimile Support/400 PS/2 DRDA Distributed Relational Database Architecture OS/2 SQL/400 Advanced Function Printing DB2 ImagePlus Operational Assistant AFP VTAM Client Series IBM APPN Workstation Remote IPL/400
