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DB2 pureScale
DB2 pureScale reduces the risk and cost of business growth by providing unlimited capacity, continuous availability, and
application transparency. DB2 pureScale on IBM Power Systems incorporates PowerHA pureScale technology to deliver levels of
database scalability and availability unmatched on UNIX or x86 systems. This complements DB2 for z/OS and System z, the undisputed
leader in total system availability, scalability, security and reliability.
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08 Oct 2009 |
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UNIX network performance analysis
Knowing your UNIX network layout will go a long way with understanding your
network and how it operates. But what happens when the performance of your UNIX
network and the speed at which you can transfer files or connect to services suddenly reduces? How do you diagnose the issues and work out where in your network the problems lie? This article looks at some quick methods for finding and identifying performance issues and the steps to start resolving them.
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Articles |
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08 Sep 2009 |
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Monitoring logs and command output
Monitoring system logs or the status of a command that produces
file or directory output are common tasks for systems
administrators. Two popular open source tools simplify these
activities for modern systems administrators: the multitail and watch
commands. Both are terminal-oriented commands, which means
that they are easily ported to most UNIX or UNIX-like systems
because they do not depend on any specific graphical desktop
environment.
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Articles |
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25 Aug 2009 |
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Configuring Active Memory Sharing from a customer's experience
Share the experience of being part of IBM's Early Ship Program for Active Memory
Sharing on POWER6. See how AMS was configured and deployed in a customer's non-production AIX lab environment.
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Articles |
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04 Aug 2009 |
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A memory-related issue unfolded using performance tools for AIX
Performance metrics of a system are based purely on what is expected from it and
to what extent a computer system stands up to those expectations. The case study
presented in this article is intended to discuss a memory-related
issue faced by one of the customers and the steps followed to pin down the root cause of the problem.
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Articles |
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28 Jul 2009 |
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Dynamic tracing facility
Problem determinations of the failures that occur in production environment pose a
difficult challenge because of the complex environment and numerous different software
stacks that interact with each other.This article provides a brief
introduction to the Solaris dynamic trace facility and the ProbeVue facility on AIX and illustrates its use with examples.
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Articles |
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21 Jul 2009 |
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AIX 6.1, Solaris 10, and HP-UX and the System p
In recent years, HP, Sun, and IBM have all released new versions of their
commercial UNIX-based operating systems. This article compares and contrasts some of
the innovations in their releases. Learn the differences on how to work with certain
tasks, such as networking and performance tuning. Also, see at a high level some of the virtualization differences among these big three.
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Articles |
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26 May 2009 |
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Advanced performance tuning concepts
The performance of even the best application suffers if the underlying host is not configured properly. This article looks at the four key areas of performance tuning and identifies what to watch for in each of them. In addition, Java-based applications bring other performance tuning requirements with them, especially the
garbage collection cycle. This article also looks at what you need to know about garbage collection.
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Articles |
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28 Apr 2009 |
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Thanks for the memory
Running out of Java heap isn't the only cause of a java.lang.OutOfMemoryError. If native memory runs out, OutOfMemoryErrors that your normal debugging techniques won't be able
to solve can occur. This article explains what native memory is, how the Java runtime
uses it, what running out of it looks like, and how to debug a native OutOfMemoryError
on AIX. A companion article covers the same topics for Linux and Windows systems.
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Articles |
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21 Apr 2009 |
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10 tips for sensible systems administration
Benjamin Franklin: scientist, scholar, statesman, and . . . systems administrator?
Yes, 200 years or so before the birth of UNIX, Franklin scribed sage advice to keep
systems humming. Here are 10 of Franklin's more notable tips.
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Articles |
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10 Mar 2009 |
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10 steps to UNIX nirvana
Discover several time-saving tips and freely available tools that both new
and experienced C++ developers can use.
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Articles |
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03 Mar 2009 |
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Performance Monitor Counter data analysis using Counter Analyzer
To understand what happens inside a processor when an application
is executed, processor architects designed a set of special registers to
count the events taking place when processors are executing instructions.
These registers, called the Performance Monitor Counter, provide interesting information
about the processor, such as how many I-cache misses
take place, how many instructions are completed, and more. Counter Analyzer
is one plugin of the Visual Performance Analyzer, an Eclipse-based performance
analysis tool. It can analyze raw events, metrics, and CPI breakdown model,
and help you better understand these events.
This article introduces the Performance Monitor Counter and its related tools briefly,
and then shows
you how to use these tools and the Counter Analyzer together, using the Caesar
cipher tool as example.
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Articles |
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03 Feb 2009 |
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Performance tuning considerations in your application server environment
Understand how the various components of a Web application interact, and where you might find performance bottlenecks. Both developers and administrators will benefit from knowing this because performance is everyone's responsibility.
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Articles |
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27 Jan 2009 |
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Initial steps on kdb
kdb is a utility that is primarily intended for performing analysis of a
system dump image. This article describes the initial steps for system dump analysis.
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Articles |
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21 Oct 2008 |
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AIX commands you should not leave home without
Do you wish you could answer some of your own questions when you work with AIX and your System p server? Do you ever feel you could save time by not having to call on the support professionals all the time? Well, wish no more. Shiv Dutta discusses some of the AIX commands that answer those questions and tells you how to enlarge the list of such answers.
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Articles |
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14 Oct 2008 |
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Running Oracle on AIX
A systems administrator always needs to be cognizant of system performance. This article drills down into the many aspects of tuning AIX to run Oracle. We'll look at the Virtual Memory Manager (VMM), CPU, Memory and I/O (disk and network). We'll examine some of the tools that you can use to analyze bottlenecks, while also making some changes to the system. Finally, we'll also review some Oracle tools you can use to help with your performance tuning.
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Articles |
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24 Jun 2008 |
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Shared library memory footprints on AIX 5L
Learn about shared library mechanisms and memory footprints on AIX. This article
is essential for developers writing server code or administrators managing production
AIX systems. It offers developers and administrators commands and techniques, and gives
the understanding necessary to analyze memory requirements of server processes on AIX.
It also helps developers and administrators avoid resource shortages that can't be
identified with other standard runtime analysis tools such as ps or topas. The article is intended for systems administrators or developers of native
applications on AIX.
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Articles |
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06 May 2008 |
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Systems Administration Toolkit: Log file basics
A typical UNIX or Linux machine creates many log files during the course of its
operation. Some of these contain useful information; others can be used to help you
with capacity and resource planning. This article looks at the fundamental information recorded within the different log files, their location, and how that information can be used to your benefit to work out what is going on within your system.
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Articles |
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26 Feb 2008 |
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Building your own memory manager for C/C++ projects
Performance optimization of code is serious business. It's fairly common to see a
piece of functionally correct software written in C or C++ that takes way
too much memory, time, or, in the worst case, both. As a developer, one of the most
powerful tools that C/C++ arms you with to improve processing time and prevent
memory corruption is the control over how memory is allocated or deallocated in your
code. This tutorial demystifies memory management concepts by telling you how to
create your very own memory manager for specific situations.
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Tutorials |
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19 Feb 2008 |
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Optimizing AIX 6.1 performance tuning
Just when you thought you understood performance tuning on AIX(R) Version
5.3, here comes AIX 6.1 on its heels to throw you a curveball. In this article, get
up-to-date information on the recent changes to performance monitoring and tuning in
AIX 6.1, including CPU, virtual memory, and I/O (disk and network). Many of the changes are really less about kernel innovations and
more about ancillary changes, such as improving default parameters to more
accurately reflect real-world data processing. Other enhancements include unique
tunable documentation, restricted tunables, and various other improvements to
certain subsystems. You'll learn more about a performance tuning methodology, which
needs to be a part of any tuning strategy.
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Articles |
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05 Feb 2008 |
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Optimizing AIX 5L performance: Tuning network performance, Part 3
This three-part series on AIX (R) networking focuses on the challenges of
optimizing network performance. Part 1
provided a networking overview and also
discussed the tools you need to monitor your hardware, including netstat, netpmon,
entstat, and nmon. Part 2 discussed monitoring and tuning NFS subsystems. This final
part, Part 3, shows you how to monitor network packets. The series also offers best
practices for network I/O performance tuning.
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Articles |
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29 Jan 2008 |
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Optimizing AIX 5L performance: Tuning network performance, Part 2
This three-part series on AIX (R) networking focuses on the challenges of
optimizing network performance. Part 1provided a networking overview and also
discussed the tools you need to monitor your hardware, including netstat, netpmon,
entstat, and nmon. Part 2 focuses on tuning NFS. You'll learn about monitoring
utilities such as nfsstat and nmon, and you'll also tune with nfso. The series also
offers best practices for network I/O performance tuning.
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Articles |
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22 Jan 2008 |
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DB2 and System p virtualization
Learn best practices for deploying IBM DB2 9 with the IBM System p virtualization technologies.
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Articles |
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10 Jan 2008 |
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Systems Administration Toolkit: Monitoring mail usage
Examine methods for reporting on e-mail usage and getting detailed
statistics on mailbox use. E-mail logs can provide a wealth of information about
your users and their e-mail habits, including how often and frequently they use
their e-mail. Depending on your UNIX(R) systems, you might even be able to glean
more detailed information, such as identifying which users are using their folders
effectively and who could benefit from further training and advice.
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Articles |
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18 Dec 2007 |
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Optimizing AIX 5L performance: Tuning network performance, Part 1
This three-part series on AIX(R) networking focuses on the challenges of
optimizing network performance. In the first installment, you’ll review some best
practices for network configuration, and utilize those practices for efficient
monitoring of your hardware by taking advantage of network tools such as netstat,
netpmon, entstat, and nmon. You’ll also examine certain tools used to look at your
interfaces to see how to configure them.
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Articles |
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20 Nov 2007 |
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Maximizing Java performance on AIX: Part 2: The need for speed
This 5-part series provides several tips and techniques that are commonly used for tuning Java(TM) applications for optimum performance on AIX(R). A discussion of the applicability of each tip is also provided. Using these tips, you should be able to quickly optimize the Java environment to suit your application's needs.
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Articles |
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03 Nov 2007 |
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High-performance network programming, Part 2: Speed up processing at both the client and server
This article provides more techniques for UNIX(R)-based programmers who want
to enhance their network throughput. Learn how to speed up processing at both the
client and server using mmap, gathering scattered I/O, and other methods.
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Articles |
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16 Oct 2007 |
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High-performance network programming, Part 1: Squeeze maximum usage out of your network resources
If you have UNIX(R)-based programming experience, then you've probably
worried at some point about enhancing your network throughput. In this article,
learn some useful techniques to squeeze the most out of your bandwidth, and get a
big performance boost with some of the methods described here.
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Articles |
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02 Oct 2007 |
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Top ten AIX and UNIX articles and tutorials—July 2007
See what AIX(R) and UNIX(R) content your peers found most valuable.
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15 Jul 2007 |
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Optimizing AIX 5L performance: Tuning disk performance, Part 1
Learn more about direct I/O, concurrent I/O, asynchronous I/O, and best
practices for each method of I/O implementation. This three-part series on the
AIX(R) disk and I/O subsystem focuses on the challenges of optimizing disk I/O
performance. While disk tuning is arguably less exciting than CPU or memory tuning,
it is a crucial component in optimizing server performance. In fact, partly because
disk I/O is your weakest subsystem link, you can do more to improve disk I/O
performance than on any other subsystem.
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Articles |
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10 Jul 2007 |
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Top ten AIX and UNIX articles and tutorials—June 2007
See what AIX(R) and UNIX(R) content your peers found most valuable.
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10 Jul 2007 |
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Top ten AIX and UNIX articles and tutorials—April 2007
See what AIX(R) and UNIX(R) content your peers found most valuable.
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20 Jun 2007 |
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Optimizing AIX 5L performance: Tuning your memory settings, Part 3
Get an introduction to swap (paging) space, learn how to configure and
administer it, capture statistics, and tune your Virtual Memory Manager (VMM)
settings to provide for optimum swap (paging) space configuration and performance.
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Articles |
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19 Jun 2007 |
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Optimizing AIX 5L performance: Tuning your memory settings, Part 2
Use ps, sar, svmon, and vmstat to monitor memory usage and analyze the
results. This three-part series focuses on the various aspects of memory management
and tuning on IBM System p(TM) servers running AIX(R). Part 1 provided an overview
of memory on AIX, including a discussion of virtual memory and the Virtual Memory
Manager (VMM). It also drilled down into the tuning parameters and outlined recent
improvements in AIX Version 5.3 with respect to memory management. Part 2 focuses on
the detail of actual memory subsystem monitoring and discusses how to analyze the
results. Part 3 deals specifically on swap space and how best to tune your VMM
settings to provide for optimum swap space configuration and performance. Throughout
this series, I'll also cover some of the best practices of memory performance tuning
and monitoring.
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Articles |
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14 Jun 2007 |
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Optimizing AIX 5L performance: Monitoring your CPU, Part 3
Part 3 of this series focuses on arguably the least understood area of
Central Processing Unit (CPU) performance tuning: controlling thread usage and CPU
binding. This article addresses key tools and utilities you can use to analyze
threads and administrate your processes.
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Articles |
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15 May 2007 |
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Improve your memory programming
Are you tired of spending countless hours devoted to fixing memory faults? Do you
find yourself constantly being bogged down in programs that leak memory, violate memory
bounds, use uninitialized data, and devote an excessive amount of run time to memory
management? Use this article to help you conquer these pesky memory defects.
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Articles |
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04 May 2007 |
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Top ten AIX and UNIX articles and tutorials -- March 2007
See what AIX(R) and UNIX(R) content your peers found most valuable.
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26 Apr 2007 |
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Optimizing AIX 5L performance: Monitoring your CPU, Part 2
Identify which AIX(R) tools to use to monitor your Central Processing Unit
(CPU) for a given situation and find out why some tools might be better than others.
Part 1 of this series discussed the tuning methodology and the importance of having
procedures for CPU performance tuning. It also briefly introduced some performance
tools to use as a part of your tuning repertories, gave an overview of the POWER
CPU, and discussed how the architectural improvements of the evolution of the POWER
Chip have contributed to the hardware improvements of the System p(TM) product line.
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Articles |
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24 Apr 2007 |
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Top ten AIX and UNIX articles and tutorials -- January 2007
See what AIX(R) and UNIX(R) content your peers find interesting.
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14 Mar 2007 |
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Partition Load Manager logging and monitoring
Accomplish server resource virtualization with the help of the Partition Load Manager. Because the Partition Load Manager reallocates resources dynamically across partitions based on their workload, conventional tools for monitoring and analyzing resources become useless. So, what’s a developer to do? You can use the On-demand Monitoring System (OMS) tool for the Partition Load Manager. It works as an integral component providing real-time and historical utilization and allocation data.
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Articles |
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23 Feb 2007 |
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DB2 9 XML performance characteristics
Learn about the performance and scalability characteristics of a simulated securities brokerage transaction processing environment using DB2 9 XML, IBM POWER5+, AIX 5.3, and TotalStorage DS8100. This scenario includes use of the FIXML schema, a financial industry standard.
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Articles |
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30 Jan 2007 |
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Take logical partitioning in the p5 environment to the next level
Learn how to configure a p5 server to provide redundancy and recoverability in a production environment. In a previous article, you examined the basics of how to set up logical partitioning on a p5 server. This included the creation of one Virtual I/O Server (VIO Server) and one logical partition (LPAR), which used the VIO Server for its rootvg and Ethernet connection.
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Articles |
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09 Jan 2007 |
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Logical partitioning in the System p5 environment
Learn the basics of how to partition an IBM System p5 server. If your shop is similar to ours, then maybe you're frustrated with having scores of underutilized servers consuming valuable floor space in your data center -- servers that are dedicated to only one application using only a small fraction of the expensive CPU and memory resources. Wouldn't it be nice to consolidate all of those servers onto just a few pieces of hardware to more fully utilize your resources and yet still maintain separate OS environments for each of the applications? With the IBM POWER5-based servers, you can do just that.
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Articles |
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11 Oct 2006 |
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Quantify performance changes using application tracing
Use the Apache Web server as an example to see how to analyze common configurations for their performance implications. Application tracing watches the system calls made by an application as it runs. By counting the calls and the time they take, you can readily see the impact of performance changes.
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Articles |
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25 Jul 2006 |
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IBM DB2 Enterprise 9 performance with POWER5+ and AIX 5L multipage support
Learn how IBM DB2 9 automatically exploits the 64-kilobyte page support in AIX 5L to deliver high performance for database applications on this platform. This article talks about the DB2 9 for Linux, UNIX, and Windows exploitation of multiple page sizes, and shares some performance results as measured on IBM POWER5+ processor-based systems running IBM AIX 5L.
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Articles |
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08 Jun 2006 |
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nmon analyser -- A free tool to produce AIX performance reports
Searching for an easy way to create high-quality graphs that you can print, publish to the Web, or cut and paste into performance reports? Look no further. The nmon_analyser tool takes files produced by the NMON performance tool, turns them into Microsoft Excel spreadsheets, and automatically produces these graphs.
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Articles |
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19 Apr 2006 |
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Expose Web performance problems with the RRDtool
Examine how to determine the root cause of Web performance problems. Without proper measurement, how do you know whether your Web application is performing well? By using open source tools such as the RRDtool, you can graph the key performance measurements of any Web application, use these graphs to determine the impact of changes in the environment, or point to changes that need addressing.
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Tutorials |
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21 Mar 2006 |
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IBM NFS/DFS Authentication Gateway: Commands and APIs to bridge to NFS Version 4
Learn how to use the IBM NFS/DFS Authentication Gateway commands and application programming interface (APIs) to design applications during migration. As the storage needs of large enterprises continue to grow and NFS implementations offering more and more features, it makes business sense for enterprises to migrate to NFS Version 4, as outlined in the "IBM NFS/DFS Authentication Gateway: A migration bridge to NFS Version 4" companion article.
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Articles |
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28 Feb 2006 |
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nmon performance: A free tool to analyze AIX and Linux performance
This free tool gives you a huge amount of information all on one screen. Even though IBM doesn't officially support the tool and you must use it at your own risk, you can get a wealth of performance statistics. Why use five or six tools when one free tool can give you everything you need?
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Articles |
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27 Feb 2006 |
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CPU monitoring and tuning
Learn how standard AIX(R) tools can help you determine CPU bottlenecks. IBM performance experts show you how to interpret the reports generated by these tools for CPU utilization, thread priority, and scheduling to improve performance. They also provide two case studies to give you real-world examples.
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Articles |
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28 Jul 2005 |
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Deploying IBM DB2 Content Manager OnDemand in a HACMP environment
This article describes the steps needed to configure OnDemand in a two-node HACMP environment.
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Articles |
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15 Jul 2004 |
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Maximizing Java Performance on AIX: Part 5: References and Conclusion
This is the conclusion of the 5-part series providing tips and techniques that are commonly used for tuning Java(TM) applications for optimum performance on AIX(R). We touch upon other interesting areas of Java performance tuning for AIX, look at a few case studies, and then end the series with a list of useful references.
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Articles |
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17 May 2004 |
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Maximizing Java Performance on AIX: Part 4: What goes in
This 5-part series provides several tips and techniques that are commonly used for tuning Java(TM) applications for optimum performance on AIX(R). This article deals with situations where I/O or networks may become bottlenecks.
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Articles |
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03 May 2004 |
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Troubleshooting Java on AIX: Data collection for debugging hangs, high CPU, and performance issues
This article gives instructions for troubleshooting Java(TM) for the IBM(R) AIX(R) operating system. It provides short, simple, and complete instructions for collecting data for debugging hangs, slow responsiveness, or looping situations with Java applications running on AIX. By following the instructions in the article, you'll be able to collect the right data and complete the required steps before contacing IBM Support, thereby expediting your call. This article does not provide information for the analysis of any of the data collected, nor does it provide operating system or application recommendations for resolving issues. This article is provided by the IBM eServer(TM) UNIX and ISV Technical Support Team for AIX and Java in Austin, Texas.
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Articles |
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29 Apr 2004 |
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Troubleshooting Java on AIX: Collecting data for memory issues
This article gives instructions for troubleshooting Java(TM) for AIX(R). It provides short, simple, and complete instructions for collecting information for analyzing memory-related issues associated with Java applications running on AIX. By following the instructions in this article, you'll be able to complete the required steps before contacting IBM(R) Support for help, thereby expediting your call. The article does not give information about the analysis of any of the data collected, nor does it provide operating system or application recommendations for resolving issues. This article is provided by the IBM eServer(TM) UNIX and ISV Technical Support Team for AIX and Java in Austin, Texas.
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Articles |
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28 Apr 2004 |
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Maximizing Java performance on AIX: Part 3: More is better
This 5-part series provides several tips and techniques that are commonly used for tuning Java(TM) applications for optimum performance on AIX(R). A discussion of the applicability of each tip is also provided. Using these tips, you should be able to quickly optimize the Java environment to suit your application's needs.
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Articles |
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10 Apr 2004 |
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Maximizing Java performance on AIX: Part 1: The basics
This 5-part series provides several tips and techniques that are commonly used for tuning Java(TM) applications for optimum performance on AIX(R). A discussion of the applicability of each tip is also provided. Using these tips, you should be able to quickly optimize the Java environment to suit your application's needs.
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Articles |
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29 Mar 2004 |
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AIX 5.2 performance tools update, Part 3
This is the third in our series on AIX 5.2 performance tools updates. This article discusses the new AIX 5.2 tprof command and the Cpu Utilization Reporting Tool (CURT). tprof samples CPU utilization and accounts for time in threads and program modules using the system clock interrupts, which occur at every 100th of a second. CURT reads an AIX trace sequentially and processs the trace hooks, doing bookkeeping along the way to produce a CPU utilization report.
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Articles |
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20 Jan 2004 |
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DB2 and AIX tuning essentials for DB2 performance
Are you running DB2 on AIX? Ever wondered what you can you do within AIX to produce noticeable DB2 performance improvements? This article addresses that question, and also discusses the most important combination of DB2 and AIX tuning parameters for optimum DB2 performance. The author shows you how to implement and design your database with performance in mind, depending on your workload and data requirements. He introduces the best database layout from an operating system perspective, and the best performance settings for both the operating system and the relational database environments.
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Articles |
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18 Dec 2003 |
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AIX 5.2 performance tools update, Part 2
This is the second article in a series about new and enhanced AIX(R) 5.2 performance tools. This article discusses how the tools further empower AIX developers in debugging system and application performance behavior. The vastly improved system tuning utilities in AIX 5.2 help developers and administrators analyze, capture, and identify application and system performance behavior and problems.
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Articles |
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20 Nov 2003 |
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Performance and tuning tips for AIX 5.1-03 (64-bit kernel) on a 16-way p670
This article describes how to analyze and tune AIX system performance. The author uses a benchmark case where I/O was the main focus. The exercise followed the classic AIX performance analysis methodology by eliminating all system bottlenecks, and achieved the goal of saturating a 16-way p670. The results of the exercise improved the application throughput by about 40%.
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Articles |
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20 Nov 2003 |
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AIX 5L improvements in volume management performance
AIX's volume management has evolved dramatically with AIX 5L. Many common operations have been optimized, resulting in significant performance improvements. While volume management is not often considered a performance critical task, configuration of large servers will be more efficient because of ongoing optimizations in AIX 5L. This article describes the performance improvements in volume management in recent AIX releases.
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Articles |
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25 Sep 2003 |
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Using Network File System in AIX -- a primer
In this article we discuss Network File System (NFS), a popular system used by system administrators to distribute filesystems over different nodes in a network environment. NFS is available in all Unix implementations including all releases of AIX. We discuss the components that make up NFS and show how it is generally implemented, with special emphasis on AIX. This article will be of interest to AIX system administrators as well as AIX programmers who work with more than one system in a networked environment.
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Articles |
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17 Sep 2003 |
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AIX 5.2 performance tools update, part 1
With the release AIX 5L Version 5.2, there was a major revamp of the performance tools. Some of the performance tuning commands were replaced, there were new commands added and all of the tuning commands how use the same command syntax and provide consistent behavior.
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Articles |
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17 Sep 2003 |
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How to energize your scripts with the new KornShell
AIX 5L includes ksh93, the latest major revision of the KornShell language, which has a number of significant enhancements over its previous major release, the 1988 version. The new version provides an alternative to Tcl and Perl and compares favorably in speed and functionality. Find out how you can take advantage of ksh93.
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Articles |
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17 Sep 2003 |
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Use Direct I/O to improve performance of your AIX applications
An alternative I/O technique called Direct I/O can give your AIX applications improved performance. This article discusses the benefits of Direct I/O and tells how to implement it.
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Articles |
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07 Nov 2002 |
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