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Preview: IBM developerWorks : AIX and Unix : Articles

IBM developerWorks : AIX and UNIX : Articles



The latest content from IBM developerWorks



Published: 28 Sep 2016 17:44:51 +0000

Copyright: Copyright 2004 IBM Corporation.
 



Hitachi TrueCopy mirroring with IBM PowerHA SystemMirror

23 Sep 2016 04:00:00 +0000

This article explains the steps to configure Hitachi Storage system mirroring and IBM® PowerHA® SystemMirror® to monitor and manage Hitachi disks. In case of a disaster scenario such as fire, earthquake, and so on, the configured PowerHA SystemMirror resource can be moved from the disaster location to some other backup location thereby minimizing the loss of data and business application's downtime.



Machine Learning, Deep Learning 101

20 Jul 2016 04:00:00 +0000

This article describes the growing relevance of Machine Learning used in various kinds of analytics along with an overview of Deep Learning. It provides an end-to-end process for using Machine Learning and Deep Learning and the options for getting started on IBM® Power Systems™.



Gaining better control in directing Live Partition Mobility (LPM) resource consumption

30 Jun 2016 04:00:00 +0000

LPM is being increasingly used by system administrators in order to reduce operational downtime. For running Live Partition Mobility (LPM) with operational efficiency, we should consider the network that is going to route the traffic as well as the CPU cost on the mover service partition (MSP). The objective of this article is to demonstrate careful selection of resources during LPM operation, so that an administrator can enjoy better control over LPM traffic. This also brings in optimal performance and isolation of heavy LPM traffic from other workloads.



Get started with IBM Power Virtualization Center (PowerVC)

09 Mar 2016 05:00:00 +0000

Virtualization plays a key role in cloud computing. IBM Power Virtualization Center (PowerVC) is a new virtualization management tool that's built on OpenStack and designed to simplify the management of virtual resources in Power Systems environments, and thus improve administrator productivity. In this tutorial, we'll cover fundamental concepts, installation, and basic configuration techniques, as well as ways to configure various resources like hosts, storage, and networks. We'll also take a look at virtual machines and images, and show you how to create and manage a VM using PowerVC with the help of screens.



Automatic Repository Disk Replacement (ARR) in an IBM PowerHA cluster

02 Mar 2016 05:00:00 +0000

This article explains the Automatic Repository Disk Replacement (ARR) feature of IBM® PowerHA® SystemMirror®. This article can help customers to configure backup repositories for automatic repository update. The PowerHA SystemMirror ARR feature helps to prevent a cluster from moving to the restricted mode in case a cluster repository disk is inaccessible or failed, ensuring that the cluster always remains in the stable state.



IBM Cognos integration with Sterling Selling and Fulfillment Suite on Linux

14 Jan 2016 05:00:00 +0000

This article reviews the necessary steps to integrate IBM Cognos 10 and IBM Sterling Selling and Fulfilment Suite 9 on Linux. Before you begin, it is recommended that you have an understanding of both IBM Cognos and Sterling Selling and Fulfillment Suite.



Configuration and integration of IBM System Storage SVC PPRC with IBM PowerHA using CLI

22 Dec 2015 05:00:00 +0000

This article provides detailed steps for the configuration of IBM® System Storage® SAN Volume Controller (SVC) with Peer-to-Peer Remote Copy (PPRC) and integrating it with IBM PowerHA®. It briefs about the SVC configuration with IBM PowerHA to provide PPRC technology for faster failover of data. SVC is block storage which does virtualization using Fiber Channel storage area network (SAN).



Installing and using IBM PowerVP and IBM AIX

18 Aug 2015 04:00:00 +0000

This article describes how to install and use IBM PowerVP on an IBM AIX environment to monitor your IBM POWER8 and IBM POWER7 processor-based systems. You can also learn how to download, install, and configure PowerVP on AIX. New features in the latest version of PowerVP are also introduced and discussed in this article.



Recovering from a resource failure in IBM PowerHA cluster

30 Jul 2015 04:00:00 +0000

This article explains about recovering from a resource failure caused due to wrong input to resources in IBM® PowerHA® cluster. There are scenarios in which a cluster might go to the unstable state and a resource might go to the error state due to wrong input to resources such as applications, file systems, and so on. This article helps to understand how to get cluster to a stable state after rectifying the wrong input to resources and make it accessible using the IBM PowerHA SystemMirror cluster recovery script failure tool.



Integration of Microsoft Windows Active Directory server as a pass-through authentication server to IBM Tivoli Directory Server

10 Jul 2015 04:00:00 +0000

This article explains about configuring Microsoft Windowsas a pass-through authentication server for IBM Tivoli Director Server Lightweight Directory Access Protocol (LDAP) server. The IBM AIX clients are mapped to the AIX LDAP server and the Windows clients are mapped to the Windows Active Directory (AD) server. But, when the user logs in to the AIX client, the user credentials get validated at the Windows AD server for getting login access to the AIX clients. This article provides the configuration steps in detail.



Explore the OpenStack REST APIs for PowerVC

16 Apr 2015 04:00:00 +0000

IBM Power Virtualization Center Express Edition (PowerVC) is an IaaS cloud solution designed to make it easier to build and manage virtual resources in a Power Systems Software Defined Environment or a cloud infrastructure. It is primarily based on OpenStack and includes OpenStack industry-standard application programming interfaces. Learn about the APIs for each OpenStack component and the tasks the APIs can help you complete.



Understanding storage framework disk fencing in IBM PowerHA SystemMirror 7.1

22 Jan 2015 05:00:00 +0000

This article introduces a new feature of IBM® PowerHA® SystemMirror® 7.1, the storage framework disk fencing, which can shut off disk write access from IBM AIX® Small Computer System Interface (SCSI) disk driver layer, and help to prevent data corruption of inadvertent disk access.



Using Storix

16 Jan 2015 05:00:00 +0000

Recovering or building new machines running AIX is a straightforward process when you use Storix.



varyonvg and varyoffvg scripts

06 Jan 2015 05:00:00 +0000

This article covers two scripts that can vary on and vary off one or more volume groups (VGs). It also covers troubleshooting problems when unmount, varyonvg and varyoffvg commands fail.



Moving IP address from one Ethernet to another

24 Dec 2014 05:00:00 +0000

There will be times when you have to move an Ethernet IP address to another Ethernet. The first Ethernet may have gone bad and you have to move its IP address to another or may be you are moving from 1 GB Ethernet to a new 10 GB Ethernet. Whatever the reason is, this article provides you the steps to move the IP address from one Ethernet to another. My intention in this article is to make you aware that not only do you have to move the IP address to the new Ethernet but you also have to move all the routes as well. If the routes are missing on the new Ethernet you could run into problems and you may not know what the routes used to be so you can add them. I will show you how to create all the routes on the new Ethernet.



IBM XIV mirroring with IBM PowerHA SystemMirror using XCLI commands

02 Dec 2014 05:00:00 +0000

This article explains the steps to configure IBM® XIV® Storage System mirroring and IBM PowerHA® SystemMirror® to monitor and manage the XIV disks using XCLI commands. In case of a disaster scenario such as fire, earthquake, and so on, the configured XIV resources can be moved from the disaster location to some other backup location thereby minimizing the loss of data and business application's downtime.



IBM GPFS cluster installation and configuration in IBM AIX

25 Nov 2014 05:00:00 +0000

This article is intended for IBM® AIX® system administrators, file system developers and testers for installing and configuring the IBM General Parallel File System (IBM GPFS™) high availability cluster node for environments such as AIX clusters, Linux® clusters, Microsoft® Windows® Server, or heterogeneous cluster for AIX, Linux, and Windows nodes.



IBM XL compiler hardware transactional memory built-in functions for IBM AIX on IBM POWER8 processor-based systems

18 Nov 2014 05:00:00 +0000

Transactional memory is a hot topic in parallel programming and many software implementations have been developed, but solutions based on hardware transactional memory have superior performance. IBM is leading the way with its implementations of transactional memory on its hardware platform, first on IBM Blue Gene and IBM z/OS, then recently with IBM AIX support of hardware transactional memory on the POWER8 platform. This article introduces the IBM XL compiler hardware transactional memory built-in functions, including its installation and configuration with examples using XL C++ and XL Fortran.



Updating Virtual I/O Server (VIOS) to a higher level using an alternate disk

13 Nov 2014 05:00:00 +0000

This article describes how to update Virtual I/O Server (VIOS) to a higher level using an alternate disk. This is an intermediate-level article and is targeted for system administrators. This overview of VIOS update process can prepare system administrators for what needs to be done and what to expect so that the update can be as quick and as easy as possible.



Controlling symbol visibility for shared libraries: Part 2 - Advanced knowledge with IBM XL C/C++ V13 compiler

09 Sep 2014 04:00:00 +0000

This is the second article of our two-part series about symbol visibility. This article demonstrates more methods on visibility setting and resolution using the IBM® XL C/C++ V13 compiler. The article also introduces and explains some of the linking, assembly, and tooling facilities.



Exploring IKEv2 with ECDSA certificate in IBM AIX

23 Jul 2014 04:00:00 +0000

Internet security is a major concern now-a-days. Internet Protocol Security (IPSec) is a security protocol suite which works on the L3 layer of network and provides a strong security with the help of different types of authentication and encryption mechanisms. This article discusses about the usage of the Elliptic Curve Digital Signature Algorithm (ECDSA) certificate based authentication mechanism for Internet Key Exchange Version 2 (IKEv2).



IBM AIX SAN Volume Controller update and migration

19 Jun 2014 04:00:00 +0000

This article discusses the tasks to be performed for IBM® AIX® when updating or migrating IBM System Storage® SAN Volume Controller (SVC) to a new release. It includes a script that makes it easier to prepare many AIX servers for update or migration.



Getting bosboot errors, don’t reboot just yet

12 May 2014 04:00:00 +0000

You are about to reboot your system for some planned maintenance, perhaps through some upgrade or migration. For this process to complete, you issue a : bosboot - a command. It may be the case that the bosboot command fails, the output informing you "it is not safe to reboot your system". Though initially, this might come across as a real and present problem (which it is), there are tasks to perform that can prove that the system is indeed rebootable with the current image. This article summarizes the tasks that can be performed to verify if it is save to reboot.



Getting started with SSH security and configuration

09 May 2014 04:00:00 +0000

Are you a new UNIX(R) administrator who needs to be able to run communication over a network in the most secure fashion possible? Brush up on the basics, learn the intricate details of SSH, and delve into the advanced capabilities of SSH to automate securely your daily system maintenance, remote system management, and use within advanced scripts to manage multiple hosts.



Map VIOS LUNs with minimal requirement

02 May 2014 04:00:00 +0000

This article maps the logical unit numbers (LUNs) between the client and the server. The only requirement it has is to run as root and be able to use Secure Shell (SSH) to connect an IBM® AIX® jump server to the VIOS client and server without entering the password. It provides a lot of information including the Virtual I/O Server (VIOS) that is providing the Shared Ethernet Adapter (SEA), the virtual Small Computer System Interface (VSCSI), and the command to re-create the virtual target device as well.



Enforcing environmental limits

11 Apr 2014 04:00:00 +0000

Controlling user limits should not only cover the resources being used, it should also encompass environmental limitations on the account in general. This article describes what user limits should cover and also demonstrates the concepts of limits with examples.



Automatic discovery and HyperSwap configuration tool for IBM Power HA SystemMirror for AIX

11 Apr 2014 04:00:00 +0000

The IBM® HyperSwap® feature in IBM PowerHA® SystemMirror® provides continuous storage availability in a multisite PowerHA cluster. It gives the advantage of planned and unplanned maintenance and migration of storage. To achieve HyperSwap configuration across sites, administrators need to configure Peer-to-Peer Remote Copy (PPRC) Metro Mirror between pairs and need to enable the HyperSwap feature for each of the disks. This involves collecting the logical unit number (LUN) and logical subsystem (LSS) information of the shared disks from the cluster nodes, and this is a time-consuming process. This article describes the scripts that can perform the HyperSwap configuration automatically.



IBM AIX commands you should not leave home without

04 Apr 2014 04:00:00 +0000

Do you ever wish you could answer some of your own questions when you work with IBM AIX® and your IBM Power Systems™ 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.



Secure LPM: Live Partition Mobility with IPSec

27 Mar 2014 04:00:00 +0000

In plain Live Partition Mobility (LPM), transfer of memory contents of the source logical partition (LPAR) goes unprotected over the network. Secure LPM provides an option to administrators to choose whether or not to transfer memory contents through an Internet Protocol Security (IPSec) tunnel. This article explains the steps to configure secure LPM and provides an overview of the available security profiles that mandate the creation of automatic tunnels. It also covers the concepts, prerequisites, and hardware and software configuration along with screen captures.



Getting started with Nmap for system administrators

24 Mar 2014 04:00:00 +0000

Nmap is an open source port scanner for Linux® and many other platforms that can boost your system's security. This article discusses the basics of Nmap for system administrators and how to get started using it.



Create nmon web pages in an enterprise environment using nmon2rrd

20 Mar 2014 04:00:00 +0000

With nmon, you can capture performance data into a CSV file. This can then be converted into a graphic form using many tools that are available. One such rather good tool is nmon2rrd, which by using rrdtool will convert the time series data into a meaningful graphic HTML page.



Continuous integration setup for IBM System Planning Tool

07 Mar 2014 05:00:00 +0000

This article describes the detailed steps to configure your own continuous integration build set up for the IBM® System Planning Tool (SPT) without making use of any other publicly available continuous integration tools. This setup comes with the scheduled code extraction and build, scheduled test suite execution, and scheduled code coverage report generation features. You can use this article as a reference while setting up your own continuous integration environment for any of your projects as it gives step-by-step configuration details. This greatly reduces your research, exploration, and development time of the project setup.



How to read detailed data of error-log entries

11 Feb 2014 05:00:00 +0000

This article aims at explaining the method of reading detailed data of error-log entries using C programs. As you read, you will be introduced to various functions, structures, and constructs to be used for this and an example code to end the article.



IBM AIX MPIO: Best practices and considerations

20 Jan 2014 05:00:00 +0000

This article can help you to learn the best practice configuration details and considerations to optimize your IBM® AIX® Multi Path I/O (MPIO) solutions, and also to easily determine the MPIO options that are most suitable for your applications and business needs.



IBM Entrepreneur Week

15 Jan 2014 05:00:00 +0000

IBM Entrepreneur Week is a one-of-a-kind opportunity for you to meet, interact, and connect with entrepreneurs, venture capitalists, industry leaders, and academics from around the world. If you're a startup or entrepreneur, join us onlne for our inaugural IBM Entrepreneur Week, 3-7 Feb 2014. There will be events taking place online and in locations worldwide, including face-to-face and virtual mentoring sessions, a women entrepreneur-focused event, and a LiveStream broadcast of the SmartCamp Global Finals in San Francisco.



String externalization practices and considerations for UNIX shell scripts

24 Dec 2013 05:00:00 +0000

In this article, we provide practical "How-Tos" and experiences on externalizing shell script messages in a product. Also, we provide suggestions on what to consider before and during translation enablement from a globalization perspective. The target audience is product developers who would like to enable their shell scripts for translation. After reading this article, readers can understand the considerations for externalizing shell script messages, realize the end-to-end process of string extraction and translation, and be aware of some known issues and their solutions.



IBM AIX audit on an LDAP server

09 Dec 2013 05:00:00 +0000




IBM PureFlex System virtualization configuration for optimal functional capability

19 Nov 2013 05:00:00 +0000

This tutorial covers the common configurations that are necessary to get optimal results and usage from the IBM® PureFlex™ System environment, using IBM Flex System Manager™ capabilities. There are prerequirements for every Flex System Manager operation, which might be missed or performed incorrectly. Also, there can be multiple resources to be configured in the virtualization environment, and therefore, the order of configuration also plays a big role.



Extending snap data collection

11 Nov 2013 05:00:00 +0000

This article aims at equipping users with the knowledge of extending the snap utility to collect debug data for third-party components installed on a system. Some background understanding of snap such as architectural overview, various components, and so on are also covered as a part of this article. We conclude the article with a full-fledged example.



Tracing IBM AIX hdisks back to IBM System Storage SAN Volume Controller (SVC) volumes

01 Nov 2013 04:00:00 +0000

When working in an IBM AIX® environment that uses the IBM System Storage® SAN Volume Controller (SVC), you need to be able to determine the SVC volumes that represent each AIX hdisk. This article covers the procedure to perform this manually as well as automate the process by using a script. With these skills, you will be able to better manage the storage on your SVC and AIX systems.



IBM PowerHA SystemMirror rapid deploy cluster worksheets for IBM AIX

23 Oct 2013 04:00:00 +0000

This tutorial outlines the high-level requirements to plan out a cluster configuration with a checklist approach and then proceeds with the deployment instructions through the new cluster command-line interface (CLI). The steps outlined are for illustration purposes and can be easily modified to deploy more-complex configurations. Note that beyond these instructions, there are alternative paths using the smitty sysmirror and IBM Systems Director interface, which are well documented in IBM® Redbooks® and online documentation. The CLI examples shown were primarily tested using the 7.1.2 cluster release and show options and flags that might not have been retrofitted in the earlier version 7 releases.



Using the NIM service handler with the NIM Alternate Disk Migration tool

15 Oct 2013 04:00:00 +0000

This article describes how to use nimsh with nimadm to migrate to IBM® AIX® version 7.1.



How to write trace format entries

03 Oct 2013 04:00:00 +0000

This article aims at equipping users with the knowledge required to write effective trace format entries. We will look at elements of the trace format entry, covering each of them with examples and situations where they can be handy. There is an example at the end of the article to give you a sense of how these pieces of a puzzle fit together.



Command-line interaction for IBM i Access Client Solutions

03 Oct 2013 04:00:00 +0000

In this article, you can learn how to invoke Access Client Solutions from the command line and see the utility through functional examples.



System call interception using a standard public IBM AIX interface

26 Sep 2013 04:00:00 +0000

IBM AIX® provides a standard public interface named kmod_util to support system call interception since AIX 6.1 TL06 and AIX 7.1. In this tutorial, we provide step-by-step instructions explaining how kmod_util can be used to intercept system calls under various situations.



Strengthening the SSH configuration used in GPFS installations to make them more secure

19 Sep 2013 04:00:00 +0000

Currently, a prerequisite of any IBM General Parallel File System (IBM GPFS) installation is that all the nodes on the cluster must be able to communicate with each other using the root user ID and that this is done without a password in order to facilitate automated tasks. But this configuration represents a security exposure, because security best practices forbid that the root user can log in remotely. The configuration presented in this article resolves this dilemma by allowing the GPFS cluster nodes to continue communicating with each other using the root ID and at the same time blocking this type of connection to other users and nodes.



Vice partition virtualization for IBM AFS

10 Sep 2013 04:00:00 +0000

IBM® AFS™ storage area network (SAN) storage virtualization provides the mechanism to migrate the existing vice partitions from one file server to another file server without restarting the file server or terminating the client processes. This article explains the problem with the existing IBM AFS file server setup in migrating the vice partitions from one file server to another and the steps to resolve the same using IBM AFS SAN storage virtualization.



IBM PowerHA SystemMirror cluster migration

04 Sep 2013 04:00:00 +0000

IBM® PowerHA® SystemMirror is an application that makes a system fault resilient and reduces downtime of applications or databases. This article helps customers to plan for and successfully accomplish cluster migration.



Decoding location codes

26 Aug 2013 04:00:00 +0000

When you have a faulty device, you need to know where the device is located physically on your system, so it can be replaced. The errpt or lscfg comand provides a location code specifying where the faulty device is located. Armed with the location code and a server manual or an IBM® Redbooks® title covering your model, or even better with access to IBM web information center, you should be able to identify exactly where the device is located.



IBM PowerHA SystemMirror HyperSwap with Metro Mirror

19 Aug 2013 04:00:00 +0000

IBM® HyperSwap® with Metro Mirror is a new feature in IBM PowerHA® SystemMirror 7.1.2 Enterprise Edition. It provides continuous availability against storage errors and prevents unnecessary application fallover to a disaster recovery site, which happens only if the storage fails. This article introduces HyperSwap with PowerHA and provides a detailed explanation of how to plan for and configure the PowerHA Enterprise Edition cluster with HyperSwap and Metro Mirror.



Exploring the DWARF debug format information

12 Aug 2013 04:00:00 +0000

This article helps you understand the DWARF debug file structure and explore the DWARF object files.



Building a two-node IBM GPFS cluster on IBM AIX

01 Aug 2013 04:00:00 +0000

This article is a step-by-step guide for deploying a two-node IBM® General Parallel File System (IBM GPFS™) V3.5 cluster on IBM AIX® 7.1.



IBM AIX autostartup and shutdown scripts

29 Jul 2013 04:00:00 +0000

Automatically starting up the required services when a system restarts can save you the task of logging in to the system to manually start those services. When shutting a system down, you can have scripts in place to shut down those services in a controlled manner. This article covers the different methods employed to start or stop your applications when a system is restarted or shut down.



Simplify and centralize IPSec management on AIX

15 Jul 2013 04:00:00 +0000

Internet Protocol Security (IPSec) helps you secure your data, but implementing IPSec tunnels in a large enterprise with many systems can be a daunting task. In this article, learn to use the centralized IPSec management feature in AIX to manage IPSec configuration for large numbers of client machines. Examples show how to simplify and centralize management of a configuration using LDAP as a central repository.



IBM SAN switch upgrade method

15 Jul 2013 04:00:00 +0000

In storage area network (SAN) environments, we need SAN switches with different hardware and firmware levels. Most of the time, we face requirements for upgrading or downgrading SAN switch firmware. This tutorial explains both the graphical and command-line interface (CLI) methods to perform this task.



IBM AIX and Microsoft Active Directory integration with Kerberos and LDAP

11 Jul 2013 04:00:00 +0000

The KRB5LDAP compound load module in IBM® AIX® allows user information to be pulled from Microsoft® Active Directory (AD) using Lightweight Directory Access Protocol (LDAP) and authentication against AD using Kerberos. This article explains the necessary steps to configure KRB5LDAP.



Enhance distributed development with IBM Rational Developer for AIX and Linux Version 9.0

09 Jul 2013 04:00:00 +0000

IBM Rational Developer for AIX and Linux Version 9.0 allows you to use a single project to develop, build, test, debug, and performance tune your application across multiple systems at the same time. Mike Kucera describes the features that enable distributed development.



Getting more done with less: Using scripts and utilities to run commands across all your IBM AIX servers quickly

08 Jul 2013 04:00:00 +0000

System administrators are increasingly required to manage more servers, decreasing the amount of time they are able to dedicate to each server. Time-saving utilities are crucial in ensuring efficiency in managing these servers. Simple, serially run one-line Secure Shell (SSH) loops and parallel-run commands using utilities, such as dsh and parallel SSH, drastically improve efficiency, especially in large-enterprise environments.



VIOS shared storage pool and thin provisioning

03 Jul 2013 04:00:00 +0000

I wondered why IBM® Power Systems™ does not have the snapshot and thin-provisioning features that can make the life of a system administrator much easier when there is a need to upgrade or maintain efficiency. Finally, I found it in Virtual I/O Server (VIOS) shared storage pool, which I have detailed in this article.



Get your IBM Power Systems environment to a supported level

01 Jul 2013 04:00:00 +0000

Running unsupported software or system firmware in your IBM® Power Systems™ environment can pose a significant exposure to your business. Fortunately, getting your environment to a state where IBM can support it may be easier than you think. This article looks at the components you may need to upgrade. It also points you to further information to help you get started.



A hidden and dangerous side effect of tuning j2_inodeCacheSize and the memory DR operation

24 Jun 2013 04:00:00 +0000

In this article, we reveal a hidden and dangerous side effect of tuning j2_inodeCacheSize and the memory dynamic reconfiguration (DR) operation. This harmful side effect might cause serious consequences including inode cache exhaustion, file system corruption, and system failure. We demonstrate and explain how it occurs and how to prevent it. We also introduce some methods to detect and fix such problems.



Controlling symbol visibility for shared libraries: Part 1 - Introduction to symbol visibility

12 Jun 2013 04:00:00 +0000

This is the first one of our two-part series about symbol visibility. In this part, you may get to know the fundamental concept about symbol and symbol visibility, and ways for a programmer to make symbol visibility under control on IBM® AIX® that runs on the IBM POWER® platform. Further, this article details about symbol preemption to show the subtle difference between exported symbol and symbol that is exported but also protected.



Stack-based breadth-first search tree traversal

04 Jun 2013 04:00:00 +0000

This article explains the traditional breadth-first search (BFS) that has drawbacks in terms of extra space required by the queue data structure. If a tree has multiple children and is a balanced tree, then the queue size would grow exponentially and could cause serious memory threats. The solution in this article provides a parallel approach for printing the tree in BFS fashion, where the queue data structure in not required at all. Instead, stack memory is used but memory consumption would be log(n) with base N, where N is the average children count per node and 'n' is the number of nodes in the tree.



Multi-disk management for IBM Systems Director VMControl: Part 3

28 May 2013 04:00:00 +0000

IBM® Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping reduce IT management complexity and cost. IBM Systems Director VMControl™ is an advanced plug-in installed on top of IBM Systems Director to provide the virtualization capabilities. This tutorial talks about the multi-disk support while deploying workload using the VMControl Representational State Transfer (REST) application programming interfaces (APIs) and command-line interface (CLI).



Considerations in software design for multi-core multiprocessor architectures

20 May 2013 04:00:00 +0000

Today's chip multithreaded, multi-core, multiprocessor systems provide software designers a great opportunity to achieve faster and higher throughput. However, there are a few key design considerations, if ignored, could result in hard-to-find performance issues and scalability bottlenecks.These key design considerations are discussed in this article.



Multi-disk management for IBM Systems Director VMControl: Part 2

14 May 2013 04:00:00 +0000

IBM Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping reduce IT management complexity and cost. VMControl is a advanced plug-in installed on top of IBM Systems Director to provide the virtualization capabilities. This tutorial talks about the multi-disk management and revision control for capturing virtual appliances using the VMControl Representational State Transfer (REST) application programming interfaces (APIs) and command line interface (CLI).



PowerVM configuration and scaling with WebSphere Portal

09 May 2013 04:00:00 +0000

This article describes a series of performance benchmarks that demonstrate the scaling properties of an IBM PowerVM® virtual machine running IBM WebSphere® Portal on the IBM AIX® operating system. Various PowerVM configuration settings are used to demonstrate how performance changes when CPU entitlements and virtual CPUs are changed.



Multi-disk management for IBM Systems Director VMControl: Part 1

06 May 2013 04:00:00 +0000

IBM Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping reduce IT management complexity and cost. IBM Systems Director VMControl™ is an advanced plug-in installed on top of IBM Systems Director to provide virtualization capabilities. This tutorial talks about multi-disk management for virtual server using the VMControl Representational State Transfer (REST) application programming interfaces (APIs) and command-line interface (CLI).



Shared Ethernet Adapter configuration with two networks

02 May 2013 04:00:00 +0000

This tutorial describes how to configure two different networks using Virtual I/O Server (VIOS) with high availability, redundancy, and load sharing. With this architecture, VIOS and logical partitions (LPARs) can be accessed from two completely different networks and both networks can be used for different purposes.



Setting up the IBM AIX server as a router (static routing)

25 Apr 2013 04:00:00 +0000

Routing is the process of moving a packet of data from source to destination. Static routing uses manually added routes whereas dynamic routing uses dynamic routes. This article explains how to set up an IBM® AIX® server as a router to communicate with private and public networks by using static routing.



The troubleshooter's guide for managing storage using IBM Systems Director

22 Apr 2013 04:00:00 +0000

The purpose of this article is to document the troubleshooting methodologies and the best practices to be followed while managing the storage component and also provide the information about what needs to be verified in an entity, such as IBM® Systems Director, LSI, NetApp Eagle provider, and so on to overcome certain issues. In short, this article would serve as a one-stop reference for debugging storage management issues more efficiently.



Troubleshooting process hangs caused by JFS2 inode with an empty extended attribute entry

18 Apr 2013 04:00:00 +0000

In this article, we reveal a special kind of inode that cannot be detected by the fsck command, and explain why it can cause process hangs and drop system performance. We also introduce some approaches to tackle such an issue.



IBM PowerHA SystemMirror cluster migration to IBM POWER7

04 Apr 2013 04:00:00 +0000

This article provides the tips for migrating an IBM® PowerHA® SystemMirror cluster from IBM POWER6® to IBM POWER7® processor-based servers. This step-by-step guide describes how to migrate a high-availability (HA) cluster to POWER7, upgrade the cluster from IBM HACMP™ to PowerHA, and migrate shared cluster volume groups for fast disk takeover.



Using IBM Image Construction and Composition Tool

02 Apr 2013 04:00:00 +0000

This article aims to provide common best practices when working with the IBM® Image Construction and Composition Tool® (ICCT) to design and build virtual appliances on IBM PowerVM® cloud providers.



IBM AIX device driver development

28 Mar 2013 04:00:00 +0000

This tutorial illustrates the IBM® AIX® device driver framework and related application programming interfaces (APIs). Here, we shall discuss about the device switch structure, API to register device switch methods, major and minor number management, and moving data from kernel to user space.



Fine-grain network quality of service on IBM AIX 7.1 and Linux in a multi-tenant cloud environment

21 Mar 2013 04:00:00 +0000

In a multi-tenant environment, typically tenants share a single infrastructure on which resources are logically partitioned and where the cloud administrators support the required provisioning to enable sharing of the infrastructure. In purview of the overall administrative tasks, maintenance of network quality of service (QoS) per tenant is a must have but a tedious task. This article demonstrates a powerful QoS mechanism available with the Linux® operating system that can help cloud administrators to effectively divide the total network bandwidth available on a centralized Linux server, hosting cloud applications among tenant client systems such as IBM® AIX®, Microsoft® Windows®, and Linux.



Simulating dropped TCP/IP packets on IBM AIX

15 Mar 2013 04:00:00 +0000

Commercial software products are often developed and tested on local high-speed, high-capacity networks, where there is little congestion or packet loss. The network conditions in deployment environments may not be so ideal. Heavy congestion or hardware errors on networking equipment might result in lost packets, which can severely affect product performance. This article shows you how to use and customize a provided facility for simulating dropped Transmission Control Protocol/Internet Protocol (TCP/IP) packets on IBM® AIX® to allow you to anticipate how well a product will behave under less-than-ideal network conditions.



Enterprise maintenance strategy for IBM AIX running on IBM Power Systems servers

11 Mar 2013 04:00:00 +0000

Systems maintenance plays an essential role within every enterprise to ensure supportability and system reliability in order to maximize the availability of the services that make up the technical landscape. With multiple components to consider (IBM® AIX®, database, application, and so on), juggling systems maintenance requirements with service level agreements (SLAs) can be challenging, but by aligning a schedule of activities, the frequency of planned outages can be reduced. This article looks at the importance of treating the service as an entity and with it, creating an enterprise maintenance strategy that maximizes system availability.



Automated environment setup tool for IBM Systems Director VMControl

05 Mar 2013 05:00:00 +0000

IBM® Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping to reduce IT management complexity and cost. IBM Systems Director VMControl™ is an advanced plug-in installed on top of IBM Systems Director to provide the virtualization capabilities. This article talks about a tool for automatic environment setup for IBM Systems Directors testing and development. The tool is designed to work for almost all the supported resource features, such as kernel-based virtual machine (KVM), IBM z/VM®, VMware, and IBM Power® Systems™ platforms.



Technical library using IBM AIX RAS infrastructure tracing services

01 Mar 2013 05:00:00 +0000

This article explains how to use IBM AIX reliability, availability, and serviceability (RAS) infrastructure services to enable trace capability for kernel extension and device drivers. Mainly, the AIX infrastructure manages core error logging, component tracing, and dump facilities for kernel extension and device drivers. It provides the interface to register and control the level of tracing facilities for kernel extension and driver components. It also exemplifies the concepts through an example implementation and best practices to be followed to interface with the RAS infrastructure.



Subsystem Device Driver Path Control Module (SDDPCM) for IBM AIX

25 Feb 2013 05:00:00 +0000

Subsystem Device Driver Path Control Module (SDDPCM) is used for implementing multipath configuration environment using IBM System Storage SAN Volume Controller (SVC), IBM Storwize V7000, and other IBM Storage products. It supports a storage-redundant configuration environment for a host system that is attached to storage devices. It provides enhanced data availability, dynamic input/output (I/O) load-balancing across multiple paths, and automatic path failover protection.



SOA integration with IBM CICS from IBM WebSphere Application Server on IBM AIX

19 Feb 2013 05:00:00 +0000

IBM WebSphere and IBM CICS Transaction Gateway (CISCS TG) deployed to run on IBM AIX in local mode with the CICS ECI XA resource adapter, using the Internet Protocol Interconnectivity (IPIC) protocol for communication with CICS Transaction Server for IBM z/OS offers many benefits, especially in the operational management of the integrated environment with deployed Java Enterprise Edition (JEE) applications.



Scripting IBM AIX LPAR builds from A to Z in an IBM PowerVM environment

07 Feb 2013 05:00:00 +0000

In today's high demand and quickly changing IT environment, many system administrators are looking for areas where they can save time and automate tasks. Creating a logical partition (LPAR) creation is a common task that when manually done takes a significant amount of time. In other words, it is a perfect task to automate! This article covers the steps to create a LPAR from the command line and then show how this can be automated with a script.



IBM Systems Director VMControl resource lifecycle management: part 4

04 Feb 2013 05:00:00 +0000

IBM Systems Director is a platform management solution that is used to manage physical and virtual systems in a multisystem environment. It supports various virtualization technologies and multiple operating systems across IBM and non-IBM platforms. IBM Systems Director VMControl is an advanced manager of IBM Systems Director, a free-to-own set of platform management tools. This tutorial is part of a series on VMControl resource lifecycle management. This tutorial explains about server system pool lifecycle using the VMControl Representational State Transfer (REST) application programming interfaces (APIs).



IBM AIX RAS – firmware-assisted and live dump facilities explained

01 Feb 2013 05:00:00 +0000

The article explains advanced IBM® AIX® dump facilities built up to capture system dump robustly. More specifically, it discusses the various aspects of firmware-assisted and live dump facilities. It provides the details of live dump kernel service to reliability, availability, and serviceability (RAS) infrastructure and various options or turntables to be considered to capture the live dump for a component or driver data. It illustrates the live dump facilities with an example kernel extension.



Configure SMI-S providers for storage

28 Jan 2013 05:00:00 +0000

Storage Management Initiative Specification (SMI-S) is an industry standard developed by the Storage Networking Industry Association (SNIA) with which independent management software can manage storage devices (storage and switches) through a standard interface based on the Common Information Model (CIM) protocol.



IBM PowerHA 7.1 heartbeat over SAN

21 Jan 2013 05:00:00 +0000

This article describes the prerequisite configuration required, and the actual configuration to use IBM PowerHA 7.1 storage area network (SAN) heartbeat. In PowerHA 7.1, the disk heartbeat has been replaced by a SAN heartbeat, which should be included in a resilient PowerHA architecture.



Versioned Workload Partitions

14 Jan 2013 05:00:00 +0000

This article explains the requirements for moving to versioned Workload Partitions (versioned WPAR) as well as limitations and restrictions. It also explains the configurations of a versioned WPAR to allow it to run in an IBM AIX global environment.



The NIM cheat sheet

07 Jan 2013 05:00:00 +0000

Have you ever had to install a large number of IBM AIX servers from scratch? Do you need a quick and easy way to create and store operating system backups? Would you like to know how to perform AIX operating system migrations on live servers quickly? Well, here is your complete cheat sheet for setting up and using the Network Installation Manager (NIM) tool in AIX. Learn how to set up the server and client components, perform a basic installation, use NIM to create mksysb backups, and perform alt_disk migrations over the network.



Shuffling disk data around

02 Jan 2013 05:00:00 +0000

Data maintenance on disks is a common task for any system administrator. A quite frequent task in my experience is data movement. This may be due to hotspots on your disk, a quick fix is to move some logical volumes off to another disk to ease congestion. The migratelp command is your trusted friend in this situation. When you are experiencing a failing disk or you are migrating data from one disk to another disk, you can use the migratepv command or create a mirror copy, and you are not restricted to just one method. For original volume groups (VGs), when adding a disk to the VG, you may run into a factoring issue. However, by understanding the characteristics of the VG, the factoring can be changed. These common disk maintenance tasks are discussed with examples in this article.



Sharing physical volumes across logical partitions on IBM Power Systems servers

24 Dec 2012 05:00:00 +0000

This article explains the process of sharing physical volumes (PVs) across multiple logical partitions (LPARs). This kind of environment is required for a cluster setup.



Interactive tool to run REST APIs of IBM Systems Director

19 Dec 2012 05:00:00 +0000

This article covers the interactive tool to run Representational State Transfer (REST) application programming interfaces (APIs) of IBM Systems Director VMControl. This tool provides a command-line interface (CLI) interface to invoke REST APIs for IBM Systems Director VMControl.



POSIX and Olson time zone formats

13 Dec 2012 05:00:00 +0000

This article helps you to understand various time zone formats, interpret the Portable Operating System Interface (POSIX) format, and understand the output of the zdump command with examples.



Improve your productivity by using the debugger in Rational Developer for Power Systems Software

11 Dec 2012 05:00:00 +0000

IBM Rational Developer for Power Systems Software features an integrated source-level debugger that helps you debug applications written in different languages and running on different platforms. The key feature of the debugger is that its user interface client connects remotely to a debugger engine running on a different machine. This article shows you how to use the debugger's core features, its advanced features, and its integration with the rest of Rational Developer for Power Systems and other IBM technology.



What is that file?

06 Dec 2012 05:00:00 +0000

There are many commands you can use on the IBM AIX operating system to get information about files. The ls -l command gives you some basics, such as the file name, its size, permissions, and the time the file was last modified. But you can find a lot more interesting and helpful information about files. This article shows you some of the commands that can give you the inside scoop about files, including what the files contain, what processes use them, when they were last accessed, and much more.



IBM SmartCloud Entry for IBM Power Systems

06 Dec 2012 05:00:00 +0000

IBM SmartCloud Entry for IBM Power Systems is an entry-level private cloud offering from IBM for IBM POWER® processor-based systems. When the required software stack is installed and configured, the ability to deploy and manage virtual machines (VMs) becomes possible through a web front end. I recently attended the IBM SmartCloud Entry for Power Systems workshop in Sydney, and was impressed by what I saw. The following article is my first impression of the product, albeit with limited exposure to its full potential.



Exploring the Boost Graph Library

03 Dec 2012 05:00:00 +0000

Get to know the Boost Graph Library, a generic graph library that helps C++ developers convert practical engineering problems into graph-theory problems.



ksh_timer

28 Nov 2012 05:00:00 +0000

ksh_timer helps ksh script developers or administrators to find out quickly and with minimal change in their script, what functions or user-defined sections are time consuming. By default, ksh_timer will time the overall script and each function defined and used in the script. Users can define additional sections of the scripts they need to be timed.



Inline assembly - start from scratch

20 Nov 2012 05:00:00 +0000

This article is for C/C++ programmers who use inline assembly and are working on the IBM® POWER® processor architecture. It presents two scenarios to introduce the basic usage and basic syntax of inline assembly for beginners. The article also poses intermediate-level questions and, by answering these, makes it clear how and why common mistakes can happen. Some tips are also included for coding practice.



Introduction to IBM Active Cloud Engine

09 Nov 2012 05:00:00 +0000

This article provides an introduction to the new IBM Active Cloud Engine capability of the IBM Scale Out Network Attached Storage (SONAS). Active Cloud Engine provides a competitive edge to IBM network-attached storage (NAS) offerings.