Roman Khan

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An Army of Million Hacked IoT Devices Almost Broke the Internet Today

A massive Distributed Denial of Service (DDoS) attack against Dyn, a major domain name system (DNS) provider, broke large portions of the Internet on …

Domain Names

Linux Command Line tips that every Linux user should know.

Below is the collection of Linux command line tips which I’ve found useful for Linux users. To get more information about the command mentioned below …

Your Real-World Git Cheat Sheet

The Git version control system is pretty nice, a useful evolution from Subversion, CVS, and other older version control systems. It's especially …

Data Science Cheat Sheet

Data Science

Follow These Steps for Configuration of PowerHA HyperSwap

<i>Editor’s note: This is the second in a three-part series about PowerHA SystemMirror for AIX Enterprise Edition. Part one, “HyperSwap Helps Keep</i> …

Databases

IT Pro

Network problem determination: AIX tools for a system administrator: Part 1, The basics of network troubleshooting

This two-part series discusses the tools that can assist the systems administrator in diagnosing TCP/IP network-related issues on AIX. This first …

Crowdsourcing: expose IBM AIX Memory Pool total and free frame count in vmstat

Why do page outs to disk paging space occur in AIX, even when vmstat and other tools indicate there is plenty of available server memory?<p>There are …

IBM PowerHA SystemMirror cluster migration

IBM® PowerHA® SystemMirror is an application that makes a system fault resilient and reduces downtime of applications or databases. This article …

Optimizing AIX 7 operating system performance, Part 1: Disk I/O overview and long-term monitoring tools (sar, nmon, and topas)

Learn more about configuring and monitoring AIX 7 based on the investigations of AIX 7 beta compared to the original articles based on AIX 5L. The …

IBM Power 7 Problem Case: Unexpected paging resolved by disabling memory_affinity

A system running Oracle on IBMPower AIX was seeing lots of paging space traffic, and I was pulled in. Even when paging space writes occurred, vmstat …

IT Pro

Microsoft BUILD 2018: Day One Keynote News and Notes<p>The Microsoft BUILD 2018 Conference kicked off with major keynotes by CEO Satya Nadella and Cloud …

Artificial Intelligence

Using a post-migration script with nimadm

I’ve received a couple of requests for an example of using a post migration script with <b>nimadm</b>. What follows is a simple example of using such a …

Improving the AIX Shell History

The Shell History file has saved my bacon many, many times. So many times I have used it to figure out what happened with a server after some kind of …

HMC V7.7 R8 : lpar profile is now synchronized with current configuration

I upgraded my HMC two weeks ago, and this morning I had this message, while trying to change a LPAR’s profile attribute :<p>Why ? WHY ???<p>To sum up, now …

Command-line

Hardware Management Console : Be autonomous with upgrade, update, and use the Integrated Management Module

I’m sure that like me you do not have a physical access to your <i>Hardware Management Consoles</i>, or even if you have this access, some of your <i>HMC</i> are so …

Linux

AIX Virtual Ethernet Link Status

I wanted to mention a new AIX feature, available with AIX 7.1 TL3 (and 6.1 TL9) called the ‘AIX Virtual Ethernet Link Status’ capability. Previous …

Performance Optimization and Tuning Techniques for IBM Power Systems Processors Including IBM POWER8

<b>Draft Redbook, last updated: Fri, 24 Jul 2015</b>- Learn optimization strategies for the new IBM POWER8 processor<br>- Apply strategies to IBM POWER7 and IBM …

Change AIX device default attributes with "chdef" command

I recently got an email from Dan Aldridge with some information about a very handy AIX command, "<b>chdef</b>". I wasn't familiar with this command before, …

UNIX Health Check - Removing files by inode

You will encounter them from time to time: files with weird filenames, such as spaces, escape codes, or uncommon characters. These often can be very …

Linux

Getting bosboot errors, don’t reboot just yet

You are about to reboot your system for some planned maintenance, perhaps through some upgrade or migration. For this process to complete, you issue …

Using AIX VG mirroring in combination with hardware snapshots

One of the great things about Logical Volume Managers is how you can use them for all manner of clever solutions. I recently explored how to use a …

IBM Power Systems™ Hardware Management Console

Tips<p>Arrange the sections on this page to see the updates you care about most at the top. Or, use the Recent Updates view in the community navigation …

Restoring mksysb

Every week, most AIX administrators take a weekly mksysb backup of rootvg. When it completes without problem, they generally shove it off to tape and …

Linux

20 Unix/Linux Command Line Tricks - Part I

Unix and Linux command line tricks for the cli user. Enjoy!

Command-line

A Shell Primer: Master Your Linux, OS X, Unix Shell Environment

On a Linux or Unix-like systems each user and process runs in a specific environment. An environment includes variables, settings, aliases, functions …

UNIX

Using secure shell (SSH) for login and secure copy (SCP) for data transfer on Linux

SSH stands for secure shell. It is an encrypted remote login protocol. Once it has been set up on each node, it can be used to communicate with …

Linux

100 Useful Unix Commands

<b>A Guide to 100 (ish) Useful Unix Commands</b> <i><br>by Oliver; 2014-05-28</i><p>Introduction<p>In the Introduction to Unix (which I'll borrow heavily from in this …

Linux

List of Free And Open Source Monitoring System

The Linux monitoring systems are often used to follow system resources, such as CPU load, the amount of free RAM, network traffic statics or memory …