Operating systems

OTN Appreciation Day : OSWatcher Black Box Analyzer (OSWBBA)

Following my last blog post about OSWatcher, I will present in this one OSWatcher Black Box Analyzer (OSWBBA), which is the tool that you can use to display graphically the data collected by OSWBB. This tool is(…)

OTN Appreciation Day : OSWatcher Black Box (OSWBB)

In this post, I will present a usefull and easy-to-use Oracle tool : OSWatcher. What is it ? OSWatcher Black Box (OSWBB), for its full name, is a free Oracle Tool which will help you to diagnose(…)

Disable Red Hat 7 Transparent Hugepages

Ausgangslage Ein Kunde hat mich kürzlich angefragt, wie am effizientesten alle Kernel Tuning Parameter für Oracle bei Red Hat 7 konfiguriert werden können. Daraus habe ich untersucht welche Möglichkeiten es gibt, ausser dem seit langer Zeit bekannten /etc/sysctl.conf. Bei dieser Analyse(…)

Generate Azure VM with Resource Manager deployment in PowerShell

Recently, there is a new way to manage the Azure infrastructure with Resource Manager. It brings many advantages regarding the classic deployment. The differences between these two deployments will not be covered in this blog because it is(…)

List usernames instead of uids with the ps command for long usernames

By William Sescu Have your ever faced such a situation. You have usernames in your /etc/passwd file with more than 8 characters. This is no problem for Linux at all, usernames may be up to 32 characters long, only your(…)

How to do a Filesystem Resize (ext3/ext4) on Redhat running on VMware

By William Sescu A filesystem resize can be done in several ways, online, offline, with LVM2 or without LVM2.  However, this blog will describe how to do an online resize of ext3/ext4 filesystems where a virtual disk (vmdk) is online(…)

Shrinking Oracle VM VirtualBox with Zerofree

In this blog I would like to talk about Shrinking a Virtual Machine with Oracle databases and MySQL which is install. Unfortunately, whilst Virtual Box will dynamically expand the hard drive as it’s required, it won’t dynamically shrink it(…)

SCOM: schedule group maintenance task with PowerShell

In my last blog post, here, I spoke about how to place SCOM group in maintenance mode. This script is really interesting with an integration in Windows Task Scheduler. At the end, the main purpose is to plan a(…)

SCOM: change group state to maintenance mode with PowerShell

Some weeks ago, I wrote a blog post about the creation of SCOM groups in order to subscribe to alerts. Subscribe to alert is mandatory, of course, to be able to receive alerts concerning our group. But during operations(…)

Windows Failover Cluster : Introduction to paxos tag

A couple of days ago, I was in charge to install a new SQL Server AlwaysOn and availability group with one of my colleague Nathan Courtine. During the installation, we talked about testing a disaster recovery(…)