Category Archives: ESXi

Powershell/ESXCLI – EMC VPLEX changing multipathing policy

By | May 7, 2012

When connecting some storage systems to vSphere, vSphere sometime doesn’t select the most optimal multipathing policy. I came across the above problem when adding an EMC VPLEX storage system to a  large vSphere 4.1 installation. vSphere selected the Fixed path multipathing policy. In smaller environments this isn’t normally a problem , but when a Fixed policy is selected in… Read More »

Time keeping in a virtual enviroment

By | April 12, 2010

Time keeping in a virtual environment can be a challenge to setup. To help you, VMware has maintained a KB on the subject. The KB presents best practices for achieving accurate timekeeping in Windows Guest operating systems. These recommendations include a suggested configuration for timesynchronization in the guest and on the host. A more… Read More »

Extend disk with snapshots – How to fix the error

By | October 29, 2009

Yesterday I by mistake extended a disk on a VM that had snapshots. Using vmkfstools. Kind of like this thread ( This resulted in the following PowerOn error: Failed to power on Servername on Host in Cluster: Cannot open the disk ‘/vmfs/volumes/LUN/Folder/VM.vmdk’ Reason: The parent virtual machine disk has been modified since the child was… Read More »

A must have for anyone using PowerShell to control VMware

By | September 17, 2009

VMware have released a demo on YouTube that shows a “must have” for PowerShell users who automate and manage vSphere and vCenter through PowerShell. The project is named “Onyx” and works like a middelware between the vCenter Client and the vCenter Server. Onyx is unfortunately still in a private beta and therefore not acceble to… Read More »

Need to see how secure your “babies” is ??

By | February 10, 2009

Have you ever needed to verify the security or hardened state of you ESX hosts? If yes, then these tools from or will help you make the process easier. If no, take a look at the tools anyway – it’s always nice to know if your “babies” are safe ;-). Compliance Checker… Read More »

Graph history on your ESX enviroments development

By | January 5, 2009

2 years ago a VMUG user in Denmark created a Ubuntu VM that could graficily could show the develeoment of the amount of VM’s in a Cluster. Unfurtionally someone stole my labtop and the VM :-). So I had to create a new. And of cause it’s based on PowerShell ;-). The webpages shows the… Read More »

BULK upgrading VM’s memory

By | December 20, 2008

Today I had to upgrade all our Jumphost VM’s from 256MB to 512MB of memory (more than 200 VM’s). There are two ways accomplice this. 1. Do it manually (Very time consuming) 2. Script it with PowerShell As the lazy person I am I decided that scripting was the way forward. The script I came… Read More »