My name is Andreas Lesslhumer and I live near Wels, Austria.

Running-System.com was originally started as a personal knowledge base to write down solutions for my everyday work.

During the time the number of visitors increased significantly and I started blogging for a wider audience.

Nowadays the blog is mostly about technology with a focus on virtualization, security, backup/restore and disaster recovery. But it’s also about topics like cloud, networking, and storage.


Since August 2018 I work as a Senior Systems Engineer at Veeam Software. Before that I worked for the IT subsidiary of an Austrian banking group where I was responsible for the virtual infrastructure (VMware) and Backup and Disaster Recovery (Veeam).


The vCommunity is very important to me. It’s a big advantage to be in the company of smart people because this motivates me to do better and I can learn from them a lot.

This is the reason why I volunteer as a leader for the VMware User Group (VMUG) in Austria and why I am involved in community programs like vExpert, Veeam Vanguard or Cisco Champion.

Social Media

  • you can follow me on Twitter @lessi001
  • write me an email using office[at]lessi.net
  • or you connect with me at XING
  • or at LinkedIn


The views expressed anywhere on this site are strictly mine and not the opinions and views of my employer.  





  1. gustavo

    Nice lab. I am also trying to setup nested esxi inside esxi.

    My server is running an Intel Xeon Processor E5540. P Proliant DL380 G6 2x Xeon Quad-Core 2.53GHz
    Bios settings
    – Intel(R) Hyperthreading Options -> enabled
    – Intel(R) Turbo Boost Technology -> enabled
    – Intel(R) VT-d -> enabled

    My server does not support VT-x/EPT.

    Can I still setup nested esxi inside nested ESXI?
    I keep getting an error in my management vm

  2. Alexa Schlosser

    Hello Andreas,

    I am the editor of VMUG’s monthly e-newsletter, VMUG Voice. Manfred Hofer suggested you as a good candidate for the “Featured Blogger” section of our e-newsletter. Is this something you would be interested in? If so, please email me at aschlosser@vmug.com.


  3. James Hakim

    Hi there,

    We’re interested in buying some ad space on your site, I have several advertisers interested in this niche.

    Would be great to get you listed on PublicityClerks.com with an ad spot for sale, let me know if interested 🙂


  4. Ondrej

    Hi, your linkedin link does not work 🙂

  5. Anirudh Srinath

    My name is Anirudh Srinath from the Marketing team at Vembu Technologies. We are a software product development company focused on Backup and Disaster recovery software for Data Centers. We offer a BDR Suite of products meant for on-premise, offsite, cloud backup and disaster recovery across diverse IT environments including physical, virtual, applications and endpoints.

    Our current focus is on our Product, Vembu VMBackup, which is a Backup and Disaster Recovery software that supports VMware vSphere and Microsoft Hyper-V environments. I happened to go through your blog website and it had some rich technical content. I would like to know if you could help us with your expertise by generating content for us in the form of Product reviews and blogs about our product which shall be posted in your website. We would to explore the sponsorship opportunities that might be available with your website.

  6. Blake Soiu


    I have followed your postings for the last 3 years for VMworld after parties. Will you be doing this again this year? If so can you share when it will begin?

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