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Category Archives: Virtualization


Active Directory Virtualization Safeguards with VM-GenerationID on VMware vSphere

Written on August 20, 2019 at 3:05 PM, by

Arriving at the fifth part of this series on Virtualizing Domain Controllers on vSphere, I managed to gather some feedback on these blogposts. One question that emerged after writing the last blogpost on Replication considerations for Domain Controllers running on VMware vSphere was: Isn’t Windows Server 2012 supposed to solve all these challenges with virtualizing […]

Replication considerations for Domain Controllers running on VMware vSphere

Written on August 13, 2019 at 11:56 AM, by

Active Directory utilizes a multi-master replication model. It’s great that each Domain Controller provides read and write access to the Active Directory database, but it comes with a big drawback: Domain Controllers need to be in sync to provide consistent data to clients, independent of the Domain Controller communicated to. A big question to ask […]

Managing Active Directory Time Synchronization on VMware vSphere

Written on July 18, 2019 at 2:20 PM, by

One of the hardest things to get right with virtual Domain Controllers is the time hierarchy in Active Directory. Recommended practices from Microsoft have been all over the place, but seem to have solidified in the last years, but the question remains: How do I manage Active Directory Time Synchronization on VMware vSphere? This is […]

Sizing Domain Controllers correctly on VMware vSphere

Written on July 11, 2019 at 2:20 PM, by

In the first part of this series, we discussed why we want to virtualize Domain Controllers. The first question people ask is: How do I properly size Domain Controllers on my virtualization platform? Specifically, for VMware vSphere, this is a good question, because there are a couple of areas of attention, beyond the recommended practices […]

Why virtualize Domain Controllers?

Written on July 9, 2019 at 10:03 AM, by

One of the questions I get asked a lot is: Why virtualize Domain Controllers? So, in this blogpost, I’m showing you reasons why virtualization for Domain Controllers and Active Directory is a good idea. I also know there are a lot of caveats when virtualization Domain Controllers, so this blogpost serves as a small part […]

The video for ‘Virtualizing Active Directory the Right Way’ from VMware’s VMworld 2018 US event is now available

Written on September 12, 2018 at 10:33 AM, by

In August, Matt Liebowitz and I presented a 60-minute breakout session during VMware’s VMworld US 2018 event at the Mandalay Bay Convention Center in Las Vegas, Nevada. Our presentation and demos were recorded. Both the stage, the slides and the screen of the demo machine were captured by the VMworld organization. If you were unable […]

Pictures of VMware VMworld US 2018

Written on September 4, 2018 at 6:02 PM, by

Last week, I delivered three sessions at VMware’s VMworld US 2018 event in Las Vegas. As I was scheduled to present a full-day workshop on Sunday August 26th, I decided to fly in on Friday, so I’d have the entire Saturday to cope with the jetlag that accompanies crossing 9 time zones. My inbound flight […]

Join me for an Active Directory and Virtualization webinar, in cooperation with Veeam

Written on March 3, 2017 at 6:01 PM, by

This year, as a Veeam Vanguard, I’m hosting a series of three Active Directory Domain Services webinars, together with Timothy Dewin and hosted by Veeam. Now that we’ve got the basics covered in our Active Directory 101 session two weeks ago, It’s time to talk Active Directory virtualization on March 7, 2017. I’m very excited […]

KnowledgeBase: ERROR_GEN_FAILURE [0x0000001f] when attempting to join VMware vCenter Server Appliance 6 U1 to a Windows Server 2012 R2-based Active Directory domain

Written on September 24, 2015 at 9:33 AM, by

An issue has been identified when you try and join a VMware vCenter Server Appliance (VCSA) version 6 Update 1 to a Windows Server 2012 R2-based Active Directory domain. You receive an error and the VCSA is not joined to the domain.    The situation The VMware vCenter Server Appliance (VCSA) is a virtual installation […]

Running downlevel VMs on Windows 10 Hyper-V? Update the Integration Components

Written on March 10, 2015 at 7:36 PM, by

I’m seeing lots of people adopting the Technical Previews of Windows 10 and Windows Server 2016 around me, and running Virtual Machines (VMs) on the built-in Hyper-V hypervisor seems to be among the scenarios tested thoroughly. Microsoft has issued a KnowledgeBase article detailing an update in the Integration Components (ICs) for Windows 7, Windows 8.1, […]