Virtualization Fabric Design Considerations Guide via @Technet

Microsoft recently published a very helpful design guide regarding fabric and network design for you Hyper-V / Microsoft private Cloud environment.

To take a look on the guide please click here.

Free Script: Fixing Hyper-V Folder Security via @AltaroHyperV

Eric Siron Senior Systems Administrator at The University of Iowa Hospitals and Clinics and blogger on Altaros Hyper-V Hub recently published a powershell script to fix folder Hyper-V folder security.

Click here to view the original blog with the script.

What you should also try out is Altaro Hyper-V Backup. You have a free licences that enables you to backup two VMs. To download the free edition please click on the banner below.


New blog page – document library

During some lazy minutes I sometimes create some sample documents for friends and customers. Normally those documents are basics for demo environments.

Today I thought I could provide some of those documents to all of you. So check out my new document library.


Now blogging together with Brocade Germany

As some of you already know, I have some prefered vendors, I work very near with.

A few months ago, I got a call from Brocade. They asked me, if I would like to blog together with them on the Brocade Germany Community. For me very unsual because I will blog in german which is my mother toungh but not prefered language. So in a few weeks, the day will be there. I will publish my first blog there. 🙂 Can’t wait to get your feedback.

The first topic will be Brocade Vyatta 5400 vRouter in conjuntion with Microsoft Hyper-V converged Network. So feel free and follow the “Brocade Deutschland Blog

Hyper-V VHD files inaccessable after reinstallation from Hyper-V host

Today I had a funny session with my coworker Jens Nilsson. Last week we encountert an issue with his Hyper-V cluster and we needed reinstall one of his hosts.

After we reinstalled the host and tried to import some of his no clustered VMs, stored on a local drive, we encounter follwing issue.

Log Name:      Microsoft-Windows-Hyper-V-VMMS-Admin
Source:        Microsoft-Windows-Hyper-V-VMMS
Date:          9/19/2014 4:11:06 AM
Event ID:      12620
Task Category: None
Level:         Error

Computer: HV02.test.local
”: Cannot get information for attachment ‘D:\virtualmachines\VHD\CLY01.vhdx’. (Virtual machine ID )



So at first we thought it was an security issue and we checked those. They were fine and no services were blocking the access. During our discussion, Jens told me, he was using Windows Server 2012 R2 data deduplication on that drive with the old installation.

Ok that was the information I needed. In our case that meas, the file was still on the disk but when you tried to open it, Windows was missing the index to reassemble the blocks belonging to the file.

Now comes the issue, how can we fix that. Our first and for us both studid idea. Lets install data depluction again. Maybe he will be able to find his index again. Aehm … you know what happens with stupid ideas? They often work, in that moment too.

Next we wanted to find out why, the only possible solution was, the index for dedup is stored in the system volume information of the drive where it is configured. Which means, when you backup a drive where you use dedup, do not forget to save the system volume information too.