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  • Blog Post: Virtual Machine Checkpoint fails with Access Denied when running on a Clustered Shared Volume

    When you attempt to create a CheckPoint of a virtual machine that is running on a Cluster Shared Volume (CSV) , you may receive a General access denied error as shown below. You will receive this error if the virtual machine’s VHD is placed on the root of the drive. The reason for...
  • Blog Post: Failover Clustering and Active Directory Integration

    My name is Ram Malkani and I am a Support Escalation Engineer on Microsoft’s Windows Core team. I am writing to discuss how Failover Clustering is integrated with Active Directory on Windows Servers. Windows Server Failover Clustering, has always had a very strong and cohesive attachment with...
  • Blog Post: Configuring Windows Failover Cluster Networks

    In this blog, I will discuss the overall general practices to be considered when configuring networks in Failover Clusters. Avoid single points of failure: Identifying single points of failure and configuring redundancy at every point in the network is very critical to maintain high availability...
  • Blog Post: RAP as a Service (RaaS) from Microsoft Services Premier Support

    In this post, I’m excited to discuss a new Premier Support offering called Risk Assessment Program (RAP) as a Service (or RaaS for short) . For those that are not familiar with RAP, it is a Microsoft Services Premier Support offering that helps prevent serious issues from occurring by analyzing...
  • Blog Post: How to add a Pass-through disk to a Highly Available Virtual Machine running on a Windows Server 2012 R2 Failover Cluster

    I was recently asked how to add a Pass-through disk to a Highly Available VM running on a Windows Server 2012 R2 Failover Cluster. I tested the steps I was accustomed to for Windows Server 2008 and found the Disk to be in a ReadOnly state in the VM. As it turns out there are differences in how you add...
  • Blog Post: Unable to launch Cluster Failover Manager on any node of a 2012/2012R2 Cluster

    When Failover Cluster Manager is opened to manage a Cluster, it will contact all the nodes and retrieve Cluster configuration information using WMI calls. If any one of the nodes in the Cluster does not have the cluster namespace "root\mscluster" in WMI, Failover Cluster Manager will fail and...
  • Blog Post: Looking for Windows Server 2012 Clustering and Hyper-V Hotfixes?

    In a previous blog , it was discussed on where you can get a list of the Failover Clustering and Hyper-V hotfixes for Windows Server 2008 R2. Looking for Windows Server 2008 R2 Cluster and Hyper-V Hotfixes? http://blogs.technet.com/b/askcore/archive/2013/02/15/looking-for-windows-server-2008-r2...
  • Blog Post: Windows Server 2012 Failover Cluster Sessions at TechEd

    Start getting familiar with Windows Server 2012 Failover Clustering by viewing the sessions that were delivered at TechEd 2012. These sessions are posted online now for your viewing pleasures. For those not familiar with what TechEd is, I offer this. TechEd is Microsoft's premier technology conference...
  • Blog Post: MMS 2013 Hands On Labs Available

    A few months ago we held the annual 2013 Microsoft Management Summit in Las Vegas. As in years past, the event sold out quickly and it was a very busy week. To everyone that attended, our sincere thanks. As a recap, the below blog gives you the list of available sessions online to view that deal with...
  • Blog Post: TechEd 2013 Presentations and Videos Ask the Core Team favorites

    Today’s blog is a listing of our favorite videos and presentations that recently occurred at TechEd 2013. I have gone through them and picked what we think are the most important to the technologies our team supports. Deployment/Client Windows Server 2012 Windows Server 2012 R2 Azure...
  • Blog Post: Keeping backups of Cluster Logs

    In a previous blog, Understanding the Cluster Debug Log in 2008 , you were given the information on how Cluster logging in Windows 2008 Failover Clustering and beyond has changed from the earlier versions. In this blog, you were shown how the size of the log can be manipulated in order to keep a recommended...
  • Blog Post: FIXED: Cluster Shared Volumes (CSV) in redirected access mode after installing McAfee VSE 8.7 Patch 5 or 8.8 Patch 1

    A fix for the above titled problem has been released. If you are running into this problem, please downlaod and install the following fix on all Clusters running McAfee and wanting the updates they provide. 2674551 Redirected mode is enabled unexpectedly in a Cluster Shared Volume when you are...
  • Blog Post: FREE: Online Microsoft Virtual Academy Virtualization Jump Start Classes

    The IT Pro Evangelism team, Microsoft Learning and the Microsoft Virtual Academy are pleased to announce the next Jump Start courses! Introduction to Hyper-V Thursday, January 24th This one-day live event is designed for IT Pros experienced in virtualization (i.e., VMware) but in need of...
  • Blog Post: Having a problem with nodes being removed from active Failover Cluster membership?

    Welcome to the AskCore blog. Today, we are going to talk about nodes being removed from active Failover Cluster membership randomly. If you are having problems with a node being removed from membership, you are seeing events like this logged in your System Event Log: This event will be logged on...
  • Blog Post: Sessions from MMS 2013 Now Available

    Greetings AskCore fans. I thought I would start creating a blog for a subset of the videos/sessions available at each of the conferences that Microsoft has throughout the year. These sessions will be available and will deal with topics that are discussed here on the AskCore Blog. There are numerous other...
  • Blog Post: Removing a Mount Point Disk from a Cluster Group

    Hello everyone. Today’s post is going to cover the steps needed to follow should you ever have to remove a ‘Physical Disk’ resource from a clustered service or application where that disk is configured as a mount point. Removing a disk from a group may be needed if the application no...
  • Blog Post: Live Customer Q&A with Virtualization Experts! (Microsoft Virtual Academy)

    The IT Pro Evangelism team, Microsoft Learning and the Microsoft Virtual Academy are pleased to announce the next FREE & PUBLIC event Live Q&A: Introduction to Hyper-V on Wednesday April 3 rd , from 8:30 am – 10:00am PST with virtualization experts Jeff Woolsey (Principal Program Manager...
  • Blog Post: Just when you thought… (Part 2)

    In Part 1 , I covered configuring the Hyper-V Failover Cluster and the Scale-Out File Server solution. In Part two, I will cover: Creating the file shares in the Scale-Out File Server Creating a virtual machine to use the SMB3.0 shares in the Scale-Out File Server Verifying we can Live Migrate the virtual...
  • Blog Post: FREE: Microsoft Virtualization for VMware Professionals Training

    The Microsoft Virtual Academy training portal offers quick and easy access to presentations, webcasts, whitepapers and other technical content about Microsoft’s Cloud technologies. It is public, free and you learn at your own pace while earning awards and recognitions, and connecting with over...
  • Blog Post: CNO Blog Series: Increasing Awareness around the Cluster Name Object (CNO)

    I am starting a 'CNO Blog Series', which will consist of blogs written by the CORE team cluster engineers and will focus primarily on the Cluster Name Object (CNO). The CNO is the computer object in Active Directory associated with the Cluster Name; it is used as a common identity in the cluster. If...
  • Blog Post: Nodes being removed from Failover Cluster membership on VMWare ESX?

    Welcome to the AskCore blog. Today, we are going to talk about nodes being removed from active Failover Cluster membership when the nodes are hosted on VMWare ESX. I have documented node membership problems in a previous blog: Having a problem with nodes being removed from active Failover Cluster membership...
  • Blog Post: Error in Failover Cluster Manager after install of KB2750149

    On Tuesday, Jaunary 8, the below recommended fix was released and available on Windows Update for Windows .NET Framework 4.5. 2750149 An update is available for the .NET Framework 4.5 in Windows 8, Windows RT and Windows Server 2012 http://support.microsoft.com/kb/2750149/EN-US When installing...
  • Blog Post: New Network Name Resource Fails to come Online

    I recently encountered an issue involving the failure of a new Network Name resource to come online.   Doing some investigation I found a number of instances where this has been encountered, with different resolutions provided.   Since no root cause was defined, fellow Directory Services Engineer...
  • Blog Post: Why is the CNO in a Failed State?

    Hello, my name is Steven Graves and I am a Support Escalation Engineer (SEE) in the Platforms Support group here at Microsoft. One of the technologies I support is Windows Server Failover Clustering. I’d like to take a couple of minutes to share some information on an issue I previously worked on. The...
  • Blog Post: Looking for Windows Server 2008 R2 Cluster and Hyper-V Hotfixes?

    I often get asked the question by customers on how to find the newly released hotfixes for Cluster and Hyper-V or the customer wants to know what hotfixes are out there. We have 3 Wiki pages that will make life easier for you when looking for hotfixes for Windows Server 2008 R2 Cluster and Hyper-V. You...