June, 2010

  • Updated Requirements and Limits for Virtual Machines and Hyper-V in Windows Server 2008 R2

    Last week during the VDI day I still mentioned that we only supported 64 virtual machines running on a clustered Hyper-V infrastructure. Well we’ve changed the support limits of virtual machines running in a clustered environment towards 1000 VM’s per cluster and still a max of 384 VM’s on each node.

    Below you can find the table that explains the max limit for failover clusters. Have a look at the full table on the TechNet library

    Failover Clusters and Hyper-V

    The following table lists the maximums that apply to highly available servers running Hyper-V. It is important to do capacity planning to ensure that there will be enough hardware resources to run all the virtual machines in a clustered environment. For more information about requirements for failover clusters and Hyper-V, see Hyper-V: Using Hyper-V and Failover Clustering (http://go.microsoft.com/fwlink/?LinkID=129063).

    Component Maximum Notes

    Nodes per cluster


    Consider the number of nodes you want to reserve for failover, as well as maintenance tasks such as applying updates. We recommend that you plan for enough resources to allow for 1 node to be reserved for failover, which means it remains idle until another node is failed over to it. (This is sometimes referred to as a passive node.) You can increase this number if you want to reserve additional nodes. There is no recommended ratio or multiplier of reserved nodes to active nodes; the only specific requirement is that the total number of nodes in a cluster cannot exceed the maximum of 16.

    Running virtual machines per cluster and per node

    1,000 per cluster, with a maximum of 384 on any one node

    Several factors can affect the real number of virtual machines that can be run at the same time on one node, such as:

    • Amount of physical memory being used by each virtual machine.

    • Networking and storage bandwidth.

    • Number of disk spindles, which affects disk I/O performance.

  • VDI Day Sessions online

    Last week we organized a Virtual Desktop Infrastructure day together with Citrix. We’ve published the sessions onto TechNet Edge.

    Session 1: VDI Day: Citrix & Microsoft Desktop Virtualization Strategy

    In this session we will guide you through the desktop virtualization strategy and show you how Citrix and Microsoft will help you reduce the costs of Managing your virtual desktop infrastructure. We will answer questions like: “Will desktop virtualization really fit every user?”

    Speakers: Jurgen Van Duvel & Andreas Van Wingerden

    Session 2: VDI Day: Planning and Deploying VDI with Citrix and Microsoft Technology – Part 1

    In this more technical session we will drill down into the Microsoft virtualization architecture of VDI and determine what key questions need to be asked and answered around required components, networking, capacity and end user experience. In the second part of the Presentation we will drill down into the Citrix components of our joint VDI solution. You will learn what the different key components are and how to setup your own test environment.

    Speaker: Arlindo Alves – http://blogs.technet.com/b/aralves/

    Session 3: VDI Day: Planning and Deploying VDI with Citrix and Microsoft Technology – Part 2

    In the second part of the Presentation we will drill down into the Citrix components of our joint VDI solution. You will learn what the different key components are, what they add on top of the Virtualization back-end. By then end of this session you will be geared up with the knowledge to setup your own test environment.

    Speaker: Andreas Van Wingerden - Citrix

  • Hyper-V Component Architecture Poster

    Hyper-V poster is a great visual tool to help in the understanding of the key features and components. It highlights key Hyper-V components including:

    • Architecture
    • Virtual Networking
    • Virtual Machine Snapshots
    • Live Migration
    • Storage Interfaces
    • Storage Types
    • Storage Location and Paths
    • Import and Export


    Download the Hyper-V Poster

  • TechNet Magazine June Edition online

    imageOne of the greatest concerns IT managers voice over moving to cloud computing is security. How secure will my data be when stored in the cloud? How secure is the data in transit? Those are indeed valid questions and concerns. While technology vendors and cloud computing service providers have gone considerable distances to protect data and assuage any customer worries, data security remains the prevailing concern. Read more…

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