IRPStackSize and Clusters.

What is IRPStackSize? IRPStackSize stands for I/O Request Packets (IRPs) Stack Size. The count of IRP stack locations used by default for AFD (Ancillary function driver). Specifies how many stack locations the Server service (srv.sys) establishes for I/O Request Packets (IRPs). On some Windows Server 2003 RTM/SP1/R2/SP2 Failover Clusters, it might be necessary to increase… Read more

We Are Hiring!!

At Microsoft, we’re working toward a future where everyone’s potential can be fulfilled. What about yours? We offer opportunities around the world to make an impact with the next generation of technology we’re building today. We invite you to explore, dream big and learn more about what we can offer you. Do you want to… Read more

10 Cool new things to look forward to in Failover Clustering in Windows 2008

10. Improved maintenance mode for disk resources. Need to take a snapshot of a disk or run chkdsk? Now the cluster will allow you to keep the resource online but unavailable for client use. What this means? No more downtime or reboots to do disk maintenance. 9. No more cluster HCL. We got rid of… Read more

The Blog Backlog

While we try to provide you with information we feel is valuable, it is impossible for us to cover everything. So we wanted to share a list of some of the other blogs that we read on a daily basis. Data Protection Manager specific blog Blogs from our Escalation Engineers about debugging Virtualization blogs Consulting… Read more

Windows Server 2008 Failover Clustering Public Content

Here is a listing of the public content currently available on the Microsoft site for Windows Server 2008 Failover Clustering.  Of particular note is the new troubleshooting information which contains a listing of common error messages you may run into and some recommended troubleshooting steps you can take before ever having to consult with a… Read more

Using System File Checker (SFC) To Fix Issues

Both Windows Vista and Windows Server 2008 include the System File Checker (SFC) tool. Previous operating systems included this tool also. This discussion is specific to Windows Vista and Windows Server 2008. If you would like more information on previous operating systems see the following KB article: SFC scans and checks all Windows Resource… Read more

Yes, you CAN run Windows on your Mac!

Yes, that’s right, running Windows on a Mac.  This isn’t new to those of us who have been using virtualization, but with the introduction of the Intel-based Macs, users have a whole new area to explore running Windows or Windows based applications. For virtualization, there were many options to run on the older Mac OS… Read more

How to configure Windows Vista to support running Virtual Server R2 SP1

If you’re trying to run Virtual Server on Vista, you need to do two things. STEP 1: Enable IIS and the correct settings. To do this, go to Control Panel and under the Programs category click on Windows Features to Turn Windows features on and off. Here you will see a long list of features… Read more

So what does Cluster Recovery actually recover anyway?

The Windows Server 2003 Resource Kit introduced a handy, easy-to-use utility that even warranted its own download link on However the name “Cluster Recovery” can lead to misunderstanding and taken at face value makes quite a bold statement. So what exactly does this handy utility actually recover? ClusterRecovery.exe in fact performs two completely independent… Read more

Symptom based cluster disk failure troubleshooting

One of the most common issues with Windows Failover clustering deals with the storage attached to the cluster. This post is meant to give a very high-level overview to disk troubleshooting methodologies and how to narrow down the source of problems even before any logs or diagnostic data is gathered. This post will deal particularly… Read more