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  • Blog Post: Deciphering Storport Traces 101

    Welcome back to the CORE Team Blog -- Paul Reynolds here. In previous blogs, I wrote about how to capture Storport traces in Windows 8 and Windows 2012. Please see: Tracing with Storport in Windows 2012 and Windows 8 with KB2819476 hotfix And Tracing with Storport in Windows 2012 and...
  • Blog Post: Is Offloaded Data Transfers (ODX) working?

    Offloaded Data Transfers (ODX) is a new data transfer strategy that makes advancements in moving files. Only storage devices that comply with the SPC4 and SBC3 specifications will work with this feature. With this feature, copying files from one server to another is much quicker. This feature is only...
  • Blog Post: 2012R2 iSCSI Target Settings for Configuring a Specific Network

    Let's say you have a 2012R2 iSCSI Target Server with multiple networks configured. We all know that iSCSI traffic should be on a separate network. So how do you go by configuring iSCSI to use a specific network on the target server? In previous version of Windows this was much easier to find since...
  • Blog Post: What's New in Defrag for Windows Server 2012/2012R2

    Hello everyone, I am Palash Acharyya, Support Escalation Engineer with the Microsoft Platforms Core team. In the past decade, we have come a long way from Windows Server 2003 to all the way to Windows Server 2012R2. There has been a sea-change in the overall Operating System as a whole, and we have added...
  • Blog Post: I/O Performance impact of running Start-DedupJob with –Priority High

    My name is Steven Andress and I am a Support Escalation Engineer with Microsoft’s Platforms Support Team. This is a short blog post to alert you to a condition you might encounter when running a deduplication job using the Start-DedupJob PowerShell cmdlet. Start-DedupJob http://technet.microsoft...
  • Blog Post: Cannot Extend Simple Virtual Disk in Windows Server 2012 R2

    I’m writing this blog to help shed some light on extending simple virtual disks in Windows Server 2012 R2. We have had questions from various customers that have been using simple virtual disk and need to add more space to them. Let’s say you used Server Manager to create a new Storage...
  • Blog Post: Alternate Data Streams in NTFS

    This blog has been a long time coming. There is a bit of confusion about the subject of alternate data streams (ADS) and no small amount of suspicion. So I want to take a few minutes to set the record straight on ADS. A couple years ago I wrote a blog on NTFS attributes. http://blogs.technet.com...
  • Blog Post: Adding a New Disk to an Existing Windows 2008 Cluster

    In prior versions of Windows Server Cluster (NT, 2000, 2003), adding a new disk to an existing cluster was often a cumbersome process. Sometimes the OS would not recognize the new disk. Sometimes the Cluster would not be able to add a new disk resource. Sometimes it took a reboot of the OS to detect...
  • Blog Post: The Four Stages of NTFS File Growth

    In my quest to better understand the interworking of how NTFS stores information on disk, I have been researching what happens to a file as it grows in size and complexity.   The reason I’m after this knowledge is so I can better troubleshoot certain storage issues.   Recently, I realized that...
  • 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: Compacting a Dynamically Expanding virtual hard disk in Windows Server 2012

    The process to compact a dynamically expanding virtual hard disk (vhd) in Windows Server 2012 has changed slightly from previous versions of Windows. It is still recommended that you defrag the drive in advance. Also be aware, if the virtual hard disk is not NTFS formatted, you must prepare the virtual...
  • Blog Post: EVENT ID 55: When Good Bits Go Bad

    My name is William Effinger, and I am a Senior Support Escalation Engineer with the Windows Core team at Microsoft. Some of the most common questions we get here at the storage team center around CHKDSK. If you have ever come across any event ID 55s in your system event log, this blog is for you. What...
  • Blog Post: NTFS MetaFiles

    They sit there, hiding in the root directory… metafiles .   The shell hides them from the user, but they are still there…lurking.   Microsoft does a pretty good job hiding these files so you don’t accidentally damage them.   But what are these files and how does NTFS use them? Before we...
  • Blog Post: GPT in Windows

    GUID Partition Table or GPT is a standard that’s been around for a while but is still not completely understood by the masses.  So I wanted to do a quick blog to address some of the common questions we  hear from day to day. Previously in my blog entitled Understanding the 2 TB Limit in Windows...
  • Blog Post: Alignment changes in Windows 2008 and 2008 R2

    Disk alignment, partition alignment, offset alignment…whatever you like to call it, it was very important back in the Windows 2000/2003 days.   Different storage configurations could make use of the Windows ability to align its volumes to predetermined sectors.   The benefit was increased disk...
  • Blog Post: GPT and Failover Clustering

    Its Robert Mitchell again and I’m back to talk about my favorite subject, storage.   I’ve had a number of people ask me about how GPT disks are used in conjunction with Windows Failover Cluster.   So I wanted to take a few minutes to clear up any misconceptions there might be on how this works...
  • Blog Post: Where’s my disk space?

    I have worked a few customer cases lately that have had the same issue.   Explorer shows that a disk has plenty of disk space available.   When you look at the same disk in Disk Management, you see that it is almost full.   One thing that can cause this is leftover shadow copies.  ...
  • Blog Post: Tracing with Storport in Windows 2012 and Windows 8 without KB2819476 hotfix

    Welcome back to the CORE Team Blog. Paul Reynolds here. I would like to let everyone know about changes on how to capture Storport traces in Windows Server 2012 and Windows 8. Previously, Bob Golding wrote a blog on how to do this in Windows 2008 and Windows 2008 R2. If you have Windows 2008 or 2008...
  • Blog Post: Measuring Disk Latency with Windows Performance Monitor (Perfmon)

    My name is Flavio Muratore and I am a Senior Support Escalation Engineer with the Windows Core Team. One subject we haven’t written much about in the Core team blog is “disk performance”. Today I would like to talk a little bit about measuring Physical Disk IO Latency with Windows Performance Monitor...
  • Blog Post: Open File Security Warning Prompt during Deployment

    Today’s blog is going to cover an issue we have seen a couple of times now with customers utilizing Microsoft Deployment Toolkit (MDT) to Deploy Windows although it can happen with any deployment tool out there. Issue: During deployment of Windows or even after Windows is deployed you see an Open File...
  • Blog Post: Configuring Storage Using Volume GUIDs in Hyper-V

    A question the CORE Team gets asked frequently deals with configuring Hyper-V Guest storage using Volume GUIDs instead of drive letters. In this blog I will cover this topic. Volume GUID Storage Storage in a Hyper-V Guest can be referenced by way of a Volume Globally Unique Identified (GUID). This is...
  • Blog Post: Understanding the 2 TB Limit in Windows Storage

    “Why can’t I have a drive bigger than 2 TB?” This is a common question.   And as storage has gotten bigger and cheaper, I see it more and more.   So let’s take a few minutes to talk about the mysterious 2 TB limit. There are actually three different 2 TB limitations that are commonly hit.....
  • Blog Post: Tracing with Storport in Windows 2012 and Windows 8 with KB2819476 hotfix

    Welcome back to the CORE Team Blog. Paul Reynolds here. I would like to let everyone know about changes on how to capture Storport traces in Windows Server 2012 and Windows 8. NOTE: The information below is based on having hotfix KB2819476 installed (part of the April 2013 cumulative update for Windows...
  • Blog Post: Where Did My Space Go?

      While working on Windows 8/Windows Server 2012, I have been tied up with other content creation projects and as such have not had time to write for AskCore. However, I’ve had a number of blog ideas rattling around in my head. Today I finally found some time to get one of them committed to paper...
  • Blog Post: NTFS File Attributes

    It is time once again to delve into the fascinating world of NTFS! So far I’ve outlined how files become more complex as they grow, the different metafiles found in the MFT, and then the different parts of Windows storage that results in the infamous 2TB size limitation. Today I want to list out most...