• Microsoft will redesign chkdsk and the new NTFS health model for windows 8

    On windows' blog, there is a blog about the new NTFS health model for Windows 8 and our redesigned tool for disk corruption detection and fixing, the chkdsk utility. This new NTFS aims to increase availability and reduce the overall down-time of systems; this feature, along with other storage features such as Storage Spaces and the new ReFS file system, helps reduce the complexity of fixing corruptions and increases the overall availability of the entire system.

    The new design included changes both in the file system and the chkdsk utility to ensure the best availability. The new design splits the process into the following phases to ensure a coordinated, rapid, and transparent resolution to the corruption.

    Attachment 536

    They developed a new method of communication that describes types of corruptions as “verbs” that act upon the key components and points of the design – the file system driver (NTFS), the self-healing module, the spot-verification service, and the chkdsk utility. All file system corruptions are classified as needing one of 18 different “verbs” that we’ve defined in Windows 8. We have also left room for possible new verb definitions that can help us diagnose issues even better in the future.

    In the new health model, the file system health status transitions through four states – some that are simply informational, and others that require you to act. The health states are:

    * Online and healthy
    * Online spot verification needed
    * Online scan needed
    * Spot fix needed

    Attachment 537

    1. Online and healthy – In this state there are no detected file system corruptions and there is no action required of you. The file system remains in this state most of the time.

    2. Online spot verification needed – The file system stays in this transient state only for a brief instant after the file system finds a corruption that it cannot self-heal; it puts the volume in this state until the spot verification service verifies the corruption. Again, there is no user action required.

    3. Online scan needed– When the spot-verification service confirms the corruption, it puts the file system in the “online scan needed” state. In the next maintenance window, an online scan is performed; there is no user action required. This state is reflected in the Action Center, so you can run the scan manually if you want to do that before the next maintenance window. The scan is run as a background operation, which means that you can continue using the computer while the scan is performed. During this online scan, all verified issues and fixes are logged for later repair. On Windows Server 8 systems, idle time is determined by monitoring the CPU and storage idle times.

    4. Spot fix needed– The file system puts the volume in this state after the online scan is completed, if required, and this state is reflected in the Action Center. On client systems, you can restart the PC to fix all the file system issues logged in the previous step. The restart is quick (adding just a few additional seconds) and the PC is returned to a healthy state. For Windows Server 8 systems, a restart is unnecessary to fix corruptions on data volumes. Administrators can simply schedule a spot fix during the next maintenance window.

    Source: blogs.msdn.com
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