8 Responses

  1. Disable Windows Disk Write Cache for Data Integrity and Better Performance — Long White Virtual Clouds | Farhan Parkar's Weblog

    […] via Disable Windows Disk Write Cache for Data Integrity and Better Performance — Long White Virtual Cl… […]

  2. Fabian Brash
    Fabian Brash at |

    Awesome article, in my testing I was not able to turn caching off on my C: drive but it worked perfectly on my data drive(s)

    Reply
  3. How to Performance Test 101 in 5 Steps | Long White Virtual Clouds

    […] all started from a tweet in response to some test results that I had written about in my article Disable Windows Disk Write Cache for Data Integrity and Better Performance. Michael White suggested I write something up about how to perf test. Thanks for the inspiration […]

  4. A little about Disk write cache on Windows VM | StarWind Blog
  5. Windows Script for Marking All Disks Online | Long White Virtual Clouds

    […] to turn off write cache by changing the Windows Disk Policy to Quick Remove as I mentioned in this article, before starting any performance […]

  6. Not Disclosed
    Not Disclosed at |

    The reason your first test was so slow is because a cache has to store the files first. Many caching mechanisms will actually count file accesses and only cache files or blocks if they are used two times. So if you are interested in testing cached I/O with synthetic benchmarking software then you need to use the same files (not random) and you won’t see the results until the second or third run. If your test is showing the results of the first run then its not cached I/O that you’re getting, its only the disk I/O speed. You need to try the results on the third run,but the test files must be identical. Just an fyi, best regards…

    Reply
  7. Sean
    Sean at |

    is switching it disruptive? Will down time be needed

    Reply

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