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Is it ok to disable disk write cache on a Windows software mirror?

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  • Is it ok to disable disk write cache on a Windows software mirror?

    I'm running into this issue:
    http://support.microsoft.com/kb/330174
    Delayed Write Failed
    I have a Windows software mirror on two 2TB drives. Write cache is enbaled on both of them. Is it ok to disable write cache on them (the microsoft article above recommends that), or will that mess anything up because it is a Windows software mirror?

  • #2
    Re: Is it ok to disable disk write cache on a Windows software mirror?

    when you say it's a software mirror, what do you mean.. ?

    If it';s just a software library, and you rarely write to it (but it's more commonly used to load/install applications from) then it should be ok to turn off write cache.

    write cache is basically used to allow faster writing to disks - instead of writing it all mechanically, it writes some into cache, to allow it to be written later..
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    • #3
      Re: Is it ok to disable disk write cache on a Windows software mirror?

      I work on the theory that if you don't have a UPS attached to your Server/Workstation (or a BBU on a hardware RAID controller) then delayed write back should be disabled. If you have a power hickup or similar then you can have data loss during the delayed write.

      A UPS will at least supply power until the write has been completed.
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