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[Xen-users] Unbuffered File Writes from a Guest OS

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "White, Nathan" <nathan.white@xxxxxxxxx>
  • Date: Mon, 11 Sep 2006 09:40:36 -0700
  • Delivery-date: Mon, 11 Sep 2006 09:41:41 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcbVwQHs+5K6uVMjSy+TPyq5xUzqwQ==
  • Thread-topic: Unbuffered File Writes from a Guest OS

In a virtualized windows guest. If I open a file using a either of the flags  FILE_FLAG_WRITE_THROUGH  or FILE_FLAG_NO_BUFFERING.

With the intent that the file be directly written to the device without buffering.

 

How is the behavior effected by the Host OS.  >From what I am gathering the no-buffering flag is not honored, and the file write is buffered by the virtualized file system.

 

Can anyone confirm this. If this is in fact what is happening. Is there any mechanism to disable this buffering?

 

 

Thanks

--Nate

 

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