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The zero fill technique
Submitted by keyboard.operator (not registered) on Fri, 2008-12-12 19:45.

The zero fill technique helps, but I found that I had to the following:

  1. Write a file filled with non-zeros.
  2. Run sync
  3. Replace that file with all zeros.
  4. Run sync.
  5. Remove the zero fill file.
  6. Shutdown the OS and then run the shrink.
I tried this when I noticed that writing all zeros does not change the size of the underlying vmdk.  I assume there is an optimization somewhere that handles the zero case.
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