[Qemu-devel] [Bug 603878] Re: [Feature request] qemu-img option about recompressing

[Thomas Huth]

** Changed in: qemu
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/603878

Title:
  [Feature request] qemu-img option about recompressing

Status in QEMU:
  New

Bug description:
  Suppose I have a fresh compressed qcow2 image. After some time the
  data were recorded without compression. I decide to make "QEMU-IMG
  convert" for that image to reduce its size.

  I want a new option, which selects between the two algorithms overdriven 
images:
  1. extract all / compress again when converting images (in the current 
implementation)
  2. compress only uncompressed blocks and just copy the compressed blocks 
without re-compression.

  This option is only needed when converting compressed image to
  compressed and the compression algorithm is the same.

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