[Bug 636491] [NEW] VMBuilder can't create preallocated disk images

Yann Hamon yann at mandragor.org
Sun Sep 12 17:57:05 BST 2010

Public bug reported:

Disk operations are extremely slow when the disk image (qcow2) needs to
grow. Using the latest 10.4 vmbuilder (and also the latest from soren's
ppa) - the disk images are set to grow, and grow megabyte by megabyte -
I haven't found the parameter to tell vmbuilder to create preallocated

As a result, operations that are disk/intensive, done directly after the
installation, and that require the disk image to grow, are painfully
slow (like installing several packages on a newly installed system). A
workaround would be to create a huge 1GB file straight after the
installation and remove it, just so that the disk image doesn't need to
grow anymore, but I don't like this option too much :)

** Affects: vm-builder (Ubuntu)
     Importance: Undecided
         Status: New

VMBuilder can't create preallocated disk images
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