Re: [Fedora-xen] Guest Image File Size
Daniel P. Berrange wrote:
On Sat, Dec 01, 2007 at 02:03:06PM -0500, Mark Nielsen wrote:
> I think you'll get the same sort of thing if you gzip the file. I've
> gzip'd some 20G xen images down to around 2G.
AFAIR, this is just because sparse files appear as long sequences of
zeros & thus compress wel - gzip isn't actually optimizing for sparseness.
The trouble is that when you extract the file gunzip will fully allocate
it filling with zeros.
undo that with "cp --sparse"
--
Cheers
John
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