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"
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Cheers
John
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