[libvirt-users] preallocation=full Vs preallocation=metadata

[Jatin Davey]

Hi All

I was reading through this:

http://kashyapc.com/2011/12/02/little-more-disk-io-perf-improvement-with-fallocateing-a-qcow2-disk/

I was basically searching for pointers on improving disk I/O.

I wanted to know the purpose of preallocation=full & 
preallocation=metadata , What is the difference between them ? and which 
one would yield a better disk I/O speed ?

Appreciate your responses in this regard.

Thanks
Jatin
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