Alan <alan <at> peak.org> writes:
> 
> I was just thinking of a similar "feature request": one of the things
> I'm doing is hosting vm's.  I build a base vm with standard setup in a
> dedicated filesystem, then when I need a new instance "zfs clone" and voila!
> ready to start tweaking for the needs of the new instance, using a fraction
> of the space.

This is OT but FYI some virtualization apps have built-in support for exactly 
what you want, you can create disk images that share identical blocks between 
themselves.

In Qemu/KVM this feature "copy-on-write disk images":
$ qemu-img create -b base_image -f qcow2 new_image

In Microsoft Virtual Server, there is also an equivalent feature but I can't 
recall how it is called.

-marc

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