puppetlabs/puppet-acceptance — pull request #464 by sschneid (2013-05-30 22:24:56+00:00)
Title: Use linked clones (copy-on-write)

This pull lets us use linked clones (copy-on-write) for deployment of vCloud templates. It sets each template's disk to a read-only "delta disk", which supposedly is necessary in order for COW-clones to work.

In my cursory testing, this cuts deployment time down by about half.