ZFS Deduplication

Jeff Bonwick talks about ZFS Deduplication:

You knew this day was coming: ZFS now has built-in deduplication. If you already know what dedup is and why you want it, you can skip the next couple of sections. For everyone else, let’s start with a little background.

Read more about it at http://blogs.sun.com/bonwick/en_US/entry/zfs_dedup.