ZFS under the hood.
"In practice, finding free space this way would be insufferable because it would take far too long for any filesystem of non-trivial size. To make the allocation and freeing of blocks fast, the filesystem needs an efficient way to keep track of free space. In this post we'll examine the most common methods, why they don't scale well, and the new approach we devised for ZFS." Space Maps : Jeff Bonwick's Blog
(Submitted by Noel Thu Sep 27, 2007 )
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