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Date: Thu, 28 Nov 2013 15:10:00 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Adam Vande More <amvandemore@gmail.com>
Subject: Re: 4k sectors
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On Thu, 28 Nov 2013, Adam Vande More wrote:

> Is there an easy method to find out the space wasted by using 4k vs 512?

Which filesystem?  UFS has block suballocation ("fragments").  It would 
be surprising if ZFS did not, but I don't know what they call it.