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From: Thiago Damas <tdamas@gmail.com>
Date: Wed, 17 Mar 2010 18:17:04 -0300
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To: Matthew Dillon <dillon@apollo.backplane.com>
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Subject: Re: ATA 4K sector issues
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  I'll try tomorrow more zfs tests, with 1M alignment on begining of disk.
  But I also remember that zfs block size its 128k, but metadata can be of
dynamic size. And we can use compressed files too.
  There is a sysctl, md_compress, that I turned out in my tests, but not
working as expected.
  Why using gnop -S 4096 works well?

Thiago