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Date: Fri, 07 May 2010 09:18:42 +1000
From: Andrew Snow <andrew@modulus.org>
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To: David Newman <dnewman@networktest.com>, freebsd-fs@freebsd.org
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Subject: Re: Aligning VMware VMFS on ZFS
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David Newman wrote:
> - contacted the maintainer of istgt port, who suggests a possible VMFS
> and GEOM problem such as GEOM not recognizing the VMFS format.

This is the correct answer.  GEOM simply doesn't understand how VMware 
is formatting the disk.  By default, VMware aligns VMFS partitions 
inside the LUN you give to it, so you don't really have to do anything 
when using it with ZVOLs.