From owner-freebsd-fs@FreeBSD.ORG  Mon Aug 13 06:07:17 2012
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From: Petri Helenius <petri@helenius.fi>
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Date: Mon, 13 Aug 2012 09:01:57 +0300
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Subject: zero deleted blocks
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Hi,

Is it possible to have ZFS or UFS to zero out the deallocated blocks to =
facilitate VM disk compaction?

Pete