From owner-freebsd-fs@FreeBSD.ORG  Wed Dec 16 12:26:39 2009
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Date: Wed, 16 Dec 2009 06:26:37 -0600
From: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
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To: Borja Marcos <borjam@sarenet.es>
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Cc: freebsd-fs <freebsd-fs@freebsd.org>
Subject: Re: zfs receive gives: internal error: Argument list too long
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Borja Marcos wrote:
> Weird, this was one of the virtual machines that crashed often when doing the zfs send/zfs receive tests. Maybe something was damaged?

Using ZFS in a Virtual Machine is a risky business since many VM hosts
(VMware and VirtualBox at least) discard any SYNCHRONIZE issued by the
guest.  VirtualBox has a way to turn SYNCHRONIZE functionality back on. 
Make sure you know how the VM software handles SYNCHRONIZE or FLUSH
before using ZFS there.