linux-ext4 - Re: Ext3 behavior on power failure

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Date:	Wed, 28 Mar 2007 09:17:27 -0400 (EDT)
From:	"John Anthony Kazos Jr." <jakj@...-k-j.com>
To:	Jan Kara <jack@...e.cz>
cc:	Ric Wheeler <ric@....com>, armangau_philippe@....com,
	ext3-users@...hat.com, linux-ext4@...r.kernel.org,
	csar@...nford.edu
Subject: Re: Ext3 behavior on power failure

>  If you fsync() your data, you are guaranteed that also your data are
> safely on disk when fsync returns. So what is the question here?

Pardon a newbie's intrusion, but I do know this isn't true. There is a 
window of possible loss because of the multitude of layers of caching, 
especially within the drive itself. Unless there is a super_duper_fsync() 
that is able to actually poll the hardware and get a confirmation that the 
internal buffers are purged?
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