linux-ext4 - RE: Ext3 behavior on power failure

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Message-ID: <A74E8B4A356D8143B79BBEB839421F300415A86B@CORPUSMX20B.corp.emc.com>
Date:	Wed, 28 Mar 2007 10:17:33 -0400
From:	armangau_philippe@....com
To:	<jakj@...-k-j.com>, <jack@...e.cz>
Cc:	<ric@...imap.lss.emc.com>, <ext3-users@...hat.com>,
	<linux-ext4@...r.kernel.org>, <csar@...nford.edu>
Subject: RE: Ext3 behavior on power failure

In my case the disk cache is not a  problem - We use an emc disk array
the write cache is protected - 
Once the data has made over the disk array we can assume it is safe - 
Thx 
Philippe  

-----Original Message-----
From: John Anthony Kazos Jr. [mailto:jakj@...-k-j.com] 
Sent: Wednesday, March 28, 2007 9:17 AM
To: Jan Kara
Cc: wheeler, richard; armangau, philippe; 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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