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Re: Data safety horror stories?

To: "Iustin Pop" <iusty@xxxxxxxxx>
Subject: Re: Data safety horror stories?
From: "Felix E. Klee" <felix.klee@xxxxxxx>
Date: Mon, 11 Feb 2008 22:23:09 +0100
Cc: "xfs-oss" <xfs@xxxxxxxxxxx>
In-reply-to: <20080211171209.GA7567@teal.hq.k1024.org>
References: <1202748389.28320.1236240801@webmail.messagingengine.com> <20080211171209.GA7567@teal.hq.k1024.org>
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Hi Justin,

thanks for the info!

On Mon, 11 Feb 2008 18:12:09 +0100, "Iustin Pop" <iusty@xxxxxxxxx> said:
> No, XFS will not lose any data that the application has committed to
> the disk.

OK, but just to make sure: The following FAQ entry refers only to
*newly* created files - right?

http://oss.sgi.com/projects/xfs/faq.html#nulls

> Improperly written applications and/or improperly configured systems
> might have issues with recently written files losing data.

Again, just to make sure that I understood you correctly: Could you name
an example?

> Be sure the read the FAQ, especially the section about write cache on
> dekstop/consumer HDDs.

You are probably referring to the following entry.  I now disabled the
write cache of the 2nd HDD in Windows (remember my configuration).  I
wonder though: Wouldn't it be possible to design journaling in a way so
that the write cache does never cause problems? Could someone provide an
example which illustrates the write cache problem in simple terms?

http://oss.sgi.com/projects/xfs/faq.html#wcache

> Just my opinion as an XFS user, your mileage might vary.

Hopefully, it's not about opinions ...

- Felix
-- 
Dipl.-Phys. Felix E. Klee
Naunynstr. 2, 76530 Baden-Baden, Germany
Tel.: +49 7221 396961, Fax: +49 7221 396960, Mobile: +49 174 1386060
http://www.linkedin.com/in/feklee


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