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From: Ben Myers <bpm@sgi.com>
To: Stefan Ring <stefanrin@gmail.com>
Cc: Steve Bergman <sbergman27@gmail.com>,
	Ric Wheeler <rwheeler@redhat.com>, Linux fs XFS <xfs@oss.sgi.com>
Subject: Re: Questions about XFS
Date: Tue, 11 Jun 2013 12:59:22 -0500	[thread overview]
Message-ID: <20130611175922.GR20932@sgi.com> (raw)
In-Reply-To: <CAAxjCEyne63XH1Uk6_7jzjaxDbsSopO9E+=6oo3xE=PvjBFcjA@mail.gmail.com>

Hey Stefan,

On Tue, Jun 11, 2013 at 07:27:59PM +0200, Stefan Ring wrote:
> > In a second example, let's say you are copying data to disk (say a movie) at
> > a rate of 50 MB/second.  When the power cut hits at just the wrong time, you
> > will have lost a large chunk of that data that has been "written" to disk
> > (over 200MB).
> 
> But why would anyone care about that? I know that the system went down
> while copying this large movie, so I'll just copy it again.

You don't always have enough storage to keep that first copy around
indefinitely, so you want to have some guarantees about whether the 2nd
copy has made it to the platter before you allow the first one to be
overwritten.

e.g. You could have a set of remote closed circuit cameras with limited
local storage and want to transfer frames from them to a central
location without losing any.

-Ben

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  parent reply	other threads:[~2013-06-11 17:59 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-11  9:56 Questions about XFS Steve Bergman
2013-06-11 13:10 ` Emmanuel Florac
2013-06-11 13:35 ` Stefan Ring
2013-06-11 13:52 ` Ric Wheeler
2013-06-11 13:59 ` Ric Wheeler
2013-06-11 16:12   ` Steve Bergman
2013-06-11 17:19     ` Ric Wheeler
2013-06-11 17:27       ` Stefan Ring
2013-06-11 17:31         ` Ric Wheeler
2013-06-11 17:41           ` Stefan Ring
2013-06-11 18:03             ` Eric Sandeen
2013-06-11 19:30           ` Steve Bergman
2013-06-11 21:03             ` Dave Chinner
2013-06-11 21:43               ` Steve Bergman
2013-06-11 17:59         ` Ben Myers [this message]
2013-06-11 17:28     ` Eric Sandeen
2013-06-11 19:17       ` Steve Bergman
2013-06-11 21:47         ` Dave Chinner
2013-07-22 14:59       ` Steve Bergman
2013-07-22 15:16         ` Steve Bergman
2013-06-12  8:26     ` Roger Oberholtzer
2013-06-12 10:34       ` Ric Wheeler
2013-06-12 13:52         ` Roger Oberholtzer
2013-06-12 12:12       ` Stan Hoeppner
2013-06-12 13:48         ` Roger Oberholtzer
2013-06-13  0:48       ` Dave Chinner
2013-06-11 19:35 ` Ben Myers
2013-06-11 19:55   ` Steve Bergman
2013-06-11 20:08     ` Ben Myers
2013-06-11 21:57     ` Matthias Schniedermeyer
2013-06-11 22:18       ` Steve Bergman
  -- strict thread matches above, loose matches on Subject: below --
2013-10-25 14:28 harryxiyou
2013-10-25 14:42 ` Emmanuel Florac
2013-10-25 14:57   ` Eric Sandeen
2013-10-25 16:24     ` harryxiyou
2013-10-25 16:44     ` harryxiyou
2013-10-26 10:41     ` Stan Hoeppner
2013-10-27  3:29       ` Eric Sandeen
2013-10-25 16:13   ` harryxiyou
2013-10-25 16:16     ` Eric Sandeen
2007-03-13 13:40 clflush
2007-03-13 15:36 ` Klaus Strebel
2007-03-13 15:53 ` Stein M. Hugubakken
2007-03-13 15:55 ` Eric Sandeen
2007-03-14 16:33 ` Stewart Smith
2007-03-15  4:26   ` Taisuke Yamada
2007-03-15  9:07     ` clflush
2007-03-15 14:41       ` Geir A. Myrestrand
2007-03-16 10:36       ` Martin Steigerwald
2007-03-17  0:47         ` Jason White

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