From: Andreas Dilger <adilger@turbolabs.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Rose, Billy" <wrose@loislaw.com>,
"'Martin Dalecki'" <dalecki@evision-ventures.com>,
Mike Fedyk <mfedyk@matchmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: ext3 and undeletion
Date: Tue, 26 Feb 2002 11:15:09 -0700 [thread overview]
Message-ID: <20020226111509.J12832@lynx.adilger.int> (raw)
In-Reply-To: <4188788C3E1BD411AA60009027E92DFD063077D8@loisexc2.loislaw.com> <3C7BCD4A.9020400@zytor.com>
In-Reply-To: <3C7BCD4A.9020400@zytor.com>; from hpa@zytor.com on Tue, Feb 26, 2002 at 10:00:42AM -0800
On Feb 26, 2002 10:00 -0800, H. Peter Anvin wrote:
> Rose, Billy wrote:
> > My company can tolerate 0% loss of data (which is why I raised this issue).
>
> There is no such thing as 0% loss of data. You can get some amount of
> security with backups, snapshots (really useful!) or undelete, but you
> can *NEVER* guarantee 0% loss of data... consider the case when a
> (l)user overwrites (not just deletes) a newly created file.
Snapshots at the filesystem level could handle the overwrite case.
However, even then it cannot be 0% loss of data, unless you have snapshots
for _every_ write of the file, which would quickly become prohibitive in
space usage (think autobackup from an editor on a large file). Sometimes
people just have to learn from their mistakes...
Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/
next prev parent reply other threads:[~2002-02-26 18:17 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-26 17:48 Rose, Billy
2002-02-26 17:53 ` Martin Dalecki
2002-02-26 18:03 ` Mike Fedyk
2002-02-26 17:56 ` Rik van Riel
2002-02-26 19:41 ` Andreas Dilger
2002-02-26 18:00 ` H. Peter Anvin
2002-02-26 18:15 ` Andreas Dilger [this message]
2002-02-26 18:23 ` Jakob Østergaard
2002-02-26 18:19 ` David Lang
2002-02-26 18:29 ` Andreas Ferber
2002-02-27 21:00 ` James D Strandboge
2002-02-27 21:40 ` Alan Cox
2002-02-27 22:16 ` James D Strandboge
2002-02-27 22:33 ` Alan Cox
2002-02-27 23:03 ` James D Strandboge
2002-02-28 0:29 ` James D Strandboge
2002-03-04 2:17 ` Mike Fedyk
2002-03-04 15:12 ` Alan Cox
2002-03-04 15:33 ` Mike Fedyk
2002-03-04 19:17 ` James D Strandboge
2002-03-04 20:08 ` Jesse Pollard
2002-03-02 17:36 ` Pablo Alcaraz
-- strict thread matches above, loose matches on Subject: below --
2002-03-05 23:04 Rose, Billy
2002-03-06 20:03 ` Mark Mielke
2002-03-07 21:30 ` Patrick Lynch
2002-02-28 10:37 Randal, Phil
2002-02-26 18:39 Dana Lacoste
2002-02-26 18:47 ` Daniel Gryniewicz
2002-02-26 18:51 ` David Lang
[not found] <fa.n4lfl6v.h4chor@ifi.uio.no>
2002-02-25 17:06 ` Dan Maas
2002-02-25 17:20 ` Mike Fedyk
2002-02-25 23:33 ` Tom Rauschenbach
2002-02-26 0:27 ` Bernd Eckenfels
2002-02-26 5:53 ` H. Peter Anvin
2002-02-26 16:05 ` Mike Fedyk
2002-02-26 16:31 ` H. Peter Anvin
2002-02-26 16:40 ` Mike Fedyk
2002-02-26 16:55 ` H. Peter Anvin
2002-02-26 17:12 ` Mike Fedyk
2002-02-26 16:36 ` Martin Dalecki
2002-02-26 16:43 ` Mike Fedyk
2002-02-26 16:54 ` Martin Dalecki
2002-02-26 17:05 ` Mike Fedyk
2002-02-26 17:07 ` Martin Dalecki
2002-02-26 17:16 ` Mike Fedyk
2002-02-26 17:22 ` Rik van Riel
2002-02-26 17:38 ` Mike Fedyk
2002-02-26 18:14 ` Andreas Ferber
2002-02-26 18:55 ` Andreas Dilger
2002-02-26 22:04 ` Mike Fedyk
2002-02-26 18:34 ` Richard B. Johnson
2002-02-26 18:34 ` H. Peter Anvin
2002-02-26 18:47 ` Richard B. Johnson
2002-02-26 18:52 ` Andreas Dilger
2002-02-28 15:05 ` Andreas Ferber
2002-02-28 22:37 ` Andreas Dilger
2002-03-01 4:44 ` Mike Fedyk
2002-03-04 16:26 ` Pavel Machek
2002-03-05 21:29 ` Andreas Ferber
2002-03-06 11:30 ` Pavel Machek
2002-03-05 22:07 ` Richard B. Johnson
2002-02-28 22:55 ` James D Strandboge
2002-02-26 17:22 ` Mike Fedyk
2002-03-01 0:19 ` Rick Lindsley
2002-03-01 1:02 ` Andreas Dilger
2002-02-26 17:54 ` Andreas Dilger
2002-02-26 18:24 ` Alan Cox
2002-03-04 15:40 ` Pavel Machek
2002-02-25 18:08 ` Richard B. Johnson
2002-02-25 18:40 ` Mike Fedyk
2002-02-25 19:49 ` Andreas Dilger
2002-02-25 16:46 Rose, Billy
2002-02-25 3:27 Steven Walter
2002-02-25 5:08 ` Andreas Dilger
2002-02-25 10:16 ` Fabrice Bellet
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