From: Pavel Machek <pavel@suse.cz>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Rob Landley <rob@landley.net>,
kernel list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
tytso@mit.edu, mtk.manpages@gmail.com, rdunlap@xenotime.net,
linux-doc@vger.kernel.org
Subject: Re: document ext3 requirements
Date: Mon, 5 Jan 2009 10:45:04 +0100 [thread overview]
Message-ID: <20090105094504.GB27199@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <yq1r63i30bv.fsf@sermon.lab.mkp.net>
> >>>>> "Pavel" == Pavel Machek <pavel@suse.cz> writes:
>
> Pavel> Does this sound like a fair summary?
>
> Pavel> Sector writes are atomic (ATOMIC-SECTORS)
> Pavel> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> I'd just like to point out that the all-or-nothing hardware sector
> atomity thing is -- to a large extent -- a myth.
It is a myth that linux filesystems depend on for safe operation :-(.
> It is mostly true on SCSI class devices because various UNIX, RAID array
> and database vendors have spent many years leaning very hard on the
> drive manufacturers to make it so.
>
> But it's not a hard guarantee, you can't get it in writing, and it's not
> in any of the standards. Hybrid drives with flash had potential to
> close that particular loophole but those appear to be dead in the water.
So "in practice it works but vendors will not guarantee that"?
How much true is it for normal SATA drives? Are there some tests I can
just run on a machine, powercycle it few times, and it tells me if my
disk is non-ATOMIC-SECTORS?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-01-05 9:45 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-03 12:38 document ext3 requirements Pavel Machek
2009-01-03 21:17 ` Martin MOKREJŠ
2009-01-03 22:06 ` Pavel Machek
2009-01-03 22:17 ` Duane Griffin
2009-01-03 22:29 ` Pavel Machek
2009-01-03 23:01 ` Martin MOKREJŠ
2009-01-03 23:38 ` Duane Griffin
2009-01-03 23:50 ` Martin MOKREJŠ
2009-01-03 23:58 ` Robert Hancock
2009-01-04 0:08 ` Martin MOKREJŠ
2009-01-04 21:49 ` Ingo Oeser
2009-01-04 0:00 ` Duane Griffin
2009-01-04 0:11 ` Martin MOKREJŠ
2009-01-04 0:41 ` Duane Griffin
2009-01-04 3:52 ` Valdis.Kletnieks
2009-01-04 14:24 ` Duane Griffin
2009-01-04 18:40 ` Theodore Tso
2009-01-04 19:21 ` Geert Uytterhoeven
2009-01-04 19:36 ` Theodore Tso
2009-01-04 19:51 ` Duane Griffin
2009-01-04 21:55 ` Theodore Tso
2009-01-04 22:06 ` Duane Griffin
2009-01-04 22:42 ` Bron Gondwana
2009-01-05 3:22 ` Rob Landley
2009-01-04 0:19 ` Pavel Machek
2009-01-05 2:55 ` Rob Landley
2009-01-04 19:56 ` Rob Landley
2009-01-05 19:16 ` Theodore Tso
2009-01-06 19:20 ` Rob Landley
2009-01-06 10:08 ` Matthias Andree
2009-01-06 15:23 ` Theodore Tso
2009-01-03 23:12 ` Duane Griffin
2009-01-06 10:06 ` Matthias Andree
2009-01-04 2:32 ` Theodore Tso
2009-01-04 22:33 ` Pavel Machek
2009-01-04 22:34 ` [patch] document ext3 a bit better Pavel Machek
2009-01-05 14:57 ` Theodore Tso
2009-01-06 9:21 ` Pavel Machek
2009-01-09 23:24 ` Jiri Kosina
2009-01-09 23:36 ` Randy Dunlap
2009-01-09 23:47 ` Jiri Kosina
2009-01-04 13:35 ` document ext3 requirements Alexander E. Patrakov
2009-01-04 13:53 ` Valdis.Kletnieks
2009-01-04 18:21 ` Michael Tokarev
2009-01-04 18:38 ` Theodore Tso
2009-01-04 22:37 ` Pavel Machek
2009-01-04 23:58 ` Theodore Tso
2009-01-05 11:43 ` Alan Cox
2009-01-07 11:59 ` Rob Landley
2009-01-04 20:10 ` Pavel Machek
2009-01-04 19:49 ` Rob Landley
2009-01-04 22:06 ` Theodore Tso
2009-01-04 22:25 ` Pavel Machek
2009-01-04 23:00 ` [patch] " Pavel Machek
2009-01-05 2:42 ` Rob Landley
2009-01-05 9:54 ` Pavel Machek
2009-01-04 23:07 ` Pavel Machek
2009-01-05 1:38 ` Rob Landley
2009-01-04 22:55 ` Pavel Machek
2009-01-05 0:16 ` david
2009-01-05 9:38 ` Pavel Machek
2009-01-05 1:50 ` Rob Landley
2009-01-05 3:20 ` Martin K. Petersen
2009-01-05 9:45 ` Pavel Machek [this message]
2009-01-05 11:28 ` Alan Cox
2009-01-05 19:15 ` Martin K. Petersen
2009-01-05 20:19 ` Theodore Tso
[not found] <fa.pmCH9X+XujDl6RH6/TpkNtsTnbk@ifi.uio.no>
[not found] ` <fa.b62zZFe5e154PhgA+0sdwVXD9F0@ifi.uio.no>
[not found] ` <fa.ZTpiSvxEhp3YJDepiUQs+cU0C98@ifi.uio.no>
[not found] ` <fa.xvvufQC6zTpU9R6vhDl51DR5V7A@ifi.uio.no>
[not found] ` <fa.pkV69eXC76Pb9fnmERdAwXX9OKA@ifi.uio.no>
[not found] ` <fa.hQTLXdIllf+hs4yQb092u6fowq0@ifi.uio.no>
2009-01-04 19:08 ` Sitsofe Wheeler
2009-01-04 19:31 ` Theodore Tso
2009-01-04 22:40 ` Pavel Machek
2009-01-04 23:30 ` Theodore Tso
2009-01-05 3:49 ` Rob Landley
2009-01-05 4:31 ` Robert Hancock
2009-01-05 5:00 ` david
2009-01-05 11:19 ` Alan Cox
2009-01-05 19:00 ` Rob Landley
2009-01-05 19:27 ` Martin K. Petersen
2009-01-06 10:41 ` Matthias Andree
2009-01-06 15:30 ` Theodore Tso
[not found] ` <20090106153020.GB13086__11022.1833143898$1231255950$gmane$org@mit.edu>
2009-01-06 15:40 ` Andi Kleen
2009-01-06 15:57 ` Theodore Tso
2009-01-06 17:31 ` Andi Kleen
2009-01-06 19:31 ` Rob Landley
2009-01-27 13:24 ` Thierry Vignaud
2009-01-27 13:37 ` Alan Cox
2009-01-06 10:36 ` Matthias Andree
[not found] <fa.P4z5CJpM0xT37PWJuOuCHDkO76o@ifi.uio.no>
[not found] ` <fa.eOwOqydZi0qs6K1nmNxBFGQMV40@ifi.uio.no>
[not found] ` <fa.26o5IHCAC3TQdXupl62CLYwQ+Wk@ifi.uio.no>
2009-01-04 23:13 ` Sitsofe Wheeler
2009-01-05 2:51 ` Rob Landley
2009-01-05 3:33 ` Martin K. Petersen
2009-01-05 4:02 ` david
2009-01-05 3:52 ` Rob Landley
[not found] ` <fa.GBkQuKdRj+YRVczlNLFhGvaw3WY@ifi.uio.no>
[not found] ` <fa.rCyCghh/+staAmYi/+gwYvefIS0@ifi.uio.no>
[not found] ` <fa.c5j7jAMUnJPvgI9Oj/VczSDNakE@ifi.uio.no>
[not found] ` <fa.377DMq2lPMyaHxadPnApFSJFoCg@ifi.uio.no>
2009-01-05 20:36 ` Sitsofe Wheeler
2009-01-05 23:09 ` Theodore Tso
[not found] ` <fa.ucJLoSQwk9OAj6T6x60tbWaiTAo@ifi.uio.no>
2009-01-05 22:25 ` Sitsofe Wheeler
2009-01-06 4:08 ` Rob Landley
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