From: davidsen@tmr.com (bill davidsen)
To: linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE] Ext3 vs Reiserfs benchmarks
Date: 17 Jul 2002 18:41:59 GMT [thread overview]
Message-ID: <ah4dpn$2tj$1@gatekeeper.tmr.com> (raw)
In-Reply-To: 20020715211448.GI442@clusterfs.com
In article <20020715211448.GI442@clusterfs.com>,
Andreas Dilger <adilger@clusterfs.com> wrote:
| Well, the dump can only be inconsistent for files that are being changed
| during the dump itself. As for hanging the system, that would be a bug
| regardless of whether it was dump or "dd" reading from the block device.
| A bug related to this was fixed, probably in 2.4.19-preX somewhere.
Any dump on a live f/s would seem to have the problem that files are
changing as they are read and may not be consistant. I suppose there
could be some kind of "fsync and journal lock" on a file, allowing all
writes to a file to be journaled while the file is backed up. However,
such things don't scale well for big files with lots of writes, and the
file, while unchanging, may not be valid.
Backups of running files are best done by the application, like Oracle
as a for-instance. Neither the o/s nor the backup can be sure when/if
the data is in a valid state.
Tar has this problem, although not the same issues with data on the fly
in buffers.
--
bill davidsen <davidsen@tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
next prev parent reply other threads:[~2002-07-17 18:44 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-12 16:21 [ANNOUNCE] Ext3 vs Reiserfs benchmarks Dax Kelson
2002-07-12 17:05 ` Andreas Dilger
2002-07-12 17:26 ` kwijibo
2002-07-12 17:36 ` Andreas Dilger
2002-07-12 20:34 ` Chris Mason
2002-07-13 4:44 ` Daniel Phillips
2002-07-14 20:40 ` Dax Kelson
2002-07-15 8:26 ` Sam Vilain
2002-07-15 12:30 ` Alan Cox
2002-07-15 12:02 ` Sam Vilain
2002-07-15 13:23 ` Alan Cox
2002-07-15 13:40 ` Chris Mason
2002-07-15 19:40 ` Andrew Morton
2002-07-15 15:12 ` Andrea Arcangeli
2002-07-15 16:03 ` Andreas Dilger
2002-07-15 16:12 ` Daniel Phillips
2002-07-15 17:48 ` Sam Vilain
2002-07-15 18:47 ` Mathieu Chouquet-Stringer
2002-07-15 19:26 ` Sam Vilain
2002-07-16 8:18 ` Stelian Pop
2002-07-16 12:22 ` Gerhard Mack
2002-07-16 12:49 ` Stelian Pop
2002-07-16 15:11 ` Gerhard Mack
2002-07-16 15:22 ` Andrea Arcangeli
2002-07-16 15:39 ` Stelian Pop
2002-07-16 19:45 ` Matthias Andree
2002-07-16 20:04 ` Shawn
2002-07-16 20:11 ` Mathieu Chouquet-Stringer
2002-07-16 20:22 ` Shawn
2002-07-16 20:27 ` Mathieu Chouquet-Stringer
2002-07-17 11:45 ` Matthias Andree
2002-07-17 19:02 ` Andreas Dilger
2002-07-18 9:29 ` Matthias Andree
2002-07-19 8:29 ` Matthias Andree
2002-07-19 16:39 ` Andreas Dilger
2002-07-19 20:01 ` Shawn
2002-07-19 20:47 ` Andreas Dilger
2002-07-15 21:14 ` Andreas Dilger
2002-07-17 18:41 ` bill davidsen [this message]
2002-07-17 19:47 ` [ANNOUNCE] Ext3 vs Reiserfs benchmarks (whither dump?) Lew Wolfgang
2002-07-16 8:15 ` [ANNOUNCE] Ext3 vs Reiserfs benchmarks Stelian Pop
2002-07-16 12:27 ` Matthias Andree
2002-07-16 12:43 ` Stelian Pop
2002-07-16 12:53 ` Matthias Andree
2002-07-16 13:05 ` Christoph Hellwig
2002-07-16 19:38 ` Matthias Andree
2002-07-16 19:49 ` Andreas Dilger
2002-07-16 20:11 ` Thunder from the hill
2002-07-16 21:06 ` Matthias Andree
2002-07-16 21:23 ` Andreas Dilger
2002-07-16 21:38 ` Thunder from the hill
2002-07-17 11:47 ` Matthias Andree
2002-07-18 14:50 ` Bill Davidsen
2002-07-18 15:09 ` Rik van Riel
2002-07-16 22:19 ` Backups done right (was [ANNOUNCE] Ext3 vs Reiserfs benchmarks) stoffel
2002-07-16 22:33 ` Thunder from the hill
2002-07-18 15:04 ` Bill Davidsen
2002-07-18 15:27 ` Rik van Riel
2002-07-18 15:50 ` stoffel
2002-07-18 16:29 ` Bill Davidsen
2002-07-19 15:28 ` Sam Vilain
2002-07-17 18:51 ` [ANNOUNCE] Ext3 vs Reiserfs benchmarks bill davidsen
2002-07-18 9:32 ` Matthias Andree
2002-07-15 12:09 ` Matti Aarnio
[not found] <20020712162306$aa7d@traf.lcs.mit.edu>
[not found] ` <mit.lcs.mail.linux-kernel/20020712162306$aa7d@traf.lcs.mit.edu>
2002-07-15 15:22 ` Patrick J. LoPresti
2002-07-15 17:31 ` Chris Mason
2002-07-15 18:33 ` Matthias Andree
[not found] ` <20020715173337$acad@traf.lcs.mit.edu>
[not found] ` <mit.lcs.mail.linux-kernel/20020715173337$acad@traf.lcs.mit.edu>
2002-07-15 19:13 ` Patrick J. LoPresti
2002-07-15 20:55 ` Matthias Andree
2002-07-15 21:23 ` Patrick J. LoPresti
2002-07-15 21:38 ` Thunder from the hill
2002-07-16 12:31 ` Matthias Andree
2002-07-16 15:53 ` Thunder from the hill
2002-07-16 19:26 ` Matthias Andree
2002-07-16 19:38 ` Thunder from the hill
2002-07-15 21:59 ` Ketil Froyn
2002-07-15 23:08 ` Matti Aarnio
2002-07-16 12:33 ` Matthias Andree
2002-07-15 22:55 ` Alan Cox
2002-07-15 21:58 ` Matthias Andree
2002-07-15 21:14 ` Chris Mason
2002-07-15 21:31 ` Patrick J. LoPresti
2002-07-15 22:12 ` Richard A Nelson
2002-07-16 1:02 ` Lawrence Greenfield
[not found] ` <mit.lcs.mail.linux-kernel/200207160102.g6G12BiH022986@lin2.andrew.cmu.edu>
2002-07-16 1:43 ` Patrick J. LoPresti
2002-07-16 1:56 ` Thunder from the hill
2002-07-16 12:47 ` Matthias Andree
2002-07-16 21:09 ` James Antill
2002-07-16 12:35 ` Matthias Andree
2002-07-16 7:07 ` Dax Kelson
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