From: David Greaves <david@dgreaves.com>
To: "Peter T. Breuer" <ptb@lab.it.uc3m.es>
Cc: linux-raid@vger.kernel.org
Subject: Re: ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard)
Date: Tue, 04 Jan 2005 14:43:09 +0000 [thread overview]
Message-ID: <41DAAB7D.2030400@dgreaves.com> (raw)
In-Reply-To: <qikqa2-4m2.ln1@news.it.uc3m.es>
Peter,
Can I make a serious attempt to sum up your argument as:
Disks suffer from random *detectable* corruption events on (or after)
write (eg media or transient cache being hit by a cosmic ray, cpu
fluctuations during write, e/m or thermal variations).
Disks suffer from random *undetectable* corruption events on (or after)
write (eg media or transient cache being hit by a cosmic ray, cpu
fluctuations during write, e/m or thermal variations)
Raid disks have more 'corruption-susceptible' data capacity per useable
data capacity and so the probability of a corruption event is higher.
Since a detectable error is detected it can be retried and dealt with.
This leaves the fact that essentially, raid disks are less reliable than
non-raid disks wrt undetectable corruption events.
However, we need to carry out risk analysis to decide if the increase in
susceptibility to certain kinds of corruption (cosmic rays) is
acceptable given the reduction in susceptibility to other kinds (bearing
or head failure).
David
tentative definitions:
detectable = noticed by normal OS I/O. ie CRC sector failure etc
undetectable = noticed by special analysis (fsck, md5sum verification etc)
next prev parent reply other threads:[~2005-01-04 14:43 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200501030916.j039Gqe23568@inv.it.uc3m.es>
2005-01-03 10:17 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) Guy
2005-01-03 11:31 ` Peter T. Breuer
2005-01-03 17:34 ` Guy
2005-01-03 19:20 ` ext3 Gordon Henderson
2005-01-03 19:47 ` ext3 Morten Sylvest Olsen
2005-01-03 20:05 ` ext3 Gordon Henderson
2005-01-03 17:46 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) maarten
2005-01-03 19:52 ` maarten
2005-01-03 20:41 ` Peter T. Breuer
2005-01-03 23:19 ` Peter T. Breuer
2005-01-03 23:46 ` Neil Brown
2005-01-04 0:28 ` Peter T. Breuer
2005-01-04 1:18 ` Alvin Oga
2005-01-04 4:29 ` Neil Brown
2005-01-04 8:43 ` Peter T. Breuer
2005-01-04 2:07 ` Neil Brown
2005-01-04 2:16 ` Ewan Grantham
2005-01-04 2:22 ` Neil Brown
2005-01-04 2:41 ` Andy Smith
2005-01-04 3:42 ` Neil Brown
2005-01-04 9:50 ` Peter T. Breuer
2005-01-04 14:15 ` David Greaves
2005-01-04 15:20 ` Peter T. Breuer
2005-01-04 16:42 ` Guy
2005-01-04 17:46 ` Peter T. Breuer
2005-01-04 9:30 ` Maarten
2005-01-04 10:18 ` Peter T. Breuer
2005-01-04 13:36 ` Maarten
2005-01-04 14:13 ` Peter T. Breuer
2005-01-04 19:22 ` maarten
2005-01-04 20:05 ` Peter T. Breuer
2005-01-04 21:38 ` Guy
2005-01-04 23:53 ` Peter T. Breuer
2005-01-05 0:58 ` Mikael Abrahamsson
2005-01-04 21:48 ` maarten
2005-01-04 23:14 ` Peter T. Breuer
2005-01-05 1:53 ` maarten
2005-01-04 9:46 ` Peter T. Breuer
2005-01-04 19:02 ` maarten
2005-01-04 19:12 ` David Greaves
2005-01-04 21:08 ` Peter T. Breuer
2005-01-04 22:02 ` Brad Campbell
2005-01-04 23:20 ` Peter T. Breuer
2005-01-05 5:44 ` Brad Campbell
2005-01-05 9:00 ` Peter T. Breuer
2005-01-05 9:14 ` Brad Campbell
2005-01-05 9:28 ` Peter T. Breuer
2005-01-05 9:43 ` Brad Campbell
2005-01-05 15:09 ` Guy
2005-01-05 15:52 ` maarten
2005-01-05 10:04 ` Andy Smith
2005-01-04 22:21 ` Neil Brown
2005-01-05 0:08 ` Peter T. Breuer
2005-01-04 22:29 ` Neil Brown
2005-01-05 0:19 ` Peter T. Breuer
2005-01-05 1:19 ` Jure Pe_ar
2005-01-05 2:29 ` Peter T. Breuer
2005-01-05 0:38 ` maarten
2005-01-04 9:40 ` Peter T. Breuer
2005-01-04 11:57 ` Which drive gets read in case of inconsistency? [was: ext3 journal on software raid etc] Michael Tokarev
2005-01-04 12:40 ` Morten Sylvest Olsen
2005-01-04 12:44 ` Peter T. Breuer
2005-01-04 14:22 ` Maarten
2005-01-04 14:56 ` Peter T. Breuer
2005-01-04 14:03 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) David Greaves
2005-01-04 14:07 ` Peter T. Breuer
2005-01-04 14:43 ` David Greaves [this message]
2005-01-04 15:12 ` Peter T. Breuer
2005-01-04 16:54 ` David Greaves
2005-01-04 17:42 ` Peter T. Breuer
2005-01-04 19:12 ` David Greaves
2005-01-04 0:45 ` maarten
2005-01-04 10:14 ` Peter T. Breuer
2005-01-04 13:24 ` Maarten
2005-01-04 14:05 ` Peter T. Breuer
2005-01-04 15:31 ` Maarten
2005-01-04 16:21 ` Peter T. Breuer
2005-01-04 20:55 ` maarten
2005-01-04 21:11 ` Peter T. Breuer
2005-01-04 21:38 ` Peter T. Breuer
2005-01-04 23:29 ` Guy
2005-01-04 19:57 ` Mikael Abrahamsson
2005-01-04 21:05 ` maarten
2005-01-04 21:26 ` Alvin Oga
2005-01-04 21:46 ` Guy
2005-01-03 20:22 ` Peter T. Breuer
2005-01-03 23:05 ` Guy
2005-01-04 0:08 ` maarten
2005-01-04 8:57 ` I'm glad I don't live in Spain (was Re: ext3 journal on software raid) David L. Smith-Uchida
2005-01-03 21:36 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) Guy
2005-01-04 0:15 ` maarten
2005-01-04 11:21 ` Michael Tokarev
2005-01-03 9:30 Peter T. Breuer
-- strict thread matches above, loose matches on Subject: below --
2004-12-30 0:31 PROBLEM: Kernel 2.6.10 crashing repeatedly and hard Georg C. F. Greve
2004-12-30 16:23 ` Georg C. F. Greve
2004-12-30 17:39 ` Peter T. Breuer
2004-12-30 19:50 ` Michael Tokarev
2004-12-30 21:39 ` Peter T. Breuer
2005-01-02 19:42 ` ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) Andy Smith
2005-01-02 20:18 ` Peter T. Breuer
2005-01-03 0:30 ` Andy Smith
2005-01-03 6:41 ` Neil Brown
2005-01-03 8:37 ` Peter T. Breuer
2005-01-03 8:03 ` Peter T. Breuer
2005-01-03 8:58 ` Guy
2005-01-03 12:11 ` Michael Tokarev
2005-01-03 14:23 ` Peter T. Breuer
2005-01-03 18:30 ` maarten
2005-01-03 21:36 ` Michael Tokarev
2005-01-05 9:56 ` Andy Smith
2005-01-05 10:44 ` Alvin Oga
2005-01-05 10:56 ` Brad Campbell
2005-01-05 11:39 ` Alvin Oga
2005-01-05 12:02 ` Brad Campbell
2005-01-05 13:23 ` Alvin Oga
2005-01-05 13:33 ` Brad Campbell
2005-01-05 14:12 ` Erik Mouw
2005-01-05 14:37 ` Michael Tokarev
2005-01-05 17:11 ` Erik Mouw
2005-01-06 5:41 ` Brad Campbell
2005-01-05 15:17 ` Guy
2005-01-05 15:33 ` Alvin Oga
2005-01-05 16:22 ` Michael Tokarev
2005-01-05 17:23 ` Peter T. Breuer
2005-01-05 16:23 ` Andy Smith
2005-01-05 16:30 ` Andy Smith
2005-01-05 17:07 ` Guy
2005-01-05 17:21 ` Alvin Oga
2005-01-05 17:32 ` Guy
2005-01-05 18:37 ` Alvin Oga
2005-01-05 17:26 ` David Greaves
2005-01-05 18:16 ` Peter T. Breuer
2005-01-05 18:28 ` Guy
2005-01-05 18:26 ` Guy
2005-01-05 15:48 ` Peter T. Breuer
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