From: maarten <maarten@ultratux.net>
To: 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, 4 Jan 2005 01:15:36 +0100 [thread overview]
Message-ID: <200501040115.36729.maarten@ultratux.net> (raw)
In-Reply-To: <200501032136.j03LaJ915438@www.watkins-home.com>
On Monday 03 January 2005 22:36, Guy wrote:
> Maarten said:
> "Doing the math, the outcome is still (200% divided by four)= 50%.
> Ergo: the same as with a single disk. No change."
>
> Guy said:
> "I bet a non-mirror disk has similar risk as a RAID1."
>
> Guy and Maarten agree, but Maarten does a better job of explaining it! :)
>
> I also agree with most of what Maarten said below, but not mirroring
> swap???
Yeah... bad choice in hindsight.
But, there once was a time, a long long time ago, that the software-raid howto
explicitly stated that running swap on raid was a bad idea, and that by
telling the kernel all swap partitions had the same priority, the kernel
itself would already 'raid' the swap, ie. divide equally between the swap
spaces. I'm sure you can read it back somewhere.
Now we know better, and we realize that that will indeed loadbalance between
the various swap partitions, but it will not provide redundancy at all.
Oh well, new insights huh ? ;-)
Maarten
next prev parent reply other threads:[~2005-01-04 0:15 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
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 [this message]
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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