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From: Krzysztof Halasa <khc@pm.waw.pl>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: Michael Loftis <mloftis@wgops.com>, linux-kernel@vger.kernel.org
Subject: Re: FYI: RAID5 unusably unstable through 2.6.14
Date: Wed, 18 Jan 2006 17:47:08 +0100	[thread overview]
Message-ID: <m3wtgxwkj7.fsf@defiant.localdomain> (raw)
In-Reply-To: <43CDA3B0.2030503@cfl.rr.com> (Phillip Susi's message of "Tue, 17 Jan 2006 21:10:56 -0500")

Phillip Susi <psusi@cfl.rr.com> writes:

> but only slightly so, and in any case, a 3 disk raid-5 is FAR more
> reliable than a single drive, and only slightly less reliable than a
> two disk raid-1 ( though you get 3x the space for only 50% higher
> cost, so 6x cheaper cost per byte of storage ).

Actually with 3-disk RAID5 you get 2x the space of RAID1 for 1.5 x cost,
so the factor is 1.5/2 = 0.75, i.e., you save only 25% on RAID5 or RAID1
is 33% more expensive.
-- 
Krzysztof Halasa

  parent reply	other threads:[~2006-01-18 16:47 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-17 19:35 FYI: RAID5 unusably unstable through 2.6.14 Cynbe ru Taren
2006-01-17 19:39 ` Benjamin LaHaise
2006-01-17 20:13   ` Martin Drab
2006-01-17 23:39     ` Michael Loftis
2006-01-18  2:30       ` Martin Drab
2006-02-02 20:33     ` Bill Davidsen
2006-02-03  0:57       ` Martin Drab
2006-02-03  1:13         ` Martin Drab
2006-02-03 15:41         ` Phillip Susi
2006-02-03 16:13           ` Martin Drab
2006-02-03 16:38             ` Phillip Susi
2006-02-03 17:22               ` Roger Heflin
2006-02-03 19:38                 ` Phillip Susi
2006-02-03 17:51             ` Martin Drab
2006-02-03 19:10               ` Roger Heflin
2006-02-03 19:12                 ` Martin Drab
2006-02-03 19:41                   ` Phillip Susi
2006-02-03 19:45                     ` Martin Drab
2006-01-17 19:56 ` Kyle Moffett
2006-01-17 19:58 ` David R
2006-01-17 20:00 ` Kyle Moffett
2006-01-17 23:27 ` Michael Loftis
2006-01-18  0:12   ` Kyle Moffett
2006-01-18 11:24     ` Erik Mouw
2006-01-18  0:21   ` Phillip Susi
2006-01-18  0:29     ` Michael Loftis
2006-01-18  2:10       ` Phillip Susi
2006-01-18  3:01         ` Michael Loftis
2006-01-18 16:49           ` Krzysztof Halasa
2006-01-18 16:47         ` Krzysztof Halasa [this message]
2006-02-02 22:10     ` Bill Davidsen
2006-02-08 21:58       ` Pavel Machek
2006-01-18 10:54 ` Helge Hafting
2006-01-18 16:15   ` Mark Lord
2006-01-18 17:32     ` Alan Cox
2006-01-19 15:59       ` Mark Lord
2006-01-19 16:25         ` Alan Cox
2006-02-08 14:46           ` Alan Cox
2006-01-18 23:37     ` Neil Brown
2006-01-19 15:53       ` Mark Lord
2006-01-19  0:13 ` Neil Brown
2006-02-03 17:00 Salyzyn, Mark
2006-02-03 17:39 ` Martin Drab
2006-02-03 19:46 ` Phillip Susi

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