From: Stan Hoeppner <stan@hardwarefreak.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: linux-raid@vger.kernel.org
Subject: Re: Suboptimal raid6 linear read speed
Date: Sat, 19 Jan 2013 16:48:56 -0600 [thread overview]
Message-ID: <50FB22D8.5000803@hardwarefreak.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1301190838440.12098@uplift.swm.pp.se>
On 1/19/2013 1:43 AM, Mikael Abrahamsson wrote:
> With a BER of 10^-14 you have a 16% risk of getting URE when reading an
> entire 2TB drive.
On 1/19/2013 7:21 AM, Roy Sigurd Karlsbakk wrote:
> ok, perhaps, maybe, but then it's 17% chance of losing data after a
> mirror or raid-5 rebuild with 2TB drives...
Where are you guys coming up with this 16-17% chance of URE on any
single full read of this 2TB, 10E14 drive? The URE rate here is 1 bit
for every 12.5 trillion bytes. Thus, statistically, one must read this
drive more than 6 times to encounter a URE. Given that, how is any
single full read between the 1st and the 6th going to have a 16-17%
chance of encountering a URE for that one full read? That doesn't make
sense.
--
Stan
next prev parent reply other threads:[~2013-01-19 22:48 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-15 12:33 Suboptimal raid6 linear read speed Peter Rabbitson
2013-01-15 12:45 ` Mikael Abrahamsson
2013-01-15 12:56 ` Peter Rabbitson
2013-01-15 16:13 ` Mikael Abrahamsson
2013-01-15 12:49 ` Phil Turmel
2013-01-15 12:55 ` Peter Rabbitson
2013-01-15 17:09 ` Charles Polisher
2013-01-15 19:57 ` keld
2013-01-16 4:43 ` Charles Polisher
2013-01-16 6:37 ` Tommy Apel Hansen
2013-01-16 9:36 ` keld
2013-01-16 16:09 ` Charles Polisher
2013-01-16 20:40 ` EJ Vincent
2013-01-15 23:17 ` Phil Turmel
2013-01-16 2:48 ` Stan Hoeppner
2013-01-16 2:58 ` Peter Rabbitson
2013-01-16 20:29 ` Stan Hoeppner
2013-01-16 21:20 ` Roy Sigurd Karlsbakk
2013-01-17 15:51 ` Mikael Abrahamsson
2013-01-18 8:31 ` Stan Hoeppner
2013-01-18 9:18 ` Mikael Abrahamsson
2013-01-18 22:56 ` Stan Hoeppner
2013-01-19 7:43 ` Mikael Abrahamsson
2013-01-19 22:48 ` Stan Hoeppner [this message]
2013-01-19 23:51 ` Maarten
2013-01-20 0:16 ` Chris Murphy
2013-01-20 0:49 ` Maarten
2013-01-20 1:37 ` Phil Turmel
2013-01-20 9:44 ` Chris Murphy
2013-01-20 6:26 ` Mikael Abrahamsson
2013-01-20 9:39 ` Chris Murphy
2013-01-20 16:55 ` Mikael Abrahamsson
2013-01-20 17:15 ` Chris Murphy
2013-01-20 17:17 ` Mikael Abrahamsson
2013-01-20 17:20 ` Chris Murphy
2013-01-19 23:53 ` Phil Turmel
2013-01-20 9:04 ` Wolfgang Denk
2013-01-20 19:28 ` Peter Grandi
2013-01-20 21:09 ` Mikael Abrahamsson
2013-01-20 21:50 ` Peter Grandi
2013-01-21 5:24 ` Mikael Abrahamsson
2013-01-21 14:40 ` Peter Rabbitson
2013-01-21 20:32 ` Peter Grandi
2013-01-21 20:55 ` Peter Grandi
2013-01-21 22:00 ` Peter Grandi
2013-01-19 13:21 ` Roy Sigurd Karlsbakk
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