From: Allan Sandfeld <linux@sneulv.dk>
To: Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: Re: RAID-6 support in kernel?
Date: Tue, 4 Jun 2002 13:11:03 +0200 [thread overview]
Message-ID: <200206041311.03631.linux@sneulv.dk> (raw)
In-Reply-To: <Pine.LNX.4.33.0206031025400.30424-100000@mail.pronto.tv> <3CFB2F92.34D174C3@daimi.au.dk>
On Monday 03 June 2002 10:57, Kasper Dupont wrote:
> Roy Sigurd Karlsbakk wrote:
> > > > RAID-6 layout: http://www.acnc.com/04_01_06.html
> > >
> > > If it is supposed to survive two arbitrary disk failures something is
> > > wrong with that figure. They store 12 logical sectors in 20 physical
> > > sectors across 4 drives. With two lost disks there are 10 physical
> > > sectors left from which we want to reconstruct 12 logical sectors.
> > > That is impossible.
> >
> > Might be the diagram is wrong.
>
> Could be the case, so until I find another description I will
> still not know how RAID-6 works.
>
It's not just the diagram, the theory is wrong. You need to use at least log2
n+1 disks for partition if you want to handle any two lost/borked disks. (16
disks would give 11x diskspace).
next prev parent reply other threads:[~2002-06-04 11:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-02 23:01 RAID-6 support in kernel? Roy Sigurd Karlsbakk
2002-06-03 0:33 ` Derek Vadala
2002-06-03 8:24 ` Roy Sigurd Karlsbakk
2002-06-03 9:25 ` Derek Vadala
2002-06-03 9:31 ` Vojtech Pavlik
2002-06-03 14:52 ` Kasper Dupont
2002-06-03 14:55 ` Vojtech Pavlik
2002-06-04 12:49 ` Roy Sigurd Karlsbakk
2002-06-04 15:49 ` Pavel Machek
2002-06-04 22:27 ` Kasper Dupont
2002-06-05 9:36 ` Roy Sigurd Karlsbakk
2002-06-05 9:28 ` Roy Sigurd Karlsbakk
2002-06-05 2:51 ` jw schultz
2002-06-04 18:50 ` Bill Davidsen
2002-06-06 1:19 ` Derek Vadala
2002-06-06 8:28 ` Kasper Dupont
2002-06-03 7:35 ` Kasper Dupont
2002-06-03 8:28 ` Roy Sigurd Karlsbakk
2002-06-03 8:57 ` Kasper Dupont
2002-06-04 11:11 ` Allan Sandfeld [this message]
2002-06-04 12:51 ` Kasper Dupont
2002-06-04 13:58 ` Allan Sandfeld
2002-06-12 8:13 ` Kasper Dupont
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