From: jw schultz <jw@pegasys.ws>
To: linux-kernel@vger.kernel.org
Subject: Re: RAID-6 support in kernel?
Date: Tue, 4 Jun 2002 19:51:13 -0700 [thread overview]
Message-ID: <20020604195113.G7742@pegasys.ws> (raw)
In-Reply-To: <Pine.LNX.4.33.0206031020290.30424-100000@mail.pronto.tv> <Pine.GSO.4.21.0206030213510.23709-100000@gecko.roadtoad.net> <20020603113128.C13204@ucw.cz>
On Mon, Jun 03, 2002 at 11:31:28AM +0200, Vojtech Pavlik wrote:
> On Mon, Jun 03, 2002 at 02:25:22AM -0700, Derek Vadala wrote:
>
> He was thinking "mirror", not "stripe". Mirror of 2 RAID-5 arrays (would
> be probably called RAID-15 (when there is a RAID-10 for mirrored stripe
> arrays)), can withstand any two disks failing anytime. Even more for
> certain combinations. But it is terribly inefficient.
All the authoritative literature says that
RAID-10 is striped mirrors (survive ~1/n 2 disk failures.)
RAID-0+1 is mirrored stripes (survive ~1/2 2 disk failures.)
What he is describing would be RAID-5+1, mirrored RAID-5s.
RAID-15 would be a RAID-5 of mirrors.
Both of these could survive any 3 disk failures.
--
________________________________________________________________
J.W. Schultz Pegasystems Technologies
email address: jw@pegasys.ws
Remember Cernan and Schmitt
next prev parent reply other threads:[~2002-06-05 2:51 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 [this message]
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
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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