From: Kasper Dupont <kasperd@daimi.au.dk>
To: Derek Vadala <derek@cynicism.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-raid@vger.kernel.org
Subject: Re: RAID-6 support in kernel?
Date: Thu, 06 Jun 2002 10:28:28 +0200 [thread overview]
Message-ID: <3CFF1D2C.5861132C@daimi.au.dk> (raw)
In-Reply-To: <Pine.GSO.4.21.0206051716530.16571-100000@gecko.roadtoad.net>
Derek Vadala wrote:
>
> RAID-1 --------> RAID-5 (D0,D1,D2,D3,P0)
> |--> RAID-5 (D0,D1,D2,D3,P0)
> (four disks used for data, only one from each RAID-5 can fail)
Wrong, any three disks can fail. If the one RAID has only
one faulty disk, the other RAID can have any number of
faulty disks without loosing data.
>
> With RAID-10:
>
> RAID-0 --------> RAID-1 (D0,D0)
> |--> RAID-1 (D1,D1)
> |--> RAID-1 (D2,D2)
> |--> RAID-1 (D3,D3)
> |--> RAID-1 (D4,D4)
> (five disks used for data, one from each mirror can fail)
>
> With RAID-50:
>
> RAID-0 --------> RAID-5 (D0,D2,D4,D6,P0)
> |--> RAID-5 (D1,D3,D5,D7,P0)
>
> (two disks wasted only one from each RAID-5 can fail)
>
> I believe that I/O performance would be similar for each
> configuration. I'll try to run some tests in the next few days.
I'd guess that depends on the access patterns.
--
Kasper Dupont -- der bruger for meget tid på usenet.
For sending spam use mailto:razor-report@daimi.au.dk
next prev parent reply other threads:[~2002-06-06 8:28 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 [this message]
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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