From: Mike Fedyk <mfedyk@matchmail.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Peter Zaitsev <peter@mysql.com>,
Helge Hafting <helgehaf@aitel.hist.no>,
jw schultz <jw@pegasys.ws>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: raid0 slower than devices it is assembled of?
Date: Wed, 17 Dec 2003 10:37:39 -0800 [thread overview]
Message-ID: <20031217183739.GG1402@matchmail.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0312170758220.8541@home.osdl.org>
On Wed, Dec 17, 2003 at 08:01:13AM -0800, Linus Torvalds wrote:
> However, since seeking will be limited by the checksum drive anyway (for
> writing), the advantages of large stripes in trying to keep the disks
> independent aren't as one-sided.
It seems to me that you are referring to a single pairity drive in the
array. That is raid4, where only one drive handles the pairity data for the
entire array regardless of array size.
Raid5 staggers the pairidy data (md has four different staggering layouts)
so that the data, and pairity are on two different drives, and that varies
based on stripe and layout.
next prev parent reply other threads:[~2003-12-17 18:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-15 13:34 raid0 slower than devices it is assembled of? Witold Krecicki
2003-12-15 15:44 ` Witold Krecicki
2003-12-16 4:01 ` jw schultz
2003-12-16 14:51 ` Helge Hafting
2003-12-16 16:42 ` Linus Torvalds
2003-12-16 20:58 ` Mike Fedyk
2003-12-16 21:11 ` Linus Torvalds
2003-12-17 10:53 ` Jörn Engel
2003-12-17 11:39 ` Peter Zaitsev
2003-12-17 16:01 ` Linus Torvalds
2003-12-17 18:37 ` Mike Fedyk [this message]
2003-12-17 21:55 ` bill davidsen
2003-12-17 17:02 ` bill davidsen
2003-12-17 20:14 ` Peter Zaitsev
2003-12-17 19:22 ` Jamie Lokier
2003-12-17 19:40 ` Linus Torvalds
2003-12-17 22:36 ` bill davidsen
2003-12-18 2:47 ` jw schultz
2003-12-17 22:29 ` bill davidsen
2003-12-18 2:18 ` jw schultz
2004-01-08 4:54 ` Greg Stark
2003-12-16 20:51 ` Andre Hedrick
2003-12-16 21:04 ` Andre Hedrick
2003-12-16 21:46 ` Witold Krecicki
2003-12-16 20:09 ` Witold Krecicki
2003-12-16 21:11 ` Adam Kropelin
2003-12-16 21:25 ` jw schultz
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