From: Carlo Wood <carlo@alinoe.com>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
Arjan van de Ven <arjan@infradead.org>,
Jeff Garzik <jeff@garzik.org>,
linux-kernel@vger.kernel.org
Subject: Re: SATA Harddisk speed drop of 100 MB/s
Date: Mon, 25 Jun 2007 18:04:12 +0200 [thread overview]
Message-ID: <20070625160412.GB2432@alinoe.com> (raw)
In-Reply-To: <20070625151841.GK10008@csclub.uwaterloo.ca>
On Mon, Jun 25, 2007 at 11:18:41AM -0400, Lennart Sorensen wrote:
> How do you know 165MB/s is correct?
It is the maximum value I measure. It's also the value that I
measure consistently with NCQ off, like with 2.6.18. Finally,
even before I bought this PC, I did some research and the RAID
with Raptors was recommended by someone with a lot of experience
with them. He told me that I could count on (N - 1) * 75 MB/s
(on average) for an array with N disks. I had expected 150 MB/s,
which is about what I get. The 165 MB/s is on the outside
of the disk (low partition).
--
Carlo Wood <carlo@alinoe.com>
next prev parent reply other threads:[~2007-06-25 16:04 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-20 22:48 SATA Harddisk speed drop of 100 MB/s Carlo Wood
2007-06-20 23:06 ` Jeff Garzik
2007-06-21 3:36 ` Arjan van de Ven
2007-06-22 16:21 ` Carlo Wood
2007-06-22 21:17 ` Henrique de Moraes Holschuh
2007-06-22 21:27 ` Carlo Wood
2007-06-23 1:31 ` Henrique de Moraes Holschuh
2007-06-23 2:59 ` Carlo Wood
2007-06-23 17:29 ` Andrew Morton
2007-06-23 22:21 ` Jeff Garzik
2007-06-25 15:18 ` Lennart Sorensen
2007-06-25 16:04 ` Carlo Wood [this message]
2007-06-22 21:44 ` SATA RAID5 " Carlo Wood
2007-06-23 3:54 ` Carlo Wood
2007-06-23 6:22 ` Tejun Heo
2007-06-22 21:48 ` Carlo Wood
2007-06-23 7:03 ` Jeff Garzik
2007-06-23 7:54 ` Tejun Heo
2007-06-23 12:53 ` Carlo Wood
2007-06-23 17:30 ` Bartlomiej Zolnierkiewicz
2007-06-23 22:43 ` Jeff Garzik
2007-06-24 11:58 ` Michael Tokarev
2007-06-24 12:59 ` Dr. David Alan Gilbert
2007-06-24 14:21 ` Justin Piszcz
2007-06-24 15:52 ` Michael Tokarev
2007-06-24 16:59 ` Justin Piszcz
2007-06-24 22:07 ` Carlo Wood
2007-06-24 23:46 ` Mark Lord
2007-06-25 0:23 ` Patrick Mau
2007-06-24 15:48 ` Michael Tokarev
2007-07-05 22:12 ` Phillip Susi
2007-06-24 0:54 ` Eyal Lebedinsky
-- strict thread matches above, loose matches on Subject: below --
2007-06-23 5:26 SATA Harddisk " Al Boldi
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