From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "J. Ryan Earl" <heretic@clanhk.org>
Cc: Willy Tarreau <willy@w.ods.org>, Jeff Garzik <jgarzik@pobox.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>
Subject: Re: Linux SATA RAID FAQ
Date: Sat, 14 Aug 2004 16:21:53 +0100 [thread overview]
Message-ID: <1092496912.27156.6.camel@localhost.localdomain> (raw)
In-Reply-To: <411D5D70.9070909@clanhk.org>
On Sad, 2004-08-14 at 01:31, J. Ryan Earl wrote:
> On the brightside, md raid5 is often faster than hardware raid5. At
> least on the 7000 and 8000 series of 3ware hardware; the 9000 series
> looks promising though. I haven't seen megaraid SATA numbers, and I
> don't know what happened to the SX8.
Be cautious what you measure. One of he problems until you reach PCI-X
is PCI bandwidth. Thus software md5 can look good but the moment its
combined with other PCI activity goes down the pan entirely.
> When the libata Marvell drivers come out, you'll have a cheap upgrade
> path for PCI-X boards if you want fast md raid:
Agreed. PCI-X will change a lot of this for boxes that are not very
cpu/memory limited.
next prev parent reply other threads:[~2004-08-14 16:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-12 6:33 Linux SATA RAID FAQ Jeff Garzik
2004-08-12 7:18 ` Michael Knigge
2004-08-12 11:17 ` Paul Ionescu
2004-08-12 11:17 ` Paul Ionescu
2004-08-12 11:34 ` Willy Tarreau
2004-08-12 13:38 ` Bernd Eckenfels
2004-08-12 12:56 ` Alan Cox
2004-08-12 17:23 ` Jeff Garzik
2004-08-12 17:30 ` Jeff Garzik
2004-08-14 21:49 ` Alan Cox
2004-08-14 22:56 ` Jeff Garzik
2004-08-15 20:54 ` Xavier Bestel
2004-08-15 20:51 ` Alan Cox
2004-08-15 22:02 ` Bernd Eckenfels
2004-08-15 21:42 ` Jakob Oestergaard
2004-08-16 22:06 ` Andrew Morton
2004-08-16 21:58 ` Alan Cox
2004-08-16 22:10 ` Christoph Hellwig
2004-08-12 14:01 ` Alistair John Strachan
2004-08-14 0:31 ` J. Ryan Earl
2004-08-14 3:17 ` Mark Lord
2004-08-14 6:37 ` age huisman
2004-08-14 11:03 ` Mark Lord
2004-08-14 15:21 ` Alan Cox [this message]
2004-08-14 22:28 ` J. Ryan Earl
2004-08-12 18:09 ` Martin Schlemmer
-- strict thread matches above, loose matches on Subject: below --
2004-08-12 13:46 Dieter Stueken
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