From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Bernd Eckenfels <ecki-news2004-05@lina.inka.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux SATA RAID FAQ
Date: Sat, 14 Aug 2004 22:49:24 +0100 [thread overview]
Message-ID: <1092520163.27405.11.camel@localhost.localdomain> (raw)
In-Reply-To: <411BA940.5000300@pobox.com>
On Iau, 2004-08-12 at 18:30, Jeff Garzik wrote:
> > The SX4 has an on-board DIMM (128M - 2G), through which all data _must_
> > pass. The data transfer between host and on-board DIMM is a separate
> > DMA engine and separate interrupt event from the four ATA DMA engines
> > (one per SATA port). There are several possibilities that are worth
> > exploring on this card:
> >
> > * Caching
Is it battery backed ? If it is battery backed then its useful, if not
then it becomes less useful although not always. The i2o drivers have
some ioctls so you can turn on writeback caching even without battery
backup. While this is suicidal for filesytems its just great for swap..
next prev parent reply other threads:[~2004-08-14 22:51 UTC|newest]
Thread overview: 26+ 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 11:34 ` 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 [this message]
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
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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