linux-kernel - Re: Linux: Why software RAID?

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Message-ID: <e9c3a7c20608261355k41692c64w9165a22a9b7fab29@mail.gmail.com>
Date:	Sat, 26 Aug 2006 13:55:36 -0700
From:	"Dan Williams" <dan.j.williams@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Chris Friesen" <cfriesen@...tel.com>,
	"Jeff Garzik" <jeff@...zik.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Linux RAID Mailing List" <linux-raid@...r.kernel.org>,
	marc@...kel.com
Subject: Re: Linux: Why software RAID?

On 8/23/06, H. Peter Anvin <hpa@...or.com> wrote:
> Chris Friesen wrote:
> > Jeff Garzik wrote:
> >
> >> But anyway, to help answer the question of hardware vs. software RAID,
> >> I wrote up a page:
> >>
> >>     http://linux.yyz.us/why-software-raid.html
> >
> > Just curious...with these guys
> > (http://www.bigfootnetworks.com/KillerOverview.aspx) putting linux on a
> > PCI NIC to allow them to bypass Windows' network stack, has anyone ever
> > considered doing "hardware" raid by using an embedded cpu running linux
> > software RAID, with battery-backed memory?
> >
> > It would theoretically allow you to remain feature-compatible by
> > downloading new kernels to your RAID card.
> >
>
> Yes.  In fact, I have been told by several RAID chip vendors that their
> customers are *strongly* demanding that their chips be able to run Linux
>   md (and still use whatever hardware offload features.)
>
> So it's happening.
Speaking of md with hardware offload features:

http://prdownloads.sourceforge.net/xscaleiop/ols_paper_2006.pdf?download

>         -hpa

Dan
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