linux-kernel - Re: [patch 4/6] ps3: Disk Storage Driver

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Message-Id: <20070615.160858.26276547.davem@davemloft.net>
Date:	Fri, 15 Jun 2007 16:08:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	James.Bottomley@...elEye.com
Cc:	alan@...rguk.ukuu.org.uk, Geert.Uytterhoeven@...ycom.com,
	dwmw2@...radead.org, axboe@...nel.dk, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	paulus@...ba.org
Subject: Re: [patch 4/6] ps3: Disk Storage Driver

From: James Bottomley <James.Bottomley@...elEye.com>
Date: Fri, 15 Jun 2007 15:40:42 -0700

> On Fri, 2007-06-15 at 14:19 -0700, David Miller wrote:
> > Another quirk I have to deal with is that under LDOMs you
> > can export full disks and also just slices.  So I'll have
> > to get down into the partition machinery to support that
> > somehow.
> 
> For this, it sounds like you might find nbd a more enticing
> proposition ... it already is partition independent and is basically a
> block to net socket exporter.

That's not gonna work, it's a totally different model.

I have a predefined protocol over hypervisor provided "channels" and
page flipping also done by the hypervisor for the bulk data transfer.
For the client side I cannot change the hypervisor nor the server
speaking on the other end.  And when I do write a server I do want
it to be able to speak to all of the existing clients.

There's SCSI command pass through as well, as I keep mentioning as
it's an important reason I don't want to go with any of the non-SCSI
solutions (other than perhaps ATA) being suggested.
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