linux-kernel - Re: Integration of SCST in the mainstream Linux kernel

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Message-Id: <1202172314.17934.161.camel@cinder.waste.org>
Date:	Mon, 04 Feb 2008 18:45:14 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vladislav Bolkhovitin <vst@...b.net>,
	Bart Van Assche <bart.vanassche@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-scsi@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mike Christie <michaelc@...wisc.edu>
Subject: Re: Integration of SCST in the mainstream Linux kernel


On Mon, 2008-02-04 at 16:24 -0800, Linus Torvalds wrote:
> 
> On Mon, 4 Feb 2008, Matt Mackall wrote:
> > 
> > But ATAoE is boring because it's not IP. Which means no routing,
> > firewalls, tunnels, congestion control, etc.
> 
> The thing is, that's often an advantage. Not just for performance.
> 
> > NBD and iSCSI (for all its hideous growths) can take advantage of these
> > things.
> 
> .. and all this could equally well be done by a simple bridging protocol 
> (completely independently of any AoE code).
> 
> The thing is, iSCSI does things at the wrong level. It *forces* people to 
> use the complex protocols, when it's a known that a lot of people don't 
> want it. 

I frankly think NBD is at a pretty comfortable level. It's internally
very simple (and hardware-agnostic). And moderately easy to do in
silicon.

But I'm not going to defend iSCSI. I worked on the first implementation
(what became the Cisco iSCSI driver) and I have no love for iSCSI at
all. It should have been (and started out as) a nearly trivial
encapsulation of SCSI over TCP much like ATA over Ethernet but quickly
lost the plot when committees got ahold of it.

-- 
Mathematics is the supreme nostalgia of our time.

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