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

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Date:	Mon, 4 Feb 2008 16:24:33 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
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, 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. 

Which is why these AoE and FCoE things keep popping up. 

It's easy to bridge ethernet and add a new layer on top of AoE if you need 
it. In comparison, it's *impossible* to remove an unnecessary layer from 
iSCSI.

This is why "simple and low-level is good". It's always possible to build 
on top of low-level protocols, while it's generally never possible to 
simplify overly complex ones.

		Linus
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