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

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Date:	Tue, 05 Feb 2008 22:01:47 +0300
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-scsi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	scst-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: Integration of SCST in the mainstream Linux kernel

Jeff Garzik wrote:
> Alan Cox wrote:
> 
>>>better. So for example, I personally suspect that ATA-over-ethernet is way 
>>>better than some crazy SCSI-over-TCP crap, but I'm biased for simple and 
>>>low-level, and against those crazy SCSI people to begin with.
>>
>>Current ATAoE isn't. It can't support NCQ. A variant that did NCQ and IP
>>would probably trash iSCSI for latency if nothing else.
> 
> 
> AoE is truly a thing of beauty.  It has a two/three page RFC (say no more!).
> 
> But quite so...  AoE is limited to MTU size, which really hurts.  Can't 
> really do tagged queueing, etc.
> 
> 
> iSCSI is way, way too complicated. 

I fully agree. From one side, all that complexity is unavoidable for 
case of multiple connections per session, but for the regular case of 
one connection per session it must be a lot simpler.

And now think about iSER, which brings iSCSI on the whole new complexity 
level ;)

> It's an Internet protocol designed 
> by storage designers, what do you expect?
> 
> For years I have been hoping that someone will invent a simple protocol 
> (w/ strong auth) that can transit ATA and SCSI commands and responses. 
> Heck, it would be almost trivial if the kernel had a TLS/SSL implementation.
> 
> 	Jeff
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