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

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Date:	Tue, 05 Feb 2008 22:21:59 +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:
>>> 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.
> 
> Actually, think about those multiple connections...  we already had to 
> implement fast-failover (and load bal) SCSI multi-pathing at a higher 
> level.  IMO that portion of the protocol is redundant:   You need the 
> same capability elsewhere in the OS _anyway_, if you are to support 
> multi-pathing.

I'm thinking about MC/S as about a way to improve performance using 
several physical links. There's no other way, except MC/S, to keep 
commands processing order in that case. So, it's really valuable 
property of iSCSI, although with a limited application.

Vlad
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