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

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Date:	Thu, 31 Jan 2008 18:40:59 +0100
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	"Vladislav Bolkhovitin" <vst@...b.net>,
	"FUJITA Tomonori" <tomof@....org>, fujita.tomonori@....ntt.co.jp,
	rdreier@...co.com, James.Bottomley@...senpartnership.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-scsi@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: Integration of SCST in the mainstream Linux kernel

On Jan 31, 2008 6:14 PM, Nicholas A. Bellinger <nab@...ux-iscsi.org> wrote:
> Also, with STGT being a pretty new design which has not undergone alot
> of optimization, perhaps profiling both pieces of code against similar
> tests would give us a better idea of where userspace bottlenecks reside.
> Also, the overhead involved with traditional iSCSI for bulk IO from
> kernel / userspace would also be a key concern for a much larger set of
> users, as iSER and SRP on IB is a pretty small userbase and will
> probably remain small for the near future.

Two important trends in data center technology are server
consolidation and storage consolidation. A.o. every web hosting
company can profit from a fast storage solution. I wouldn't call this
a small user base.

Regarding iSER and SRP on IB: InfiniBand is today the most economic
solution for a fast storage network. I do not know which technology
will be the most popular for storage consolidation within a few years
-- this can be SRP, iSER, IPoIB + SDP, FCoE (Fibre Channel over
Ethernet) or maybe yet another technology. No matter which technology
becomes the most popular for storage applications, there will be a
need for high-performance storage software.

References:
* Michael Feldman, Battle of the Network Fabrics, HPCwire, December
2006, http://www.hpcwire.com/hpc/1145060.html
* NetApp, Reducing Data Center Power Consumption Through Efficient
Storage, February 2007,
http://www.netapp.com/ftp/wp-reducing-datacenter-power-consumption.pdf

Bart Van Assche.
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