RE: IETF mailing list question on Storage over Ethernet/IP

[Dave Nagle <bassoon@yogi.ece.cmu.edu>]

Date:    Fri, 26 May 2000 09:43:56 -0500
From:    "Don Woelz" <don@genroco.com>
To:      "Dave Nagle" <bassoon@yogi.ece.cmu.edu>,
	 "SCSI-over-TCP List" <scsi-tcp@external.cisco.com>
Subject: RE: IETF mailing list question on Storage over Ethernet/IP

> > 2.  Adaptec has posited a replacement for TCP called STP for use as a
> > transport for storage.  Does anyone know anything about this?
> 
> STP is the Scheduled Transfer protocol being standardized by the ANSI T11
> folks.  ST was designed to run on top of GSN (a.k.a. HIPPI-6400). In my
> opinion, it is as heavy-weight as TCP with respect to most of the things
> stated above.  It does have the potential advantage of being designed from
> scratch to support zero-copy access to user space using specialized
> interface cards.

I believe Adaptec's entry is called SEP.

Dave,

I'd like to clarify your STP comments.  STP runs on top of 10Base-T, 100Base-T,
Gigabit Ethernet, HIPPI-800, GSN, and will probably be mapped to more physical
variants in the near future.  It was designed for GSN only because a more efficient
protocol was required to run at GSN speeds.  It was designed to be used on almost
any network media.  Although a very rich protocol, it is also quite performant
with very low latency and high bandwidth characteristics while maintaining low
CPU overhead.

Interestingly, STP can be transported on IP... 

There is also a draft ANSI standard for mapping SCSI on Scheduled Transfer
called SST.  The most recent copy can be found at http://www.t10.org/drafts.htm.
SST has a demonstrated ability to transfer storage data on a GSN
link at close to 720 megaBYTES per second.  Data rates approaching
those of Fibre Channel have been obtained running SST on GigE.

Don

Donald D. Woelz                 
Vice Chair of ANSI T11.1
GENROCO, Inc.
255 Info Hwy
Slinger, WI 53086
Tel: 262-644-2505

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