Date: 29 Nov 2000 15:17:17 -0500 From: Nat Lanza <magus@cs.cmu.edu> To: mjacob@feral.com Cc: Tom Samplonius <tom@sdf.com>, Chuck McCrobie <mccrobi@aplcenMP.apl.jhu.edu>, freebsd-scsi@FreeBSD.ORG Subject: Re: RFC 2143 (IP over SCSI) Support in FreeBSD Message-ID: <uocwvdmy1ma.fsf@hurlame.pdl.cs.cmu.edu> In-Reply-To: Matthew Jacob's message of "Wed, 29 Nov 2000 11:43:29 -0800 (PST)" References: <Pine.LNX.4.21.0011291140160.1337-100000@zeppo.feral.com>
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Matthew Jacob <mjacob@feral.com> writes: > Yes and no. The ANSI SCSI-2 spec took years to finalize. Same for SCSI-3. If > it's a worthwhile feature, and you're dealing just with the software > instantiation, it might be worth looking at doing for early releases. iSCSI has a much more limited scope than the T10 work; one of the major goals is to get something working and standardized quickly. But yes, there is the possibility of the standardization process taking a long time. Even so, I'd much rather see an effort to implement iSCSI based on the draft IETF documents than one to implement some vendor's incompatible thing. > > Our lab is working on SCSI-over-IP, and our target platforms are FreeBSD > > and Linux. We would most likely be interested in contributing our code to > > the FreeBSD community when we're done, but it's far too early to make any > > promises. > > Can you keep us posted on this? We'd absolutely love it if CMU (d'ya > work with Garth?) did this. Sure. Also, yes, I do work with Garth. He's no longer the director of the Parallel Data Lab now that he's working on his startup, though. These days the lab's headed by Dave Nagle, who's really more involved in the iSCSI stuff. > Ah. Cool. Is this available to be looked at? Define 'decent'... It's not available yet, but I hope it will be before too long. Our lab's industry sponsorship obligations and the time constraints of paper deadlines limit when and how we can publically release code, unfortunately. A simple (~1500 line) server using the Linux SCSI generic layer to talk to a Quantum Atlas 10K can pull sequential read/write data over a Myrinet link at media speeds (25MB/sec or so), and one using a SCSI ramdisk as backing store can do at least 35-40MB/sec over Myrinet. We see slightly lower performance over gigabit ether, but we haven't spent too much time optimizing gigabit performance. This is with a simple userlevel server and kernel-level client, and no unusual hardware (well, other than the Myrinet, I guess) -- the machines involved are generic PII boxes, and we're using standard unmodified TCP and SCSI. --nat -- nat lanza --------------------- research programmer, parallel data lab, cmu scs magus@cs.cmu.edu -------------------------------- http://www.cs.cmu.edu/~magus/ there are no whole truths; all truths are half-truths -- alfred north whitehead To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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