RE: new iSCSI draft - 02.txt

[julian_satran@il.ibm.com]

David,

Several of us thought that we have to have a framing solution in the
current draft and since the TCP option
(flag, length etc>) got a thumbs down at the last IETF and since in-stream
and out-of-stream solution that could be used by others (like the chunking
or my IPV6-like proposal) will take a long time to get through the process
and mature we where left with two options:

   the marker
   having a padding mechanism that will insure that at certain boundaries
   there is always a PDU boundary


I felt that the marker is preferable due to several reasons:

   It can be implemented "underneath" iSCSI - at the boundary with TCP; the
   iSCSI code (its main part) will be unaware of it and it can be replaced
   by another mechanism when such a mechanism becomes available
   it wastes less than the padding
   it is easy to implement in software and even in a plain vanilla TCP/IP
   adapter with hardware assists (and it can be used by many protocols)

We had a "low key" consensus that this is a decent solution and even Doug
Otis does not object!

And yes - we can discuss at any length in Orlando.

Regards,
Julo

"David Peterson" <dap@cisco.com> on 03/01/2001 16:47:07

Please respond to "David Peterson" <dap@cisco.com>

To:   "Ips@Ece. Cmu. Edu" <ips@ece.cmu.edu>
cc:
Subject:  RE: new iSCSI draft - 02.txt




I believe there was agreement to remove the Urgent-Pointer framing
mechanism
but don't recall any agreement to replace it with an in-stream marker. For
a
software implementation it would be hard to support this type of framing
mechanism. I believe a TCP option indicating the message boundry or a
fixed-length PDU at a granularity to minimize overhead are much better
solutions and are workable for both software and hardware implementations.
I
have not seen an agenda but I would hope this issue would be discussed at
the upcoming meeting in Orlando.
Dave

-----Original Message-----
From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
julian_satran@il.ibm.com
Sent: Saturday, December 30, 2000 11:11 AM
To: ips@ece.cmu.edu
Subject: new iSCSI draft - 02.txt






Dear colleagues,

I've just submitted to the Internet-Drafts repository and to our list
archive (at CMU) a new
version of the draft.

Changes (from 2b!):

   framing by Urgent-Pointer replaced by framing through in-stream marker
   editorials and typos (not completed yet)
   simpler digests
   digest recovery and some clarifications on iSCSI specific errors (more
   to come)


I will have version 03 with many more editorial changes before the
intermediate meeting.

You can see the draft at:

http://www.haifa.il.ibm.com/satran/draft-ietf-ips-iSCSI-02.txt

Regards,
Julo