Re: Framing Discussion

[Stephen Bailey <steph@cs.uchicago.edu>]

Mohan,

> So, the zero copy problem addresses a specific API model. It
> was not obvious reading the document that was sent.

It is effectively stated in the Abstract:

  The iSCSI protocol aims to be fully compliant with the requirements
  laid out in the SCSI Architecture Model - 2 [SAM2] document.

iSCSI is a `Transport Protocol' within SAM2, and this implies various
requirements, including supplied buffers per command.  iSCSI will not
make sense without a general understanding of SAM2.  Like most specs
these days, it's hard to tell which references are deep (as in, you
should read BEFORE you try to understand this), and which are shallow.
The SAM2 reference is deep, as suggested by it's prominent mention in
the abstract.

You can find a link to the latest SAM2 draft at:

  http://www.t10.org/drafts.htm

Also note that these days people tend to use the terms SAM and SAM2
interchangeably to mean SAM2.

Steph