variable CDB length

["Michael J. S. Smith (PacBell)" <smithmjs@pacbell.net>]

I'm trying to bound some of the iSCSI structures. This email is regarding
the AHS for extended CDBs.

The following (page 37 of the PDF, page 7 in the draft page numbering) is
from ftp://ftp.t10.org/t10/drafts/spc3/spc3r07.pdf. SPC-3 contains the
third-generation definition of the basic commands for all SCSI devices.
{Date: 2002/05/03, Rev: 07, Status: Development, Project: 1416-D, File:
spc3r07.pdf (2697091 bytes)} (see http://www.t10.org/drafts.htm#CMNDSETS)

[quote]

Command descriptor block (CDB): The structure used to communicate commands
from an application client to a device server. A CDB may have a fixed length
of up to 16 bytes or a variable length of between 12 and 260 bytes.

[end quote]

I can't find another reference within the 442 pages of the 07 draft of SPC-3
to the 260-byte maximum length for a variable-length CDB.

1. Is the 260-byte figure in the definitions section of the 07 draft of
SPC-3 correct?
2. Is it intended that the maximum length of ExtendedCDB field in the iSCSI
Extended CDB AHS comes from SPC-3?

I searched the mail archive and I did find a discussion between Julo and Bob
on the AHS format, but can't find a definitive answer to the last question.

Aloha

Mike Smith
CTO, iReady