Minutes - GWG

Larry=Lamers%ENG7%MCA at sanjose3.maxtor.com Larry=Lamers%ENG7%MCA at sanjose3.maxtor.com
Fri Jan 21 09:50:09 PST 1994


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Gentlemen - Included below are the preliminary minutes of the General Working 
Group meeting held in San Diego.

Accredited Standards Committee
X3, Information Processing Systems
                                                           Doc. No.: 
X3T10/94-013r0
                                                               Date: January 
21, 1994

                                                            Project: 
                                                          Ref. Doc.: 
                                                           Reply to: J. 
Lohmeyer

To:      Membership of X3T10

From:    Lamers/Lohmeyer

Subject:    Minutes of X3T9.2 General Working Group January 11-12, 1994


                                    Agenda
1.    Opening Remarks

2.    Attendance and Membership

3.    Approval of Agenda

4.    Physical Topics
   4.1    SCSI-3 Physical Interface (Project 855 rev 12b) [Lamers]
      4.1.1     Proposed Changes to SPI (93-149r2) [Aloisi]


5.    Protocol Topics
   5.1   SCSI-3 Architecture Model - SAM (X3T10/994D) [Monia]
   5.2   SCSI-3 Interlocked Protocol (Project 856D) [Lamers]
   5.3   SCSI-3 Generic Packetized Protocol (Project 991D) [Stephens]
   5.4   SCSI-3 Serial Bus Protocol (Project 992D) [Lamers]
   5.5   SCSI-3 Fibre Channel Protocol (Project 993D) [Snively]

6.    Command Set Topics
   6.1   SCSI-3 Block Commands (Project 996D) []
   6.2   SCSI-3 Stream Commands (Project 997D) [Stephens]
   6.3   SCSI-3 Graphics Commands (Project 998D) [Stephens]
   6.4   SCSI-3 Medium Changer Commands (Project 999D) [Stephens]

7.    General Working Group Items
   7.1   Ultra-SCSI () [Ham]
   7.2   RAID (94-xxxr0) [Penokie]
   7.3   PnP SCSI () [Lohmeyer]
   7.4   Message Handling (93-184r1) [Houlder]
   7.5   Multi-Media Project Proposal (93-178r0) [Harris]

8.    Meeting Schedule

9.    Adjournment

                              Results of Meeting

1.    Opening Remarks

John Lohmeyer the Chair, called the meeting to order at 9:00 a.m., Tuesday,
January 11, 1994.  He thanked Vitro for hosting the meeting.

As is customary, the people attending introduced themselves.  A copy of the
attendance list was circulated for attendance and corrections.

It was stated that the meeting had been authorized by X3T10 and would be
conducted under the X3 rules.  Ad hoc meetings take no final actions, but
prepare recommendations for approval by the X3T10 task group.  The voting
rules for the meeting are those of the parent committee, X3T10.  These rules
are:  one vote per company; and any participating company member may vote.

The minutes of this meeting will be posted to the SCSI BBS and the SCSI
Reflector and will be included in the next committee mailing.

John noted that X3.131 had passed the X3 letter ballot and was at ANSI for
compliance review.
He also stated that OMC had recommended that X3T10 be established and an
accelerated letter ballot will be done.

2.    Attendance and Membership

Attendance at working group meetings does not count toward minimum attendance
requirements for X3T10 membership.  Working group meetings are open to any
person or company to attend and to express their opinion on the subjects
being discussed.

The following people attended the meeting:

                X3T10 General Working Group Meeting Attenders

         Name          S       Organization         Electronic Mail Address
---------------------- - ------------------------- -------------------------
45 people present

Status Key:  P   -  Principal
             A   -  Alternate
             O   -  Observer
             L   -  Liaison
             S,V -  Visitor



3.    Approval of Agenda

The proposed agenda was approved.

4.    Physical Topics

4.1    SCSI-3 Physical Interface (Project 855 rev 12b) [Lamers]

SPI is at public review.  The public review closes on February 22, 1994.  The
pre-edit has been completed by the ANSI editor and a markup returned to the
Project Editor.

4.1.1    Proposed Changes to SPI (93-149r2) [Aloisi]

Paul Aloisi stated that the capacitor to decouple the low frequency in the
terminator needs limits to prevent glitches during hot plugging.

Bill Galoway pointed out that turned off switchable terminators need a
capacitance limit to prevent excessive current at power-on.

Bob Snively pointed out that in Figure 10 of SCSI-2 a 10 uf capacitor is
specified for the Boulay terminator.  This is an issue for devices that use
a removable terminator pack and leave the regulator and capacitor on the
device.

A maximum of 5 uf was proposed for devices that are not terminating the bus
and a maximum of 50 uf for ones that are.

All persons are charged (to what level depends on their capacitance) with
investigating their implementations and providing information on what the
limits should be at the next meeting.

Paul also noted recommended changes to Annex G to add a clause on glitching
restrictions.  Active termination is required for hot-swap units.

Items 4 and 5 of Paul's proposal have already been thrashed through several
times and not accepted.

5.    Protocol Topics


5.1   SCSI-3 Architecture Model - SAM (Project 994D) [Monia]

Charles Monia went throught several issues on SAM.

Autosense is allowed but cannot be relied on.

Queuing is optional but the messages must be rejected appriately to avoid
hanging the bus.

Task set - each task set basis has properties - Annex A disposition?  Needs
to be determined this week.

Currently SAM does not specifically allow alternative task set basis
definition.

Should all CDB's be limited to 16-bbytes? Yes.

Bit significance in status byte - will be eliminated and encoded status.

Should duplicate nexus checking be required? No - but if detected the
reporting mechanism is specified.

Must the service delivery subsystem preserve tansaction ordering - The only
thing that matters is order of arrival at the peripheral.

Transaction ordering is not required to be preserved.  If a driver wants to
have ordered delivery it must take the appropriate steps to do so - using
synchronized transactions.

Is an entity allowed to have more than one address?  No specified.

Should a CLEAR ACA while an ACA is in effect unconditionally abort a task in
the enabled state?

Can more than task management function exist per I_T_L?

5.2   SCSI-3 Interlocked Protocol (Project 856D) [Lamers]


5.3   SCSI-3 Generic Packetized Protocol (Project 991D) [Stephens]


5.4   SCSI-3 Serial Bus Protocol (Project 992D) [Lamers]


5.5   SCSI-3 Fibre Channel Protocol (Project 993D) [Snively]

Bob Snively reviewed the proposed responses to the letter ballot comments on
FCP (see 94-014).  He plans to incorporate these responses in a revision 8
document.

6.    Command Set Topics

6.1   SCSI-3 Block Commands (Project 996D) []

6.2   SCSI-3 Stream Commands (Project 997D) [Stephens]

6.3   SCSI-3 Graphics Commands (Project 998D) [Stephens]

6.4   SCSI-3 Medium Changer Commands (Project 999D) [Stephens]

7.    General Working Group Items

7.1   Ultra-SCSI (X3T10/94-023r0) [Ham]

Bill Ham presented test data on a 40 Mb/sec transfer rate differential SCSI.
TI is planning to manufacture a 9-channel transceiver in Q2 94 that supports
these data rates.

Data on s/e being gathered.

Concerns from the group:
   -multiple stubs (up to 16)
   -research old worst case configurations
   -different cable type
   -stub concentrations
   -drivers not near the terminators
   -forced temperature difference
   -forced difference in transceivers

7.2   RAID (94-031r0) [Penokie]

George presented a proposal for extended logical unit addressing for use with
SCA command set devices.

7.3   PnP SCSI () [Lohmeyer]

Revision 0.97 has been completed incorporating the results of last weeks
meeting in Colo Spgs, CO.  The document is on the SCSI BBS and on Compuserve.

7.4   Message Handling (94-032r0) [Houlder]

Gerry Houlder presented a chart that details message sequences and allowed
responses.  In several cases SCSI-2 does not provide a clear response
sequence when an error occurs.

Gerry would like to see this document become an informative annex in SIP.

7.5   Multi-Media Project Proposal (X3T9.2/93-178r0) [Harris]

Norm Harris, technical editor of MMC, reported that an initial proposal for
a working draft is completed.  It is based on the existing chapter 14 of
SCSI-2.  It is focused on CD-ROM devices at this time but is likely to
encompase other multimedia devices.  Items that need to be worked on include
an update for CD-XA, multisession, CD-R, CD-I, photo CD. attenuation level
control, and command modifications.

A working group meeting is planned for late February '94.  Contact Norm
Harris. (nharris at adaptec.com) TEL: 408-945-8600.

8.    Meeting Schedule

The next working group meetings will be March 13-18, 1994 at the Hyatt
Newporter Hotel (714-729-1234) in Newport Beach, CA hosted by Qlogic
Corporation.  The room rates are $99.00 including tax.  The reservation
deadline for these rates is February 1, 1994.  The group name is X3T10.  The
host contact is Skip Jones at TEL: 714-688-5058, FAX: 714-688-5008,
(s_jones at qlc.com).

9.    Adjournment

The meeting was adjourned at 4:00 p.m. on Wednesday January 11, 1994.





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