SSC/SMC WG minutes, March 14 1996, San Diego, X3T10/96-149r0

Erich Oetting erich_oetting at
Mon Mar 18 14:41:38 PST 1996

* From the SCSI Reflector, posted by:
* erich_oetting at (Erich Oetting)
Minutes of SSC/SMC Working Group mtg.     X3T10/96-149 r0

San Diego, CA.

Accredited Standards Committee
X3, Information Technology

To:       Membership of X3T10

From:     Erich Oetting

Subject:  Minutes of SSC/SMC Working Group Meeting
          San Diego, CA. March 14, 1996


1. Opening Remarks

2. Approval of Agenda

3. Attendance and Membership

4. SSC Topics
4.1 - Aborting stream devices and recovery.
4.2 - Comm. devices
4.3 - Error Code Chart for Printer & Comm devices?
4.4 - Definition of Ready for Comm. devices?
4.5 - Chart of historical density codes

5. SMC Topics.
5.1 - Write Protect in Media Changers
5.2 - Reserve(10), Release(10), PRIN and PROUT in Media Changers.
5.3 - Media Changers with no Storage Elements?

6.   Other Topics
6.1 - SPC Topics relating to SSC and SMC.

7.    Meeting Schedule
8.    Adjournment

                              Results of Meeting

1.    Opening Remarks

Ted Lappin, the SSC Technical Editor, called the meeting to order at 9:00
a.m., Thursday, March 14, 1996.  He thanked Skip Jones of QLogic for
arranging and hosting the meeting.

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

The draft agenda was approved.

3.    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 organization directly and materially affected by
X3T10's scope of work.

The following people attended the meeting:

         Name       Organization        Email Address
 ---------------    -------------       -------------
Mr. Erich Oetting   Storage Technology  erich_oetting at
Mr. Edward Lappin   Exabyte Corp.       tedl at
Mr. Dan Davis       Overland Data       ddavies at
Mr. Ralph Weber     ENDL Associates     roweber at
Mr. Ken Hallam      Unisys
Mr. Peter Grossler  NSM Jukebox Gmbh    peter_grossler at

Total of 6 People Present

4.   SSC Topics

4.1 - Aborting stream devices and recovery.

      A discussion was held on how to handle aborts in stream devices.  Ted
has added language to SSC indicating that a Read Position command may be
required to establish position after an abort or reset.  The target should
attempt to clean up partial records after an abort, but may not be
successful. The block position unknown bit in Read Position might be used
to indicate that a partial record was written.  Ted will work on the
wording for SSC.

4.2 - Comm. devices

Ted asked if anyone attending had a interest in Comm devices and requested
that they review the Comm model in SSC closely. None of those attending had
anything to do with Comm. Devices.

4.3 - Error Code Chart for Printer & Comm devices?

Ted asked if anyone had any input on building an error code chart for
printer or comm devices.  He will attempt to create a chart for the next
revision of SSC.

4.4 - Definition of Ready for Comm. & Printers?

Ted asked about how to define ready for a Comm device. The current SSC
defines Ready for a printer as being able to print.  Ready for a Comm
device is defined as the device being able to accept a Send command. Peter
asked if Not Ready should indicate status of a communication link.  Ted
would like more input on this issue.

The question of how to handle a Get Message command when no data is
available.  Ted will add language to indicate that the command should just
return no data, instead of waiting.

4.5 - Chart of historical density codes

Ken Hallum asked about how to fill in the Report Supported density fields
for an existing density code.  Erich will send Ted some updated information
on existing density codes to make the table more complete.

5.    SMC Topics.

5.1 - Write protect in Media Changer Model.

Erich proposed that a Media Changer should be able to write protect media
when moving it to a transport, by setting a bit in the Move Media or
Exchange Media command.  Ted commented that some devices could implement
this using the existing write protect feature of the media.  In this case
the target must be able to retain write protect status over a power
failure.  Further discussion of this will be held via the SCSI reflector.

5.2 - Reserve(10), Release(10), PRIN and PROUT in Media Changers.

These commands to SMC's list of supported commands.  Reserve(10) and
Release(10) element reservations will need to be described in SMC.

5.3 - Media Changers with no Storage Elements?

Erich will change the model to allow Media Changer devices with no storage
elements to allow devices that only have import/export, media transport,
and data transport elements.  A stacker devices, or a device that routes
media between several media changer import/export elements.

6.   Other Topics

6.1 - SPC Topics relating to SSC and SMC.

Ralph Weber asked if ECMA and ISO should be added to the Vendor list.  We
decided that they should to allow reporting of density codes approved by
these organizations.

Erich pointed out some text in SPC clause 5.5 that should be removed as the
information is already in SMC.  Ralph will delete the last paragraph of the

Ralph also asked about the SPC definition of Information Bytes.  Ted
pointed out a couple of errors in the definition in regards to sequential
devices.  Ralph will change SPC and add a pointer to SSC for more complete

7.    Meeting Schedule

The next meeting of the SSC/SMC Working Group will be in Ft. Lauderdale FL,
hosted by Adaptec.  Actual meeting time will be determined by the X3T10

8.    Adjournment

The meeting was adjourned at 11 a.m. on Thursday Jan. 14, 1996.

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