Minutes of SSC/SMC meeting 7/13/95

Erich Oetting erich_oetting at stortek.com
Thu Jul 13 22:14:24 PDT 1995

Minutes of SSC/SMC Working Group mtg.                                       =
          X3T10/95-284 r0
Colorado Springs, CO.=20

Accredited Standards Committee
X3, Information Technology

To:         Membership of X3T10

=46rom:       Erich Oetting

Subject:     Minutes of SSC/SMC Working Group Meeting
                    Colorado Springs,CO.  July 13, 1995


1. Opening Remarks

2. Approval of Agenda

3. Attendance and Membership

4. SSC Topics
4.1 - Existing Density codes.
4.2 - Density Support command (X3T10/95-224r4)
4.3 - Initiator controlled write protect.  (X3T10/95-134r0)
4.4 - Flushing the write buffer. =20
4.5 - Log Sense Data.
4.6 - Locate to an invalid block.
4.7 - Compression identifiers in SSC Table 30.
4.8 - Medium Type Field in Mode Sense Header.
4.9 - Are setmarks and filemarks counted as blocks?
4.10 - Tape Capacity page.
4.11 - Device Capabilities page.

5. SMC Topics.
5.1 - Attached Medium Changer.
5.2 - SMC document status.

6.   Other Topics
7.    Meeting Schedule
8.    Adjournment

                              Results of Meeting

1.    Opening Remarks

Ted Lappin, the SSC Technical Editor, called the meeting to order at 9:25 a.=
Thursday, July 13, 1995.  He thanked John Loymeyer of Symbios Logic for=
 arranging and hosting the meeting.

As is customary, the people attending introduced themselves and a copy of=20
the attendance list was circulated.

The draft agenda was approved.

3.    Attendance and Membership

 Attendance at working group meetings does not count toward minimum=20
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                     S  Organization           Email Address
----------------------  --  ---------------------  -------------    =20
Mr. Erich Oetting        P  Storage Technology     erich_oetting at stortek.com
Mr. Alan Olson              3M                     arolson at mmm.com          =
Mr. Al Pease                Buslogic               alp at buslogic.com         =
Mr. Roger Cummings       A  Storage Technology     roger_cummings at stortek.co=
Mr. Arlan Stone             Unisys                 arlan.stone at mv.unisys.com=
Mr. Paul Entzel             Conner                 paul.entzel at conner.com   =
Mr. Edward Lappin        P  Exabyte Corp.          tedl at exabyte.com
Mr. Ralph Weber             ENDL Associates        roweber at acm.org
Mr. Lansing Sloan           LLNL                   ljsloan at llnl.gov
Mr. Peter Gossler        P  NSM Jukebox GmbH       73503,3467 at compuserve.com

10 People Present

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

4.   SSC Topics

4.1 - Existing Density codes.

Roger Cummings passed out a list of know tape format standards from X3B5 for=
 the group to review.  This list will be included in the next mailing after=
 a suitable disclaimer is added.

Paul Entzel brought a list of corrections to the QIC density codes in table=
 26.  This will also be included in the mailing.

4.2 - Density Support command (X3T10/95-224r4)

Ted went over his Report Density Support command proposal.  He wants to make=
 this command mandatory for SCSI-3 tape devices, and move the current=
 density code table to an historical annex.  Ralph suggested several minor=
 wording changes to clarify the document and comply with SAM terminology.=
 Ted and Ralph will continue this work later.=20

It was decided that tape capacity should return the capacity of the=
 currently mounted tape if the Media bit is set in the command, and the=
 maximum tape capacity if the Media bit is clear.=20

4.3 - Initiator controlled write protect.  (X3T10/95-134r0)

Alan Stone had a couple of questions about the soft write protect proposal.

4.4 - Flushing the write buffer. =20

Alan Stone pointed out that some commands do not specify that all write data=
 in the buffer must be written to tape before proceeding with the command. =
 Ted will look over the SSC commands for other places were this should be re=

4.5 - Log Sense Data.

Possible additions to Log Sense data for tape devices were discussed.  Alan=
 will write up a proposal for reporting tape cleaning and compression ratio=

4.6 - Locate to an invalid block.

How to handle a locate to a block that does not exist was discussed.  A=
 locate to just past the last block on tape should return good status.  A=
 locate for a position past EOD that stops at EOD should return BLANK CHECK,=
 EOD DETECTED set the valid bit and information bytes. If the locate gets=
 lost, it should return MEDIUM ERROR and an appropriate ASC/ASCQ.

4.7 - Compression identifiers in SSC Table 30.

Paul asked about including additional compression codes.  He will submit a=
 formal proposal later.

4.8 - Medium Type Field in Mode Sense Header.

This field will be made vendor unique instead of reserved to allow for=
 current QIC practice.

4.9 - Are setmarks and filemarks counted as blocks?

It was decided that Locate and Read Position should count setmarks and=
 filemarks as blocks.  This should be made explicit in the model in SMC.=20

4.10 - Tape Capacity page.

How to report remaining tape capacity was discussed, but no action was taken=

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