Minutes of X3T10 SCC Working Group Meeting - May 07, 1996

Lohmeyer, John JLOHMEYE at cossymwest.co.symbios.com
Tue May 14 08:46:00 PDT 1996


* From the SCSI Reflector, posted by:
* "Lohmeyer, John" <JLOHMEYE at COSSYMWEST.CO.SYMBIOS.COM>
*

Accredited Standards Committee
X3, Information Processing Systems
                                                 Doc. No.: X3T10/96-165r0
                                                     Date: May 10, 1996
                                                  Project: 1047D
                                                Ref. Doc.:
                                                 Reply to: G. Penokie

To:       Membership of X3T10

From:     George Penokie

Subject:  Minutes of X3T10 SCC Working Group Meeting -May 07, 1996



AGENDA

1. Opening Remarks
2. Attendance and Membership
3. Approval of Agenda
4. Report on status of the SCC-2 project proposal
5. Indication that a redundancy group is overlaid
6. Making it illegal to modify an object without specifying the object
7. Allow a spare to be configured to cover all like objects within a
   target in one service action
8. Add disable, enable, and report disabled volume set service actions
9. Add a report device identification service action
10. What to return in Report LUN command?
11. The difference between p_extent and ps_extent
12. Add in a new redundancy group identifier of P+S redundancy
13. Configure Storage Array Command and Report Storage Array   
Configuration
    Command
14. Annex of configuration examples
15. Action Items
16. Meeting Schedule
17. Adjournment

Results of Meeting

1.      Opening Remarks

George Penokie convened the meeting at 9:00 am, Tuesday, May 07, 1996.
He thanked Norm Harris of Adaptec for hosting the meeting.

This is a joint meeting of the X3T10 SCSI Controller Commands working   
group
and the RAB Host Interface working group.  The purpose of the group is to
deal with interface issues related to using RAIDs.  The study group will
assess the issues and then formulate a strategy for dealing with them.

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.  Working group 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.

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.

RAID Study Group Meeting Attendees

Attendee          Company             Email Address
 ----------------  ------------------  -------------------------------
A. Taylor         Adaptec             ataylor at corp.adaptec.com
Edward Fong       Amdahl              esfi0 at spg.amdahl.com
Chris Nieves      Auspex              cnieves at auspex.com
Doug Hagerman     DEC                 hagerman at starch.enet.com
Paul Massiglia    DEC                 massiglia at genral.enet.dec.com
Brett Quinn       EMC                 quinn_brett at isus.emc.com
John Hartjen      EMC                 hartjen_john at isus.emc.com
Dal Allan         ENDL                dal_allen at micmail.com
George Penokie    IBM                 gop at rchvmp3.vnet.ibm.com
Dan Strevey       Intellistor/Fujitsu dstrevey at intellistor.com
Corky Ball        JMR Electronics     corky at jmr.com
Bob Snively       Sun Microsystems    bob.snively at sun.com
Rick Wagner       Stream Logic        richard_wagner at streamlogic.com
Rod DeKoning      Symbios Logic       rod.dekoning at symbios.com
M.W. Jibbe        Symbios Logic       mahmoud.jibbe at symbios.com
Joe Molina        Technology Forums   tforums at ic.manicato.mn.us
Dave Wehrman      Unisys              75122,177 at compuserve.com
Paul Scammell     Veritas             ps at veritas.com
Rager Klorese     Veritas             rogerk at veritas.com
Ed Barnes         Xyratex/Peer        edbarnes at primenet.com


3.       Approval of Agenda

The agenda presented at the meeting was approved.

4.      Report on status of the SCC-2 standard

The SCC-2 project proposal(96-152r0) will be presented to X3T10 for vote.

5.      Indication that a redundancy group is overlaid

This proposal was accepted without comment.

6.      Making it illegal to modify an object without specifying the   
object

This proposal was accepted without comment.

7.      Allow a spare to be configured to cover all like objects within a
        target in one service action

It was requested that the term 'like objects' be clearly defined in SCC.
This definition should also discuss if like objects may or may not have a
capacity less than the spare (eg can a  2GB drive cover a 1GB drive).

During the discussion it was requested that the cover all be split into   
to
two functions. One function would be to cover all like devices regardless
of any other currently defined spares (note: this is the way things work   
in
SCC and that behavior should be make clear in SCC-2).  The other would be
to only cover those like objects that are not already covered by a spare.
(note: if there are no objects free to spare then an error should occur.)

8.      Add disable, enable, and report disabled volume set service   
actions

The group requested the disable and enable volume set service actions be
renamed to deassign and assign volume set.  No other requests for changes
was made.

9.      Add a report device identification service action

This proposal was accepted without comment.

10.     What to return in Report LUN command?

This was not discussed.

11.     The difference between p_extent and ps_extent

George pointed out the model is not clear and the differences between a
p_extent and a ps_extent.  Information will be added to the model in   
SCC-2
to make it cleared on the differences.

12.     Add in a new redundancy group identifier of P+S redundancy

This was proposal was accepted with requests that more information be   
added
to the model to give examples of what things the spare would cover.


13.     Configure Storage Array Command and Report Storage Array
        Configuration Command

A long discussion occurred on weather a one command configuration is   
desired
or possible.  The group agreed such a command would be a good idea.  The
problem is getting more than two groups to agree on what the parameters
should be specified and the meaning of those parameters.  Rod agreed to   
put
a list of proposed parameters on the SCSI reflector within two weeks.

14.     Annex of configuration examples

George expressed the opinion that an annex containing examples of how a
host would use the SCC commands to configure various RAIDs would be   
useful.
All agreed this is a good idea but is a big job and it is uncertain it
actually be completed.

15.     Action Items

 -Develop a list of actions that could be used to create a one step
configuration command - Rod DeKoning
 -Add into the SCC-2 the proposals agreed to by the working group - George
Penokie

16.     Meeting Schedule

The next meeting will be hosted by Symbios Logic in Colorado Springs at   
the
Embassy Suites July 16 9:00AM to Noon.

17.     Adjournment

The meeting was adjourned at 12 noon.




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