Really getting rid of AEN

Gerry.Houlder at seagate.com Gerry.Houlder at seagate.com
Tue Jan 7 08:47:22 PST 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* Gerry.Houlder at seagate.com
*

Jim, you are beating a dead horse.

The decison to remove AEN was based on having zero implementations of AEN
being supported by both initiator and target in any system known to T10
members over the last 15 years. Further, no T10 members thought they would
implement AEN in the future. Even new protocols being brought into the SCSI
fold (SAS, Infiniband, etc.) did not foresee any need for AEN and rebelled
against providing an awkward (but implementable) method of doing AEN just
to satisfy SAM when no one would actually implement it (because it was so
awkward). T10 has removed other useless (at least in hindsight) features
with far less evidence and passage of time than this.



                                                                                              
                    JimMcGrath at oa                                                             
                    ktech.com            To:     roweber at acm.org                              
                    Sent by:             cc:     owner-t10 at t10.org, T10 at t10.org               
                    owner-t10 at t10        Subject:     Re: Really getting rid of AEN           
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                    01/06/2003                                                                
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* From the T10 Reflector (t10 at t10.org), posted by:
* JimMcGrath at oaktech.com
*





Ralph,

What is suppose to replace AEN (aka AER) going forward?  That is, how does
a target (device server) notify the initiator (application client) of a
change in status unrelated to a command, and especially without awaiting
for a command?

This capability is not physical protocol related, and I don't think is
device type related, and so should be in SAM (if not, then what document
will it be in?)

Jim

PS while I saw the notice of the decision (and vote) to remove AEN in the
minutes, I did not see a proposal on the topic (which would usually address
these sorts of issues).




                      Ralph Weber
                      <ralphoweber at comp        To:       "T10, Reflector"
<T10 at t10.org>
                      userve.com>              cc:
                      Sent by:                 Subject:  Really getting rid
of AEN
                      owner-t10 at t10.org


                      01/06/2003 06:23
                      AM
                      Please respond to
                      roweber






* From the T10 Reflector (t10 at t10.org), posted by:
* Ralph Weber <ralphoweber at compuserve.com>
*
In November, T10 remove AEN [aka AER] from SAM-3.
Now, the time has come for the other shoe to drop.

The really (shall we say) 'interesting' work for
removing AEN is in SPC-3 and a proposal to do the
deed is available as:

  ftp://ftp.t10.org/t10/document.03/03-051r0.pdf

There are little bits here and there that need to
be removed or made obsolete, but there are two
areas where substantial changes are proposed:

  - The Control mode page, and
  - The processor command set.

Enjoy.

.Ralph



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