Renumber SAS device types

George Penokie gop at
Fri Oct 11 09:25:24 PDT 2002

* From the T10 Reflector (t10 at, posted by:
* George Penokie <gop at>

For the case you described 0 should be labeled as 'No device attached' or
something to that affect. I do not think reserved or ignored are good
choices in this case.

Bye for now,
George Penokie

Dept 2C6  114-2 N212
E-Mail:    gop at
Internal:  553-5208
External: 507-253-5208   FAX: 507-253-2880

                      "Elliott, Robert                                                                                                 
                      (Server Storage)"        To:       <t10 at>                                                                 
                      <Elliott at>         cc:                                                                                     
                      Sent by:                 Subject:  Renumber SAS device types                                                     
                      owner-t10 at                                                                                                
                      10/10/02 01:58 PM                                                                                                

Are the any objections to shifting the DEVICE TYPE field in the IDENTIFY
address frame and the SMP DISCOVER function from:

0 = end device
1 = edge expander device
2 = fanout expander device
3-7 = reserved

0 = reserved  (or ignored?)
1 = end device
2 = edge expander device
3 = fanout expander device
4-7 = reserved

This would allow DISCOVER to return "0/reserved" rather than "0/end device"
for a phy that has no valid device attached. All the other DISCOVER fields
like the link rate fields return 0/reserved, not something that looks like
a valid value, in this situation.

Rob Elliott, elliott at
Industry Standard Server Storage Advanced Technology

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