SAS STP: maintaining affiliations through SATA/SAS changes

Hoglund, Tim thoglund at lsil.com
Wed Jan 29 15:24:11 PST 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* "Hoglund, Tim" <thoglund at lsil.com>
*
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How about:
 
Expander initiated link reset sequence keeps affiliation.
Wire-initiated OOB clears affiliation (assume SATA drive won't initiate
OOB after it's up and running)
 
In this manner initiators issuing link reset via SMP can keep
affiliation.
If a SAS drive is plugged in then affiliation is cleared as it should
be.
If a SATA drive is plugged in then affiliation is cleared, assume
hot-plug event, initiators must resolve ownership.
 
TimH



~~~~~~~~~~~~~~~~~~~~~~~ 
Tim.Hoglund at lsil.com 
719/533-7450 (Voice) 
719/533-7480 (Fax) 
~~~~~~~~~~~~~~~~~~~~~~~ 

-----Original Message-----
From: Elliott, Robert (Server Storage) [mailto:Elliott at hp.com]
Sent: Wednesday, January 29, 2003 3:14 PM
To: t10 at t10.org
Subject: SAS STP: maintaining affiliations through SATA/SAS changes



The current text in 9.3.2 indicates STP affiliations are maintained
until expander power off, SMP PHY CONTROL requests to change them, or
CLOSE (CLEAR AFFILIATION).

It specifically mentions that link reset sequences (e.g. from removing
the SATA device) do not change affiliations. 

If a SATA device is pulled and a SAS port shows up in its place, do we
want the expander to continue maintaining the affiliation?  It obviously
should not not block OPENs headed to the SAS port.  If the SAS port is
removed and a SATA device is put back, should the affiliation still be
there?


-- 
Rob Elliott, elliott at hp.com 
Hewlett-Packard Industry Standard Server Storage Advanced Technology 
 <https://ecardfile.com/id/RobElliott>
https://ecardfile.com/id/RobElliott 




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SAS STP: maintaining affiliations through SATA/SAS changes How about:
  
 Expander initiated link reset sequence keeps affiliation.
 Wire-initiated OOB clears affiliation (assume SATA drive won't initiate OOB after it's up and running)
  
 In this manner initiators issuing link reset via SMP can keep affiliation.
 If a SAS drive is plugged in then affiliation is cleared as it should be.
 If a SATA drive is plugged in then affiliation is cleared, assume hot-plug event, initiators must resolve ownership.
  
 TimH
 
~~~~~~~~~~~~~~~~~~~~~~~ 
Tim.Hoglund at lsil.com 
719/533-7450 (Voice) 
719/533-7480 (Fax) 
~~~~~~~~~~~~~~~~~~~~~~~ 
-----Original Message-----
From: Elliott, Robert (Server Storage) [mailto:Elliott at hp.com]
Sent: Wednesday, January 29, 2003 3:14 PM
To: t10 at t10.org
Subject: SAS STP: maintaining affiliations through SATA/SAS changes


 The current text in 9.3.2 indicates STP affiliations are maintained until expander power off, SMP PHY CONTROL requests to change them, or CLOSE (CLEAR AFFILIATION). It specifically mentions that link reset sequences (e.g. from removing the SATA device) do not change affiliations. If a SATA device is pulled and a SAS port shows up in its place, do we want the expander to continue maintaining the affiliation?  It obviously should not not block OPENs headed to the SAS port.  If the SAS port is removed and a SATA device is put back, should the affiliation still be there?
 -- 
Rob Elliott, elliott at hp.com 
Hewlett-Packard Industry Standard Server Storage Advanced Technology 
https://ecardfile.com/id/RobElliott 



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