Maximum SAS devices

Seto, Pak-lung pak-lung.seto at intel.com
Tue Sep 30 07:29:20 PDT 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* "Seto, Pak-lung" <pak-lung.seto at intel.com>
*
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A maximum of 127 end devices can be attached to an edge expander (set)
becuase the edge expander (set) will consume a minimum of 1 SAS address
- an edge expander (set) can consume up to 128 SAS addresses.  For the
FO expander, it can have up to 128 links - i.e. 129 SAS addresses.  At
least this is how ISAS 1.0 said.
=20
Pak

-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org]On Behalf Of
Czekalski, Marty
Sent: Tuesday, September 30, 2003 8:30 AM
To: 'EGR'
Cc: Lea Schwartz (E-mail); T10 at t10.org
Subject: RE: Maximum SAS devices


The FAQs were done about a year and a half ago and reflected what the
goal was at the time.  As the spec was finalized and the fields defined
in detail, it was possible to allow up to 128 physical links per
expander.   The number of devices will be less than 128 if wide links
are used. The FAQs need to be updated.
=20
Marty

-----Original Message-----
From: EGR [mailto:egr_mail at yahoo.com]
Sent: Monday, September 29, 2003 4:44 PM
To: T10 at t10.org
Subject: Maximum SAS devices



Hi all,

=20

Quick question on SAS. =20

The SCSI Trade Association SAS FAQ (point 5) indicates that an expander
can address a maximum of 64 devices and there is a maximum of 4096
devices in a domain.

I can't find anything in the spec that indicates the above.=20

In fact, the spec indicates that the maximum number of SAS addressed
used by an expander is 128.

=20

Is the FAQ incorrect, or am I missing something?

=20

Thanks,

=20

Elizabeth Rodriguez

=20


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 @page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in = 1.25in; } P.MsoNormal { 	FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } LI.MsoNormal { 	FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } DIV.MsoNormal { 	FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } A:link { 	COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { 	COLOR: blue; TEXT-DECORATION: underline } A:visited { 	COLOR: purple; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { 	COLOR: purple; TEXT-DECORATION: underline } SPAN.EmailStyle17 { 	COLOR: windowtext; FONT-FAMILY: Arial } DIV.Section1 { 	page: Section1 } A=20 maximum of 127 end devices can be attached to an edge expander (set) = becuase the=20 edge expander (set) will consume a minimum of 1 SAS address - an edge = expander=20 (set) can consume up to 128 SAS addresses.  For the FO = expander, it=20 can have up to 128 links - i.e. 129 SAS addresses.  At least this = is how=20 ISAS 1.0 said.
  
 Pak
 -----Original Message-----
From: owner-t10 at t10.org = [mailto:owner-t10 at t10.org]On Behalf Of Czekalski, = Marty
Sent:=20 Tuesday, September 30, 2003 8:30 AM
To: 'EGR'
Cc: = Lea=20 Schwartz (E-mail); T10 at t10.org
Subject: RE: Maximum SAS=20 devices


 The=20 FAQs were done about a year and a half ago and reflected what the = goal was at=20 the time.  As the spec was finalized and the fields defined in = detail, it=20 was possible to allow up to 128 physical links per = expander.   The=20 number of devices will be less than 128 if wide links are = used. The=20 FAQs need to be updated.
  
 Marty
 -----Original Message-----
From: EGR=20 [mailto:egr_mail at yahoo.com]
Sent: Monday, September 29, = 2003 4:44=20 PM
To: T10 at t10.org
Subject: Maximum SAS=20 devices





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