SAS-1.1 : Expander limit shown in SAS Domain class diagram

George Penokie gop at us.ibm.com
Fri Jul 29 07:00:09 PDT 2005


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* George Penokie <gop at us.ibm.com>
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Chris, 

The expander class shown in figure 10 is further defined in figure 19.
Figure 19 shows the relationship between the different types of
expanders and expander sets. Figures 25, 26, and 27 are more like
instance drawings that should the maximum possible number of expanders
is some different configurations. The short of it is that Figure 10 is
correct and so are figures 25, 26, and 27. 


Bye for now,
George Penokie

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





"Fore, Chris" <Chris_Fore at adaptec.com> 
Sent by: owner-t10 at t10.org 


07/29/2005 08:16 AM 

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Subject
SAS-1.1 : Expander limit shown in SAS Domain class diagram

	





Figure 10 of section 4.1.1 of SAS-1.1 (Revision 9e) appears to indicate
that the Service delivery subsystem contained by a single SAS domain may
contain up to 127 Expander devices.   
  
Figures 25, 26, and 27 of section 4.1.8.3 appear to contradict that
upper limit by showing a examples of a single SAS domain containing more
than a single edge expander device set. 
  
Is Figure 10 correct? 
  
:: R. Chris Fore 
:: Principal Engineer - Storage Systems Architecture 
:: Adaptec, Research Triangle Park, NC 
:: (919) 287-2024 
  


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<br><font size=2 face="sans-serif">Chris,</font>
<br>
<br><font size=2 face="sans-serif">The expander class shown in figure 10
is further defined in figure 19. Figure 19 shows the relationship between
the different types of expanders and expander sets. Figures 25, 26, and
27 are more like instance drawings that should the maximum possible number
of expanders is some different configurations. The short of it is that
Figure 10 is correct and so are figures 25, 26, and 27. </font>
<br>
<br><font size=2 face="sans-serif"><br>
Bye for now,<br>
George Penokie<br>
<br>
Dept 2C6 &nbsp;114-2 N212<br>
E-Mail: &nbsp; &nbsp;gop at us.ibm.com<br>
Internal: &nbsp;553-5208<br>
External: 507-253-5208 &nbsp; FAX: 507-253-2880<br>
<br>
</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>"Fore, Chris"
<Chris_Fore at adaptec.com&gt;</b> </font>
<br><font size=1 face="sans-serif">Sent by: owner-t10 at t10.org</font>
<p><font size=1 face="sans-serif">07/29/2005 08:16 AM</font>
<td width=59%>
<table width=100%>
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<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td valign=top><font size=1 face="sans-serif"><t10 at t10.org&gt;</font>
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<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
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<tr>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">SAS-1.1 : Expander limit
shown in SAS Domain class diagram</font></table>
<br>
<table>
<tr valign=top>
<td>
<td></table>
<br></table>
<br>
<br>
<br><font size=2 face="Arial">Figure 10 of section 4.1.1 of SAS-1.1 (Revision
9e) appears to indicate that the Service delivery subsystem contained by
a single SAS domain may contain up to 127 Expander devices. &nbsp;</font>
<br><font size=2 face="Arial">&nbsp;</font>
<br><font size=2 face="Arial">Figures 25, 26, and 27 of section 4.1.8.3
appear to contradict that upper limit by showing a examples of a single
SAS domain containing more than a single edge expander device set. </font>
<br><font size=2 face="Arial">&nbsp;</font>
<br><font size=2 face="Arial">Is Figure 10 correct? </font>
<br><font size=2 face="Arial">&nbsp;</font>
<br><font size=2 color=#000080 face="Arial">:: R. Chris Fore</font>
<br><font size=2 color=#000080 face="Arial">:: Principal Engineer - Storage
Systems Architecture </font>
<br><font size=2 color=#000080 face="Arial">:: Adaptec, Research Triangle
Park, NC </font>
<br><font size=2 color=#000080 face="Arial">:: (919) 287-2024 </font>
<br><font size=3 face="Times New Roman">&nbsp;</font>
<br>
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