SAM definition of SCSI Device

Bob Snively bob.snively at
Wed May 26 07:57:26 PDT 1999

* From the T10 Reflector (t10 at, posted by:
* Bob Snively <bob.snively at>
Selecting one portion of Ralph's discussion:

> My understanding is that the purpose behind this move to define an
> SCSI Device as having only one port relates to the issues you raise.
> The move intends to state clearly that the SCSI physical and transport 
> layers do not provide any support whatsoever for multi-path implementa-
> tions.  This certainly is true for the parallel SCSI bus.  But, the 
> technical editor for FCP-2 is adamant that it's an architectural 
> 'feature'; I assume because he believes that it would be wrong to add 
> multi-path address resolution features to FCP-2.

Actually, for those who are truly dedicated to "dynamic multi-pathing"
a la ESCON, Fibre Channel provides the feature through its hunt group
definitions with no change to SCSI or to FCP-2. 

Hope that helps.


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