Combined initiator & target names in SAM-2

[Elliott, Robert]

* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert" <Robert.Elliott at compaq.com>
*


> -----Original Message-----
> From: Peter Johansson [mailto:PJohansson at acm.org]
> Sent: Saturday, November 10, 2001 4:23 PM
> To: NCITS T10
> Cc: SBP-3
> Subject: RE: Combined initiator & target names in SAM-2
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Peter Johansson <PJohansson at ACM.org>
> *
> At 04:00 PM 11/10/2001 -0600, Elliott, Robert wrote:
> 
> > The only protocol that has attempted to provide a device 
> > name so far is ISCSI, and its target/initiator devices 
> > can share one name.
> 
> Thanks for the clarification, Rob. Please CC: the SBP-3 
> reflector if it was one of the recipients of the messages.
> 
> Is "device" defined, in the context of initiator and target? My 
> recollection is that SAM-2 uses device in the context of 
> "device server". 
> This does not seem to be what is meant when "initiator 
> device" (or even "target device") is used. I think another 
> term would avoid confusion, but in any event I need to 
> consult a formal definition of "device" before I 
> comment further. Can you refer me to one?

This is all in SAM-2 now, since revision 18.  It came from 
George Penokie's proposal 00-268r8 "Defining Targets/Initiators 
as Ports".  See Figures 8, 11, 12, and 13 in SAM-2 revision 20.

The key components of the key objects are:

Initiator device = 
	one or more initiator ports +
	zero or more application clients

Target device =
	one or more target ports +
	one or more logical units

Target port = 
	task router +
	target port identifier +
	optional target port name

Initiator port = 
	initiator port identifier +
	optional initiator port name

Logical Unit = 
	device server +
	task manager +
	logical unit number +
	one or more task sets

"Device server" is a problematic term, as is "device-type".
They should really be renamed "logical unit server" and 
"logical unit type" - they're probably legacies of SCSI 
before multi-LUN targets were invented.

---
Rob Elliott, Compaq Server Storage
Robert.Elliott at compaq.com

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