Combined initiator & target names in SAM-2
Robert.Elliott at COMPAQ.com
Sat Nov 10 14:43:12 PST 2001
* 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
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org
More information about the T10