Re: iSCSI: TSIH clarifications

["Mallikarjun C." <cbm@rose.hp.com>]

> It has been noted earlier by Julian on IPS that
> TSID is rather redundant as uniqueness is achieved
> by INAME+ISID+TPGT+TNAME. (Mar 17 2002, Subject: TSID rule.)

Yes, that's what triggered the TSID name change of as well since it was 
wrongly implying to be part of the SSID.

Let me elaborate somewhat on the (what I call as the "two-universe")
model that the draft attempts to describe in general.

One universe consists of *all* iSCSI nodes - the 4-tuple mentioned
above provides uniqueness in this universe.

The other universe consists of just the two iSCSI nodes in question and
(ISID + TSID) until now has been the unique identifier of a session in this 
universe - the (erstwhile) TSID rule was intended to enforce this uniqueness.
But several of us realized that indeed this is not necessary, and removing the
two node names from the 4-tuple is all we need to do for uniqueness in
this constrained universe.  Hence the change in SSID.

BTW, the tuple table that Luben refers to is part of the draft from 11-9*.
--
Mallikarjun

Mallikarjun Chadalapaka
Networked Storage Architecture
Network Storage Solutions Organization
Hewlett-Packard MS 5668 
Roseville CA 95747
cbm@rose.hp.com