RE: iSCSI: session login and ISID

["Somesh Gupta" <someshg@yahoo.com>]

> -----Original Message-----
> From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
> julian_satran@il.ibm.com
> Sent: Tuesday, April 10, 2001 4:22 AM
> To: ips@ece.cmu.edu
> Subject: Re: iSCSI: session login and ISID
> 
> 
> 
> 
> WWUI can be presented during login phase (2.10.9 is correct and in-line
> with 1.2.7) Two sesions can have the same ISID but will have different
> TSID. The question of whether more than one session should be allowed
> between a pair of wuis is under debate.

Why are we debating this? Multiple sessions (one
connection per session) is a simpler, more robust and higher
performance model than multiple connections per session.

Somesh
> 
> Julo
> 
> sandeepj@research.bell-labs.com (Sandeep Joshi) on 09/04/2001 20:27:46
> 
> Please respond to sandeepj@research.bell-labs.com (Sandeep Joshi)
> 
> To:   ips@ece.cmu.edu
> cc:
> Subject:  iSCSI: session login and ISID
> 
> 
> 
> 
> There seems to be a problem in distinguishing session logins, using
> only the ISID field in the Login Command.   It is possible that
> different initiators could try to start a session using the same ISID
> value.   One of those attempts will get rejected, since the ISID is
> the sole key to find if a session already exists. (note: TSID was
> sent as zero for the leading connection of session)
> 
> The initiator WWUI does not seem to be available at this time.
> a) Appendix D.10 states that InitiatorWWUI is optional and defaults
>    to iSCSI.
> b) Section 2.10.9 on Login Command states that "initiator MAY provide
>    some basic parameters".
> 
> On the other hand, Section 1.2.7 states that "the initiator MUST
> present both its initiator WWUI and target WWUI to which it wishes
> to connect during the login phase".
> 
> The WWUI is also needed if we are to support multiple I_T nexuses
> between the same initiator and target.
> 
> So it seems like Section 1.2.7 has the right spec.   Appendix D and
> Section 2.10.9 must then be corrected.  The descriptions in Sec 4.1
> and Section 1.2.3 may also need to be changed to reflect the fact
> that initiator WWUI must be supplied at session login.
> 
> -Sandeep
> 
> 
> 

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