Re: iSCSI: Logout request

[Paul Koning <ni1d@arrl.net>]

Excerpt of message (sent 30 April 2002) by Mallikarjun C.:
> > Not necessarily, and that's why I bring up the issue.
> 
> Sorry, but I do not see an issue as far as the spec is concerned.
> 
> You are describing what is obviously an implementation possibility -
> the spec neither suggests nor prohibits it, rightly so.
> 
> I already agreed that what you describe is a legal possibility per
> spec -  Initiator may login immediately, only the regular timeout 
> considerations described in 6.3 apply.

Good, that's what I thought.

My request is for some words that tell implementations to consider
this possibility.

Without such words, the problem is that some initiator implementers
think that a target logout request means "go away and NEVER come
back", so they treat that as "device has gone offline" and start
returning fatal errors to subsequent I/O requests.  Since it's not the
intent of the spec that it should be viewed that way, it would help
those of us who want to use target logout request in the manner I
described to have the spec say this is a possibility.

	paul

 
> ----- Original Message ----- 
> From: "Paul Koning" <ni1d@arrl.net>
> To: <cbm@rose.hp.com>
> Cc: <ips@ece.cmu.edu>
> Sent: Tuesday, April 30, 2002 11:51 AM
> Subject: Re: iSCSI: Logout request
> 
> 
> > Excerpt of message (sent 30 April 2002) by Mallikarjun C.:
> > > >The target may have good reasons to want a
> > > > particular connection or session to be closed but allowing a new login
> > > > to occur right after that.
> > > 
> > > It is a legal possibility, but I think it's unlikely for the reasons described 
> > > above.  If the NIC is being replaced on the target end, an immediate new 
> > > Login attempt will fail.
> > 
> > Not necessarily, and that's why I bring up the issue.
> > 
> > If the target has multiple NICs, and one of them has to be taken out
> > of service, it may be that it can move the address (but not the open
> > session and connection state) to another NIC.  In that case, a "target
> > request logout" is the mechanism it would want to use to initiate that
> > operation, and if the initiator then follows up with a new login,
> > everything works smoothly.
> > 
> >    paul
> > 
> >