Re: iSCSI: draft vs. 14 typos, suggestion, questions

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

Julian,

>Mallikarjun,
>
>We decided early one that we don't want to touch the notion of a task  set
> because of the mess we are going to have to handle with TST=0.
>What has changed?

Nothing, what I propose below is consistent with that desire.

Unless we have to use the term "task set" (as in defining Clear Task Set),
there's no need to invoke the SCSI-reserved term - simply because iSCSI
doesn't know the current TST status in the SCSI layer.

The change proposed below takes one usage out, and defines the action
in iSCSI-terms (tasks with allegiance).

Thanks.
--
Mallikarjun

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






"Mallikarjun C." <cbm@rose.hp.com>
Sent by: owner-ips@ece.cmu.edu
07/11/2002 02:38 AM
Please respond to "Mallikarjun C."


        To:     "Julian Satran (Actcom)" <Julian_Satran@actcom.net.il>,
<pat_thaler@agilent.com>, <tomasb@s3group.cz>
        cc:     <ips@ece.cmu.edu>, <ivan.pavelka@s3group.com>
        Subject:        Re: iSCSI: draft vs. 14 typos, suggestion, questions



Sorry, I'm catching up late on email....

I see that the latest wording on this is -

When the session timeout (the connection state timeout for the last failed
connection) happens on the target,
it takes the following actions:
- Resets or closes the TCP connections (closes the session).
- Aborts all Tasks in the task set associated with the session.

I think the second bullet is incorrect.  While the previous wording had
the
issue that Pat identified (that there may be one task set for each LU the
session
can get to), the new wording still has that issue and in addition, also
implies that
all tasks in the task set need to be terminated.  However, a LU may
maintain only one
task set for multiple initiators (if TST=0 in control mode page) in which
case, the
current wording implies that all tasks from other initiators need to be
terminated
as well on one session timeout - which is not intended.

I am beginning to think that the notion of "task set" is beyond iSCSI and
it's best
not to refer to it here.

I suggest the following text instead -

When the session timeout (section 4.3.5) happens on the target, it takes
the following actions:
- Resets or closes the TCP connections (closes the session).
- Terminates all active tasks that were allegiant to the connection(s)
that constituted the session.

Thanks.
--
Mallikarjun

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

----- Original Message -----
From: "Julian Satran (Actcom)" <Julian_Satran@actcom.net.il>
To: <pat_thaler@agilent.com>; <tomasb@s3group.cz>
Cc: <ips@ece.cmu.edu>; <ivan.pavelka@s3group.com>
Sent: Thursday, July 04, 2002 9:08 PM
Subject: Re: iSCSI: draft vs. 14 typos, suggestion, questions


> I will do the text change (I hope it makes it easier for at least one
reader
> is not worse for anybody else).
> The reason why we choose the wording was that SAM associates the task
set
> with an initiator by the session is wording is equivalent.
>
> Julo
> ----- Original Message -----
> From: <pat_thaler@agilent.com>
> To: <Julian_Satran@il.ibm.com>; <tomasb@s3group.cz>
> Cc: <ips@ece.cmu.edu>; <ivan.pavelka@s3group.com>
> Sent: Wednesday, July 03, 2002 9:38 PM
> Subject: RE: iSCSI: draft vs. 14 typos, suggestion, questions
>
>
> > See comment below. Pat
> > -----Original Message-----
> > From: Julian Satran [mailto:Julian_Satran@il.ibm.com]
> > Sent: Wednesday, July 03, 2002 9:20 AM
> > To: Tomá? Bartu?ek
> > Cc: ips@ece.cmu.edu; ivan.pavelka@s3group.com
> > Subject: Re: iSCSI: draft vs. 14 typos, suggestion, questions
> >
> >
> >
> > *** Section 6.11 : QUESTION
> > Draft says:
> >   When the session timeout (the connection state timeout for the last
> >   failed connection) happens on the target, it takes the following
> >   actions:
> >
> >     - Resets or closes the TCP connections (closes the session).
> >     - Aborts all Tasks in the task set for the corresponding initi-
> >       ator.
> >
> > What does the "corresponding initiator" mean? We think (:-)), that
> > there is only one initiator for the session. The only possible
> > explanation we see for that paragraph is, that the target should
> > abort also other tasks of the same in __other__ sessions, but
> > why?
> > +++ your interpretation is correct - the statement means the initiator
> that "owned" the session.
> > Are you suggesting other wording?
> > ++++
> > <PAT> "Aborts all task sets associated with the session"
> > (Task set was changed to plural because task set is defined as an
I-T-L
> nexus and there may be muliple ones in the session. <PAT>
> >
>
>