Re: iSCSI: different question about terminated tasks

[Bill Studenmund <wrstuden@wasabisystems.com>]

On Wed, 29 Jan 2003, Mallikarjun C. wrote:

> >My question is what do we do if there are multiple tasks with the
> > NACA bit set? Do we initiate ACA for each of them, or only once?
>
> This is not an iSCSI issue (please see SAM2r23, 5.8.1), but I'll offer

Understood, but I figured this forum would know the answer. :-)

> just my interpretation of SAM-2.  Also note that there's no formal model
> in SAM-x for a SCSI transport layer to notify the SCSI application layer
> of a task termination due to transport dynamics.  The model (if and when
> one is spec'ed) would have to deal with the question of how the notification
> affects that task even when the ACA is active (which is the specific scenario
> you're describing).  I read SAM-2 (with the model caveat) as saying that
> there shall be one ACA for each terminated task today, if the task with the
> ACA attribute (the cleanup task) didn't cleanup those to-be-terminated tasks
> by then.

I expected that would be the answer. But it's best to ask. :-)

> > Also, in the case of Logout Request, do we wait for all the tasks to go
> > through ACA before sending the Logout Response?
>
> That's not the intent of the "cleanup" wording in 10.15.  Dealing with ACA is a
> SCSI matter.  The "cleanup" refers to the requirement on the iSCSI layer to
> cleanup all the iSCSI-level task and connection resources associated with the
> iSCSI connection (along with the task termination notifications, whose after-effects
> SCSI will deal with), before sending a successful Logout Response.
>
> Hope that helps.

Yes it does. Thanks.

Take care,

Bill