RE: iSCSI : Aborting non-SCSI tasks.

[Charles Monia <cmonia@NishanSystems.com>]

Hi Santosh:

My .02 (again):

Assuming these transactions are handled in the iSCSI layer:

a) No abort mechanism is required.  Like a 'ping' operation, these functions
are expected to complete in some fixed time or not at all.

b) A timeout indicates the iSCSI layer is broken -- i.e., timeouts are
fatal.

Charles

> -----Original Message-----
> From: Santosh Rao [mailto:santoshr@cup.hp.com]
> Sent: Tuesday, April 24, 2001 1:31 PM
> To: Charles Monia
> Cc: IPS Reflector
> Subject: Re: iSCSI : Aborting non-SCSI tasks.
> 
> 
> Hi Charles,
> 
> non-scsi tasks refers to Login, Logout, Text & NOP-OUT PDUs.
> 
> Initiators will need to time these tasks [exchanges ?] and how do they
> deal with a timeout of such non-scsi tasks [exchanges/PDUs/commands] ?
> 
> 
> Regards,
> Santosh
> 
> 
> Charles Monia wrote:
> > 
> > Hi Santosh:
> > 
> > > The iSCSI spec is missing description on how non-SCSI 
> tasks should be
> > > aborted
> > 
> > What is a non-SCSI task?
> > 
> > Charles
> > > -----Original Message-----
> > > From: Santosh Rao [mailto:santoshr@cup.hp.com]
> > > Sent: Tuesday, April 24, 2001 10:27 AM
> > > To: IPS Reflector
> > > Subject: iSCSI : Aborting non-SCSI tasks.
> > >
> > >
> > > All,
> > >
> > > The iSCSI spec is missing description on how non-SCSI 
> tasks should be
> > > aborted in order to flush stale PDUs of that task. Initiators will
> > > typically time non-SCSI [& SCSI] tasks and will need to 
> resort to some
> > > form of abort and cleanup action on a timeout of the 
> non-scsi task.
> > >
> > > This is required in order to safely re-use the task tag resources
> > > without the danger of stale PDUs arriving from a previous
> > > incarnation of
> > > that task tag.
> > >
> > > The spec should provide some description on how this is 
> to be done.
> > > Perhaps, the semantics of Abort Task can be extended to 
> non-SCSI tasks
> > > as well, to avoid defining a second abort mechanism for
> > > non-SCSI tasks.
> > >
> > > - Santosh
> > >
>