Ordered Task Tags

Charles Monia cmonia at NishanSystems.com
Tue Jan 30 11:50:01 PST 2001


* From the T10 Reflector (t10 at t10.org), posted by:
* Charles Monia <cmonia at NishanSystems.com>
*
> -----Original Message-----
> From: Jim McGrath [mailto:Jim.McGrath at quantum.com]
> Sent: Monday, January 29, 2001 5:59 PM
> To: 'Santosh Rao'; Gerry.Houlder at seagate.com
> Cc: t10 at t10.org
> Subject: RE: Ordered Task Tags
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Jim McGrath <Jim.McGrath at quantum.com>
> *
> 
> No - unless you say it is a requirement, it is not a 
> requirement.  That is
> why standards often have more of a feel of a legal document 
> than a design
> guide.
> 
> Specifically, imagine you are given the task of compliance 
> testing and you
> had to defend what you were testing.  It is clear that the 
> ORDERED property
> is meaningless outside of the context of task sets (i.e. it 
> is not mentioned
> except with respect to the task set model), and so you cannot 
> test them in
> contexts where task sets do not apply (as in transports).
> 

Put another way, without a repeatable, causal relationship between the
observable initiator and logical unit behaviors, the requirement is
untestable and therefore meaningless.

Charles

> Jim
> 
> 
> -----Original Message-----
> From: Santosh Rao [mailto:santoshr at cup.hp.com]
> Sent: Friday, January 26, 2001 5:05 PM
> To: Gerry.Houlder at seagate.com
> Cc: t10 at t10.org
> Subject: Re: Ordered Task Tags
> 
> 
> Gerry and All,
> 
> In the case of a transport protocol that does NOT provide 
> ordered delivery,
> does it then become a requirement that the transport order 
> the delivery of
> ordered task tag commands ?
> 
> IOW, is it the intent of users of ordered task tag commands to obtain
> end-to-end ordering, or would they just use CRN for 
> end-to-end ordering ?
> 
> Thanks,
> Santosh
> 
> Gerry.Houlder at seagate.com wrote:
> 
> > * From the T10 Reflector (t10 at t10.org), posted by:
> > * Gerry.Houlder at seagate.com
> > *
> >
> > The target can only order tasks with respect to the order 
> it receives
> them.
> > This will match the order sent by the initiator only if 
> in-order delivery
> > is guaranteed by the delivery subsystem.
> >
> > *
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