[rm-wg] Fwd: rm-wg post from donal.k.fellows at manchester.ac.uk requires approval

[David Snelling]

Cross post.


Begin forwarded message:

> From: rm-wg-owner at ogf.org
> Date: 13 April 2007 09:38:08 BDT
> To: rm-wg-owner at ogf.org
> Subject: rm-wg post from donal.k.fellows at manchester.ac.uk requires  
> approval
>
> As list administrator, your authorization is requested for the
> following mailing list posting:
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>     List:    rm-wg at ogf.org
>     From:    donal.k.fellows at manchester.ac.uk
>     Subject: Re: [ogsa-wg] Glossary terms for Thursday's call
>     Reason:  Post by non-member to a members-only list
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> From: "Donal K. Fellows" <donal.k.fellows at manchester.ac.uk>
> Date: 13 April 2007 09:37:43 BDT
> To: "Strong, Paul" <pstrong at ebay.com>
> Cc: ogsa-wg <ogsa-wg at ogf.org>, rm-wg at ogf.org
> Subject: Re: [ogsa-wg] Glossary terms for Thursday's call
>
>
> Strong, Paul wrote:
>> Within the RM-WG we have split attributes into configuration  
>> attributes and state attributes.  Configuration attributes to some  
>> degree define behavior, defining or constraining the set of  
>> allowed states, as well as the possible values of state attributes  
>> and allowed transitions between states.  Clearly configuration  
>> attributes are “interesting”, and thus according to the definition  
>> below they would be considered part of the state.  I’m not sure  
>> that this is the case.
>
> An argument that I made during the call (and which it might have been
> nice to have delved into in more detail if we'd had a few days instead
> of 15 minutes!) is that an altered configuration creates a different
> resource/stateful entity[*], but an altered state is something that is
> expected during the normal working lifetime of a resource and does not
> change the fundamental nature of that resource. That is, a change of
> config is qualitatively different to a change of state, even if  
> both are
> (represented as) attributes.
>
> In general, there are loads of definitions of state (I've got a
> background which leads me to regard it as really a partial function
> whose domain is the cartesian product of time and names for "stateful"
> things) but they're just different ways of looking at the same thing.
> The good aspects of the current definition are that it is  
> observable and
> changes in it are events, things which are not implicit in the  
> standard
> CS definitions of the term and yet are very useful for grids.
>
> Donal.
> [* As you can tell, I've lost track of what kind of thing contains  
> such
>    attributes. I know *I* think of them as resources, but that doesn't
>    make me right. :-) ]
>
>
>
> From: rm-wg-request at ogf.org
> Subject: confirm 0a08b43c0f6c4e19e91434416d29c37e086ec4bd
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-- 

Take care:

     Dr. David Snelling < David . Snelling . UK . Fujitsu . com >
     Fujitsu Laboratories of Europe Limited
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