[glue-wg] glue2 cloud examples

[Salvatore Pinto]

(Hi Warren,
replies inline...

On 17/06/2014 03:00, Warren Smith wrote:
>
> Another disadvantage of adding new cloud entities to the model is that new renderings would also need to be defined.
>
>
> Comments on your points:
>
> * I've only had to use a couple extensions to represent clouds in the current GLUE2. I've used a few extensions to represent clusters, too (see https://github.com/OGF-GLUE/JSON/tree/master/examples). So, without some examples showing that a lot of extensions are needed, I don't agree with that point.
you are right, without examples it is difficult to make a decision. I 
have compared your implementations of JSON rendering for 
Compute_OpenStack with my 2.1 cloud entities and I come up with the 
attached draft of "profile". Considering the number of original 
attributes not used and the number of extensions, in my opinion, since 
most of the old attributes are not used and there are quite a few 
extensions to be added, there is a rational for defining new entities...
>
> * I don't think the GLUE2 entity names are self-explanatory in general - I always have to explain what they mean to new users. I don't think this is much worse for a cloud infrastructure than for a cluster or grid.
for me users with a basic knowledge of Grid computing should understand 
the meaning, of course this is not valid for all the users, what I was 
saying is that users with basic knowledge of Cloud computing would 
probably not be able to understand all the meaning of the profiled 
attributes without reading the doc...
> * I don't quite follow the first advantage you list under "GLUE 2.1". In GLUE 2.0, ComputingActivity (instance) has a RequestedApplicationEnvironment attribute (image). ComputingActivity also has a Share association (inherited from Activity), but I'm not sure what a Share represents here.
a share in my view represented a zone (or sub site), like "Amazon Asia 
Pacific Site", with related quota, resources and templates associated
>
> Warren
Cheers,
   Salvatore.
>
> ________________________________________
> From: Salvatore Pinto [salvatore.pinto at egi.eu]
> Sent: Tuesday, May 06, 2014 9:16 AM
> To: Navarro, John-Paul F.; Warren Smith
> Cc: OGF GLUE Working Group
> Subject: Re: [glue-wg] glue2 cloud examples
>
> Hi All,
> here my comments to be discussed in today's teleconferece.
>
> Cloud Profile for GLUE 2.0
>     Advantages:
>       * No need to update the implementation.
>       * No need to manage two separate group of entities.
>     Disadvantages:
>       * Big usage of extended attributes to represent all the needed
> additional attributes and many attributes are not needed. Eg. you add
> around 3-4 new attributes to each entities and you do not use more than
> 10 in average.
>       * Some attributes names from the implementation
> (ApplicationEnvironment, ExecutionEnvironment) will not be
> self-explanatory and user will always need to read the profile to
> understand the meaning of the implementation.
>
> GLUE 2.1
>     Advantages:
>       * Possibility to represent a different conceptual model, where the
> OS images (application environment) are directly linked to the VM
> (computing activity) and to the Share (Computing Share) so to the
> Policies (VM can be private and started only to a given share associated
> to given VOs)
>       * Easier extension to future non-IaaS computing services (with its
> own set of resources, you can edit them without messing with the Grid
> entities)
>     Disadvantages:
>       * Need to update the implementation, adding the new cloud entities.
>       * Cloud and Grid are seen separated, not as an unique computing
> resource.
>
> Cheers,
>     Salvatore.
>


-- 
Salvatore Pinto
Cloud Technologist, EGI.eu
e-mail: salvatore.pinto at egi.eu
skype: salvatore.pinto0
Science Park 140, Amsterdam, The Netherlands

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