Gonçalo Borges wrote:

 >>> IMHO, I think that the gLite Cluster staff should present several use
 >>> cases and how to implement those different scenarios using gLite
 >>> Cluster.
 >>
 >> What kind of thing do you find difficult? ... it's quite hard to 
give general guidance
 >>
 >
 > Maybe it is just my problem of not understanding enough the Glue 
Schema concepts (I
 > guess I'm not the only one) but I think that examples of use cases 
should be given.

We need to pull some things together about the CLUSTER node type to 
start with, so that we can figure out how to deploy it. Here are my 
notes. I'd be looking for all the documents that told me things like this:

1) What is the purpose of the new node type? How does is it augment or 
replace existing functions of the current grid software at our site?

Note: Chris Brew gave a talk on some of these matters, here: 
http://hepwww.rl.ac.uk/sysman/nov2008/talks/Clusters,%20SubClusters%20and%20Queues.ppt

The work is based on the “Traylen Proposal”, which gives (I expect) a 
low-down on the architecture. I need a link for that.

2) What are the implications/advantages of using the CLUSTER node type 
at our site? Any disadvantages? Are there any risks that we should know 
about?

Note: Some of that is in Chris Brew's talk, but I need more 
definition/specifics. Anybody got any tips? Has anyone implemented it 
yet, and do they have any notes or comments?

3) How do we build the CLUSTER node type? What do I need to do to my 
current nodes (SEs, CEs, BDII, ... ) to make them interact with the new 
CLUSTER node type.

Note: I think some of this is explained here, here and here, but I'm 
looking for more detail:

https://twiki.cern.ch/twiki/bin/view/LCG/Site-info_configuration_variables#CLUSTER
info_configuration_variables#CLUSTER
http://glite.cern.ch/R3.1/sl4_i386/updates/70/
http://glite.cern.ch/glite-CLUSTER/

4) Is there anything else I need to do to make any other site aware of 
and/or interact with the CLUSTER node type? Are there any special 
measures I need to take when deploying the node type?

Note: scant on this. Anybody got any tips? All this information is 
available somewhere, although it may be just in someone's head - I could 
do with some slides from the developers to tell me how the “knee-bone 
connects to the leg-bone” etc.

Cheers for any help,


Steve

-- 
Steve Jones [log in to unmask]
System Administrator office: 220
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