DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 1 GLUE Schema - Status Report DataTAG WP4 meeting Bologna, 29 July 2003 Sergio Andreozzi INFN-CNAF

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 2 OUTLINE The Information Model – open issues Computing resources Storage resources Monitoring extensions The LDAP Implementation for MDS Integration status

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 3 Computing resources Issue 1: CE viewpoint of the cluster The subcluster concept is suitable to provide a summary description of the nature of a cluster in term of host characteristics It does not properly suits brokering needs This leads to the current EDG constraint of one subcluster per cluster This is a limitation because: Does not accommodate the hypothesis of heterogeneous clusters Does not accommodate flexibility in batch system configuration MISSING TO EXPRESS DESCRIPTION OF NODES ASSIGNED TO A SPECIFIC QUEUE

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 4 Computing resources Issue 1: CE viewpoint of the cluster CPU:PIII RAM:0.5GB OS:Linux … Head node gatekeeper infoService CPU:PIII RAM:0.5GB OS:Linux CPU:PIV RAM:2GB OS:Linux CMS CPU:PIV RAM:2GB OS:Linux ATLAS Batch server In this cluster, a computing element is configured with a node assigned to CMS VO. A specific software is installed in that node.

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 5 Computing resources Issue 1: CE viewpoint of the cluster CPU:PIII RAM:0.5GB OS:Linux … Head node gatekeeper infoService CPU:PIII RAM:0.5GB OS:Linux CPU:PIV RAM:2GB OS:Linux CMS CPU:PIV RAM:2GB OS:Linux ATLAS Batch server In this cluster, a computing element is configured with a node assigned to ATLAS VO. A specific software is installed in that node.

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 6 Computing resources Issue 1: CE viewpoint of the cluster this association needs to be introduced and described

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 7 Computing resources Issue 2: multiple entry points to a queue The CE Unique ID contains the contact point For scalability issues, in big cluster it is envisioned: To separate gatekeeper from batch server To deploy more than one gatekeeper This leads to the duplication of CE entities Needs to refine the CE definition Possible solution: refine the CE ID, (informally) from the grid entry point into a queue of a batch system, to the queue of a batch system Entry points are properties of the CE

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 8 Computing resources Issue 2: multiple entry points to a queue Worker node Worker node Worker node Worker node … Head node Batch server Access node1 gatekeeper Access node2 gatekeeper Access noden gatekeeper … queue gris Can run on an access node, on the Head node or on another machine e.g.: from CEUniqueID: accessnode1:2119/jobmanager-pbs-red accessnoden:2119/jobmanager-pbs-red to CEUniqueID: headnode/jobmanager-pbs-red (the list of accesspoints are attributes)

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 9 Storage resources The Grid Resource is the space being shared Glue SE Schema aims at provide a generalization for several Storage Resource Manager Glue SE Schema 1.1 is mainly based on experience on using disk-servers with a set of protocol to access/transfer data design documents related to SRM

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 10 Storage resources Current deployment experience within EDG 2.0 (where SE is the EDG-SE) is providing useful feedback Several refinements are needed in order to deal with new use cases I’m working on a proposal with use cases; this will take into account most of the features discussed during last CHEP (ref:

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 11 GLUE Schema extended for monitoring within DataTAG we have extended the host entity with several metrics these have not been proposed for inclusion in the GLUE schema any action on this?

DataTAG is a project funded by the European Union DataTAG WP4 meeting, Bologna 29/07/2003 – n o 12 GLUE Schema integration in VDT Early July, meeting with Alain Roy at CNAF Achievement: By this week in VDT there will be: Updated GLUE Schema, extended version EDG CE Info provider properly configured for CONDOR LRMS