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Me, Myself and GD. Felix Ehm. Location. HARIBO. Little Introduction. Introduction Fellow IT-GD-ITR Oliver, Laurence as supervisors Andreas, Joachim, Gergo, Louis, Maria, Di, Juha, Ricardo (currently) 28 years old Activities EGEE information System GLUE 2.0 GSTAT 2.0 VOMRS.

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Me, Myself and GD

Felix Ehm


Location

HARIBO

Little Introduction

  • Introduction

    • Fellow

    • IT-GD-ITR

    • Oliver, Laurence as supervisors

    • Andreas, Joachim, Gergo, Louis, Maria, Di, Juha, Ricardo

    • (currently) 28 years old

  • Activities

    • EGEE information System

    • GLUE 2.0

    • GSTAT 2.0

    • VOMRS

Felix Ehm, CERN 2008


The EGEE Information System

Felix Ehm, CERN 2008


The EGEE Information System

  • What is it ?

    • Decentralized information system providing ways to discover services in a Grid Infrastructure

    • Hierarchical structure of BDIIs (Berkley Database Information Index)

    • Uses the OpenLDAP server (and Berkley database) internally

    • Essential part of the instrastructure

  • What is it used for ?

    • Publishing Grid resource/service status information

    • Matchmaking of jobs/resources

    • Monitoring

    • Accounting

  • Who uses it ?

    • Nearly every gLite component (SE, CE, WMS, UI, ..)

Felix Ehm, CERN 2008


Information Flow

The EGEE Information System

  • Architecture

    • Resource-, Site- and Top-Level BDII

    • One core component (BDII)

    • Each level caches information

    • Information flow follows ‘pull’ principle

    • Data format is LDIF

    • DB is recreated every 2min

  • Facts and Figures

    • 70 top level BDIIs worldwide

    • 256 site level BDIIs

    • Refresh rate 2-5 min for top level

    • Data size ~32 MByte LDIF data (30sec to add)

    • Top-level at CERN handles 4 Million requests/day and serves the full database within 2,5sec; 8 head nodes at 20-30% averaged CPU load

    • BDII scales linearly (~32% speedup/additional core)

    • Requesting big data sizes >1MByte slows the system down

    • Many supported platforms

Felix Ehm, CERN 2008


o=grid

o=infosys

Entries

TimeToAdd

TimeToSearch

ServedRequests

The EGEE Information System

  • How am I involved ?

    • Performance tests

    • Developments

      • Compressed Content Exchange mechanism (32MByte reduced to 3.3MByte)

      • BDII statistics

      • Monitoring Information System infrastructure using Nagios

Felix Ehm, CERN 2008


GLUE Schema

Felix Ehm, CERN 2008


GLUE Schema

  • What is it ?

    • Grid Laboratory Unified Environment

    • Defines a common conceptual data model to be used for Grid resource/service discovery

    • Working group part of the OpenGridForum (OGF)

    • Available as Version 1.3 (http://forge.ogf.org/)

  • Latest News :

    • GLUE 2.0 in progress :

      • Elaborated in respect of 1.3 problems

      • Not backward compatible to 1.3

      • Goes to public comments end of April

  • How am I involved ?

    • Chairing storage schema discussion

    • Render relational model of schema

Felix Ehm, CERN 2008


GSTAT 2.0

Felix Ehm, CERN 2008


GSTAT

  • What is GSTAT ?

    • Displays summarized information about a Grid infrastructure

    • Content checking on IS

    • Monitor dynamic values from the information system

    • Database driven architecture where data is gathered by agents developed by Academica Sinica (Taipei)

Felix Ehm, CERN 2008


GSTAT

Felix Ehm, CERN 2008


GSTAT

Felix Ehm, CERN 2008


GSTAT

  • What is GSTAT ?

    • Displays summarized information about a grid infrastructure

    • Content checking on IS

    • Monitor dynamic values from the information system

    • Database driven architecture where data is gathered by agents developed by Academica Sinca (Taipei)

  • Why another version ?

    • “evolved over the past few years from a simple cgi script which displayed the summary of the grid infrastructure to a production service„

    • Optimizing the visualization: CERN-PROD html page 500KB (only source)+744 pictures each 14KByte = 10,5MByte

    • New Requirements/Use Cases

  • What is the plan ?

Felix Ehm, CERN 2008


VORMS

Felix Ehm, CERN 2008


VOMRS

  • Just started

    • Take over work from Lanxin

    • Nothing to report (yet)

Felix Ehm, CERN 2008


End

Questions ?

Felix Ehm, CERN 2008


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