makrand siddhabhatti tata institute of fundamental research mumbai 17 aug 2009 1

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GLITE LIGHTWEIGHT MIDDLEWARE FOR GRID COMPUTING

Makrand Siddhabhatti

Tata Institute of Fundamental Research

Mumbai

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OUTLINE gLite Component * WMS (Workload management

System) * Computing Element

* Worker Node * Monitoring Node * Storage Element

* User Interface

contd…

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CONTD …. gLite Architecture * Meta Scheduler * Local Resource Manager (LRM) * Virtual Organization Management

Service (VOMS) * gLite Information Services gLite Security Advance Topics * AMGA Metadata Catalogue Service * GANGA – The Job submission Tool * SRM-SRB

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WORKLOAD MANAGEMENT SYSTEM

Authentication and Authorization of User.

Accept Request From user. Selection of Appropriate Computing

Element. Keep Track of Jobs and their status. Also termed as Resource

Broker.

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WMS ARCHITECTURE

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WMS

USER @ UI

Grid Site(CE+SE+W

N)

Information Service

File Catalogu

e

WN

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COMPUTING ELEMENT Head Node of Grid Site. Working As a Site BDII (Grid information

index Server). Meta Scheduler (Maui). Batch Server for Worker Node

(pbs_server/LSF daemon). Operating GRIS (Grid information index

Server)

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WORKING OF CE

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CE+ Site BDII (GRIS)

(Pbs_server)(Maui

scheduler)

WN WN WN

GIIS

WMS

MON

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WORKER NODE Node of Actual Job Execution. Working as client for CE (pbs_mom/LSF

daemon). Update CE about the job Status. Work in private network but should able

to contact outside world.

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MONITORING NODE Used to Publish the information about

site. Based on RGMA (Relational Grid

Monitoring Architecture). * rgma-server and rgma-client

daemons. Publish information to Top Level BDII.

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STORAGE ELEMENT StoRM (Storage Resource Manager)

used to access the storage. Types of SE’s * DPM (Disk Pool Manager) * dCache * Castor Identification of files by GUID’s, LFN’s,

SURL’s .

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USER INTERFACE Entry Point of Users to access the Grid

Infrastructure with Valid Grid Certificate and VOMS membership.

Job Submission. Job Output retrieval.

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GLITE ARCHITECTUREMeta Scheduler : It is a job scheduler

containing the policy regarding execution of jobs.

LRM : Responsible for receiving, creating and placing jobs into execution.

VOMS : A facility provides the sharing of resources for the member

associated with similar operation or experiments.

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INFORMATION SERVICE

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GRIS (At Each Resources)

GIIS (Site BDII)

Top BDII

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GLITE SECURITY Authorization and Authentication . Public Key Infrastructure (PKI). SSL Protocol, authentication based on

sharing of public keys.

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AUTHENTICATION & AUTHORIZATION Identification of the end point of

communication called as Authentication. Verification of accessing virtual

organization and there resources called as Authorization.

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PUBLIC KEY INFRASTRUCTURE&

SSL PROTOCOL It is cryptographic term, demonstrate

an arrangement of binding the user’s public key to its Certification Authority.

Secure Socket Layer protocol is used to made an encrypted communication between web server and browser.

Generated Private key is stored in the browsers pool and public key will be sent to certification authority for signature.

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AMGA METADATA CATALOGUE SERVICE

Arda Metadata Grid Application Users needs an efficient mechanism to

describe and locate file over grid, can be done by adding attribute to file.

Metadata, is the list of attributes and there values associating with entries.

Based on lightweight and streamed protocol.

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GANGA THE JOB SUBMISSION TOOL It is frontend interface for users to

submit and manage jobs on grid environment.

GANGA Architecture contains * Client * Application Manager * Job Manager

* Job Repository and File workspace

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SRM-SRB SRB, Storage Resource Broker is a file

management system based on client-server architecture, support heterogeneous data storage resources.

SRM, Storage Resource Manager is protocol to manage storage resource and provide space management.

* Handling mapping between LFNs, GUIDs and SURLs. * NOT a file Access protocol.

* Provide uniform interface to heterogeneous storage resources

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Questions !!!

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Thank You .

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