Plugin GC Lec4

7/29/2019 Plugin GC Lec4

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Seminar Review


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Topics

Grid Computing Middleware

Grid Resource Management

Grid Computing Security

Applications of SOA and Web Services Semantic Grid

Grid & E-Science

Grid Economics Cloud Computing


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Grid Computing Middleware

Definitions & functions

Middleware components

Globus

gLite


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What is Grid middleware?

System software between applications and OS

Provide services to applications Discovery

Execution

Storage Data movements

Information

Service integration

Failure detection and recovery

Resource monitoring

Hide all complexities of the Grid environment


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Purposes of Middleware

Open, general-purpose and standard

Standard protocols Defines the contents and sequence of message

exchanges used to request remote operation

Important and essential to achieve the interoperabilitythat Grid depends on

Standard APIs Interfaces to code libraries

Facilitate construction of Grid components by allowingcode components to be reused


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Middleware Components


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Globus layered architecture

Applications

Core ServicesMetacomputing

DirectoryService

GRAMGlobusSecurityInterface

HeartbeatMonitor

Nexus

Gloperf

LocalServices

LSF

Condor MPI

NQEEasy

TCP

SolarisIrixAIX

UDP

High-level Services and Tools

POP-C++ globusrunMPI Nimrod/GProActive

CC++

GlobusView Testbed Status

GASS


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Globus Toolkit 4x

Sustainable changes on the services

interoperability and infrastructure Open Grid Services Architecture (OGSA)

Stateful Web Services

Enable the integration of userspecific Grid services Define standard interfaces

How to access Grid services Disadvantage

Slow


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GT: Core servicearchitecture


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Globus Toolkit

Grid Service Specification

How to write, publish and use a Grid service GT components:

GT core

Meta-services used to implement other services andservice behaviors (e.g. service creation, destruction)

GT base services Use the GT core to implement Grid capacities:

resource management, information services, datatransfer, etc.

Other Grid services Implemented by user to enable some enhancement

capacities


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GT: from other perspectives

GT containerGT security

Local-level services

WS GRAM Fork PBS

LSF GridFTP RFTP

VO-level services

Information service???

crea

te

create


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What GT DOES NOT address

GT focus on accessing local resources

Things still missing Coordination services

Resource/service discovery

Information collection

Resource connectivity

Programming models/tools Things to be improved

Performance!


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gLite Toolkit

The Enabling Grids for E-sciencE project(EGEE)

Middleware stack that combines componentsdeveloped in various related projects.


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gLite - guiding principles

Service oriented approach

Allow for multiple interoperable implementations Lightweight (existing) services

Easily and quickly deployable

Use existing services where possible Condor, EDG, Globus, LCG,

Portable Being built on Scientific Linux and Windows

Security Sites and Applications


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gLite - guiding principles

Performance/Scalability & Resilience/Fault

Tolerance Comparable to deployed infrastructure

Co-existence with deployed infrastructure

Co-existence with LCG-2 and OSG (US) are essential forthe EGEE Grid services

Site autonomy Reduce dependence on global, central services

Open source license


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Grid Resource Management

Definitions

Functions

Resource Management Models


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Plugin GC Lec4

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