Table of Contents
Day-2
PPT Slide
Architecture and Object Model
Legion philosophy
Flexibility and extensibility
Legion Object Model
The object model
Core Object Classes
Host objects
Vaults
Class roles and responsibilities
For example...
Classes are objects too
Naming
Legion Object Identifiers (LOID)
Object Addresses
Binding Agents
Typical binding process
Binding failure
binding failure (2)
Legion Security “You can’t build a fence around a global system”
Flexibility
Performance
Trust
Ease of Use
Scalability
Compatibility
Access Control Predicates
Key Distribution
Security and System Configuration
Running Legion at a site
Option 1 Single Generic User
Single User Issues
Basic Issues
An Alternate Picture
Design Properties
Must be careful
Process Control Daemon (PCD) Interface
PCD Implementation
PCD Status
Option 2 - Generic Accounts
Option 3 - Use native user id
We have three choices
PCD Unix Host Object
Object Activation
Object Deactivation
New commands
Creating a PCD Host
The Care and Feeding Of a Legion System Legion 1.6.4
Outline
Before Starting a System
Starting a System
First time startup
Adding to an Existing System
Useful stuff
Other useful scripts
Shutting Down a System
Resource Management in Legion
Outline
Motivation and Philosophy
Motivation
Philosophy
Allocation via Negotiation
Allocation via Negotiation - Motivation
Realization of Allocation via Negotiation
Application-Specific Allocation
Application-Specific Allocation: Motivation
A Better Model: Application-Specific Allocation
Realization of Application-Specific Allocation
Allocation Process Model
Allocation Process
Allocation Decision Process
Legion Approach to Resource Management
Legion Approach
Legion Approach
Resource Management Layers
Resource Management Layers
PPT Slide
The Players
Legion Information Framework
Information Framework
Legion Collection Objects
Simple Collection Interface
Collections and Scheduling
Allocation Enactment
The Players: Interfaces
The Players: Interfaces (cont'd)
Placement Enactment
Steps in Object Placement
Locate Resources
Gather Description Information
Placement Decision
Implement Decision
Reflective Graph Event Model
Reflection
Self-Representation
Graphs
Implicit Parameters
Graph annotations
Events
Events
Protocol Stack
Events & Handlers
Adding new component
Events Recap
Graphs & Events
Graphs as Event Handlers
Event Remote Notification
Special case: Exception Propagation
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