UNIT 2 - GRID SERVICES (1).pdf

The gsr for an instance can change over the lifetime

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The GSR for an instance can change over the lifetime of the service. The OGSA employs a “handle - resolution” mechanism for mapping from a GSH to a GSR. The GSH must be globally defined for a particular instance.
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Grid Service Migration This is a mechanism for creating new services and specifying assertions regarding the lifetime of a service. The OGSA model defines a standard interface, known as a factor, to implement this reference. Any service that is created must address the former services as the reference of later services. The factory interface is labeled as a Create Service operation. This creates a requested grid service with a specified interface and returns the GSH and initial GSR for the new service instance.
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OGSA Security Models The OGSA supports security enforcement at various levels.
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The grid works in a heterogeneous distributed environment, which is essentially open to the general public. We must be able to detect intrusions or stop viruses from spreading by implementing secure conversations, single logon, access control, and auditing for nonrepudiation. At the security policy and user levels, we want to apply a service or endpoint policy, resource mapping rules, authorized access of critical resources, and privacy protection. At the Public Key Infrastructure (PKI) service level, the OGSA demands security binding with the security protocol stack and bridging of certificate authorities (CAs), use of multiple trusted intermediaries, and so on. Trust models and secure logging are often practiced in grid platforms.
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FUNCTIONALITY REQUIREMENTS The development of the OGSA document has been based on a variety of use case scenarios. The use cases have not been defined with a view to expressing formal requirements but have provided useful input to the definition process. Basic Functionality Requirements Security Requirements Resource Management Requirements System Properties Requirements Other Functionality Requirements
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Basic Functionality Requirements Discovery and brokering Metering and accounting Data sharing Deployment Virtual organizations Monitoring Policy
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Security Requirements Multiple security infrastructures Perimeter security solutions Authentication, Authorization, and Accounting Encryption Application and Network-Level Firewalls Certification
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Resource Management Requirements Provisioning Resource virtualization Optimization of resource usage Transport management Access Management and monitoring Processor scavenging Scheduling of service tasks Load balancing Advanced reservation Notification and messaging Logging Workflow management Pricing
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System Properties Requirements Fault tolerance Disaster recovery Self-healing capabilities Strong monitoring Administration Agreement-based interaction Grouping/aggregation of services
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Other Functionality Requirements Platforms Mechanisms Administrative environments
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