Easy Notes of Cloud Computing unit- 3 @Computer Diploma

Description

3.1 & 3.2 Cloud Storage & VDC Architecture

• Cloud Storage Architecture:

  • Layers: Frontend (API/UI), Control (Management), Backend (Physical Storage), Network.

  • Types: Block (for databases), File (NFS/SMB), Object (S3, unstructured data).

• Virtual Data Center (VDC):

  • Concept: A pool of cloud-based resources (compute, memory, storage) that acts as a traditional data center.

  • VDC Components: Virtual Servers (VMs), Virtual Storage (SAN/NAS), Virtual Networking (VLAN/VXLAN).

  • Benefits: Cost-efficient (OpEx), agile, highly resilient, and scalable.

3.3 Cloud File Systems (GFS & HDFS)

3.4 Federated Cloud Computing

• Definition: Interconnecting multiple cloud providers to create a “universal” cloud.

• Model Components:

  • Cloud Broker: Finds the best provider for the user.

  • Cloud Coordinator: Manages local resources and external requests.

  • Cloud Exchange: The marketplace where brokers and coordinators negotiate.

• Keywords: Interoperability, Resource Migration, No Vendor Lock-in, Scalability.

3.5 – 3.8 Service Level Agreement (SLA)

SLA: A legal contract between provider and user defining service quality (e.g., 99.9% uptime).

• Types of SLA:

  • Infrastructure SLA: Focuses on hardware, network uptime, and power.

  • Application SLA: Focuses on software performance, latency, and throughput.

• 5 Phases of SLA Management:

  1. Feasibility: Assessing if the provider can meet technical/financial goals.

  2. On-Boarding: Migrating the application to the cloud environment.

  3. Pre-production: Testing and validating the SLA in a sandbox.

  4. Production: Real-time execution and performance monitoring.

  5. Termination: Ending the contract and safely retrieving data.

• 5 Phases of SLA Life Cycle:

  1. Contract Definition: Drafting the terms.

  2. Publishing/Discovery: Provider lists the service; user finds it.

  3. Negotiation: Finalizing terms and penalties.

  4. Operationalization: Monitoring and enforcement.

  5. De-commissioning: Closing the agreement.

3.9 Cloud Service Life Cycle Phases

1. Service Planning: Identifying user needs and resource requirements.

2. Service Creation: Development, configuration, and deployment.

3. Service Operation: Day-to-day management, maintenance, and support.

4. Service Termination: Retirement of the service and data archiving/deletion.

Quick Recall Keywords for Exam:

• Metadata: Data about data (stored in Master/NameNode).

• Domino Effect: A failure in one node affecting others (prevented by isolation).

• Penalty Clause: Compensation paid by the provider if the SLA is breached.

• VDC: Software-defined data center.