How to operate/manage resources to meet certain objectives?

Horizontal Dynamic Scalability

1. Automated Scaling Listener  -monitors capacity.2. Listener takes decision based on pre-defined scaling policy.3. Listener replicates resources.

ELASTIC RESOURCE CAPACITY ARCHITECTURE

Dynamic provisioning of virtual servers

- Fluctuating processing requirements- Allocates and reclaims CPUs, RAMs- Run-time of virtual server is monitored- Additional resources leveraged before capacity threshold reached- Virtual server and It resources vertically scaled- Use Intelligent Automation Engine - sends scaling request to hypervisor or VIM

Main Components of Elastic Resource capacity arvhitecture.

SERVICE LOAD BALANCING ARCHITECTURE (CLOUD PROVIDERS)

A specialized variation of the workload distribution architecture for scaling cloud service implementations

Redundant cloud service deployments are created with a load balancer to dynamically distributes workloads.

2 types of load balancer:
- Independent of the cloud services and their host servers
- Built-in as part of application or server’s environment ( a primary server serves as a load balancer and communicates with neighboring servers to balance workload)

Cloud Bursting Architecture

Ø To meet higher usage demand, dynamic scaling or "bursts out" of on-premise resources to cloud based resourcesØ Cloud services are redundant, pre-deployed and inactive until cloud burstingØ Releases or "bursts in" to on-premise when no longer required(the reverse)Ø Based on:    - Automated scaling listener to redirect requests to cloud-based services    - Resource replication to maintain synchronicity between on-premise and cloud-based resources.

Elastic Disk Provisioning Architecture

- Typically, cloud consumers are charged based on fixed disk storage allocation- Aim - achieve dynamic storage provisioning and charge based on actual usage