ScalabilityAvailability

Scalability & Availability Paul Greenfield

Building Real Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scalable ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Available ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Performance Measures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Response Time ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Throughput ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

System Capacity? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scaling Out ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

‘ Load Balancing’ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Static Load Balancing Client Client Client Name Server Server process Load balancing across application process instances within a server Server process Advertise service Request server reference Return server reference Call server object’s methods Get server object reference

Load Balancing in CORBA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Name Servers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Dynamic Stateful? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BEA WLS Load Balancing Clients Clients DBMS MACHINE B MACHINE A EJB Cluster HeartBeat via Multicast backbone EJB Servers instances EJB Servers instances

Threaded Servers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Threaded Servers Client Client Client App DLL COM+ COM+ process Thread pool Shared object space Application code COM+ using thread pools rather than load balancing within a single system

Dynamic Load Balancing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web Server Farms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Clusters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Clusters Client PCs Server A Server B Disk cabinet A Disk cabinet B Heartbeat Cluster management

Scaling State Stores? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scaling State Stores ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scaling Out Summary Districts 11-20 Districts 1-10 Web server farm (Network Load Balancing) Application farm (Component Load Balancing) Database servers (Cluster Services and partitioning) UI tier Business tier Data tier

Scale-up ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scale-up ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Available System Web Clients Web Server farm Load balanced using WLB App Servers farm using COM+ LB Database installed on cluster for high availability

Availability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Availability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Redundancy=Availability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transaction Recovery ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fragility ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ScalabilityAvailability

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ScalabilityAvailability