Scalability
It's the property of a system or application
to handle bigger amounts of work, or to be easily expanded, in response to
increased demand for network, processing, database access or file system
resources.
Horizontal scalability
a system scales horizontally, or out, when it's expanded by adding new nodes with identical functionality to existing ones, redistributing the load among all of them. SOA systems and web servers scale out by adding more servers to a load-balanced network so that incoming requests may be distributed among all of them. Cluster is a common term for describing a scaled out processing system.
a system scales horizontally, or out, when it's expanded by adding new nodes with identical functionality to existing ones, redistributing the load among all of them. SOA systems and web servers scale out by adding more servers to a load-balanced network so that incoming requests may be distributed among all of them. Cluster is a common term for describing a scaled out processing system.
Figure 1: Clustering
Vertical scalability
a system scales vertically, or up, when it's expanded by adding processing, main memory, storage, or network interfaces to a node to satisfy more requests per system. Hosting services companies scale up by increasing the number of processors or the amount of main memory to host more virtual servers in the same hardware.
a system scales vertically, or up, when it's expanded by adding processing, main memory, storage, or network interfaces to a node to satisfy more requests per system. Hosting services companies scale up by increasing the number of processors or the amount of main memory to host more virtual servers in the same hardware.
Figure 2: Virtualization
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