Horizontal scaling vs Vertical

Could some one please give me an example of horizontal scaling

... and an example of vertical scaling

Thanks
Anthony LuciaAsked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
What is the context for this question? Horizontal and vertical are quite generic terms you know.
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madunixCommented:
Horizontal scaling such as one master, multiple slaves, horizontally scaling increase scalability using load-balancing strategies to treat clusters of servers as single logical units.

In IBM stated:
http://pic.dhe.ibm.com/infocenter/brdotnet/v7r1/index.jsp?topic=%2Fcom.ibm.websphere.ilog.brdotnet.doc%2FContent%2FBusiness_Rules%2FDocumentation%2F_pubskel%2FRules_for_DotNET%2Fps_RFDN_Global397.html

http://pic.dhe.ibm.com/infocenter/pim/v9r1m0/index.jsp?topic=%2Fcom.ibm.pim.adm.doc%2Fsys_admin%2Fpim_con_appserverhorizscaling.html

Vertical scaling
Vertical scaling, also described as scale up, typically refers to adding more processors and storage to an Symmetric Multiple Processing to extend processing capability. Generally, this form of scaling employs only one instance of the operating system.

Horizontal scaling
Horizontal scaling, or scale out, usually refers to tying multiple independent computers together to provide more processing power. Horizontal scaling typically implies multiple instances of operating systems, residing on separate servers.
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Gerwin Jansen, EE MVETopic Advisor Commented:
A more basic example: adding extra discs to a NAS with empty bays is vertical scaling. When all bays are full (and max. sized discs are placed), you buy an extra NAS, this is horizontal scaling.
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