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What is Scale-out?

A way of raising the processing capacity of a whole system by adding servers and sharing the processing among them. Compared with scale-up, which makes the parts of one server faster, capacity is easier to add and redundancy is gained, but the system must be designed so that the processing can be divided. Reducing the number of servers is called scale-in.

Japanese name: スケールアウト

Scale-out appears in 1 practice question across 1 topic, including System Architecture and Reliability.

Field: System Architecture and Reliability

Try it: questions about Scale-out

Among the ways to increase a system's processing capacity, which corresponds to scale-out?

  1. AIncreasing the number of servers with the same configuration and distributing the processing with a load balancer
  2. BReplacing a server's CPU with a faster one and adding memory
  3. CReducing the number of servers to raise the utilization of each
Show answer and explanation

Answer: A. Increasing the number of servers with the same configuration and distributing the processing with a load balancer

Scale-out increases the processing capacity of the whole system by adding servers and sharing the processing among them. Capacity can be added simply by adding servers, and processing continues on the rest if one fails, but the system must be designed so that the processing can be divided. Making the parts of one server faster is scale-up, which is simple to configure but limited by the performance one server can achieve. Reducing the number of servers is called scale-in.

Scale-out in the explanations

Questions that mention Scale-out (1)

  1. Among the ways to increase a system's processing capacity, which corresponds to scale-out?

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Related terms

Differential backup Dual system Duplex system Fail-safe Fail-soft Fault tolerance Fool-proof Hot standby Incremental backup Load balancer

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