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I/O contention (input/output contention) is the degradation of performance that occurs when a disk or virtual machine competes for I/O resources. I/O contentions are often seen in instances of heavy workloads when there is a high number of reads and writes, causing latency and bottlenecks. For example, the more virtual machines in an environment, the higher the risk for I/O contention. Storing heavily accessed files on the same disk will also increase the risk of contention.
In general, the word contention is used in computing to describe a situation in which two or more devices compete for the same resources.
See also: I/O blender
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