What is the role of cache in the storage system of data blocks?

What is the role of cache in the storage system of data blocks ？

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Take the answer 1：

Cache is a kind of semiconductor memory , Used to temporarily store data , In order to shorten the slave computing system to meet I/O The time taken to request , Caching prevents the computing system from being affected by delays related to disk drives , And improve the performance of the storage system .

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