Feature of the LUN variable prefetch policy

1. After receiving a data read request, the storage system prefetches data to the cache based on a multiple of the read length specified in the I/O request.
2. This policy applies to sequential read applications with variable-size data or to multi-user concurrent read applications with an unknown data prefetch amount, for example, multi-user Video on Demand (VOD) initiated by users at different bit rates.

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