Because workloads with high Symmetrix cache read-hit rates are serviced at memory access speed, storing the data needed on EFDs may not result in a significant increase in performance.
因为具有高symmetrix缓存读中率的工作负载都是以内存访问速度实现的，所以在EFD中存储所需要的数据可能不会对性能有大的改进。
RAM cache is a portion of memory made of high- speed static RAM.
随机存储器缓存是由高速静态随机存储器组成的存储器的一部分。
To ensure the high speed, cache is made of static ram rather than dynamic ram used for the other part of the memory since this is slower.
为保证高速，“缓存”由静态内存构成而不是动态内存，因动态内存会稍慢。
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