If all the data fits in the cache, then the data is read from disk only once; after that, all requests are satisfied from the cache at memory speed.
如果所有数据都在缓存中，那么只需从磁盘读取一次数据；毕竟，所有的请求都可以用内存速度从缓存中得到满足。
This smaller memory is called cache RAM and allows the microprocessor to execute at full speed.
这些小型内存芯片叫快取内存，能让微处理器达到最快速度。
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。
If the data is there, then you have a cache hit and you get the item you want at memory speed (tens of a nanosecond).
如果存在数据，您就得到一次缓存命中(cache hit)，并以内存速度获取项(几十纳秒)。
Thus, a write-behind cache gives you memory speed for accessing data on all writes, and for all cache-hit reads, and has other benefits that you will see later.
因此，write - behind缓存在访问所有写入数据以及所有缓存命中读取时都能提供内存速度，而且还有一些其他好处，我们将在下文介绍。
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。
Cache as much as possible. Use memcached - memcached is a high-performance memory object caching system intended to speed up dynamic web applications by alleviating database load.
尽量做缓存，可使用memcached . memcached是一款高性能的内存对象缓存系统，可用来加速动态Web应用程序，减轻数据库负载。
Cache as much as possible. Use memcached - memcached is a high-performance memory object caching system intended to speed up dynamic web applications by alleviating database load.
尽量做缓存，可使用memcached . memcached是一款高性能的内存对象缓存系统，可用来加速动态Web应用程序，减轻数据库负载。
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