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Caching is one of the most effective and commonly used mechanisms to improve performance of storage servers. Replacement policies play a critical role in the cache design due to the limited cache capacity. Recent researchers devote themselves to achieve high hit ratios, but rarely pay attention to reducing miss penalty during the design of a replacement policy. To address the issue, this paper presents...
Current cache replacement policies mostly work at the block device level. Block level policies try to achieve better hit ratio by balancing the frequently and recently visited pages, however, further improvements can be realized by using file-system metadata. There are two reasons for this. First, sequential access of disk data is more quickly than non-sequential access, that is to say, the cache...
Ever since a long time ago, recency and frequency are not to be sneezed at design of cache management policy. Meanwhile, hit ratio is used to estimate whether a cache replacement policy is good or not. The influence of miss penalty on cache performance is neglected incorrectly. In fact, the cache miss penalty can vary by almost one or two orders of magnitude among different policies because of tremendous...
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