Performance degradation occurs, when the server newly thrown into operation receives the same amount of workload as one in the steady-state operation due to "cold caches". Usually, data access is uneven, namely, some data are accessed more frequently than others. In this paper, transient behavior of the server newly thrown into operation has been analyzed on the basis of cache hit rate for uneven data access. Server response time has been formalized theoretically to a Zipf distribution access in a disk cache system with 2-levels, namely, content and directory caches. Experimental results on web servers, show that measured and theoretically calculated response times coincide well.
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