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This test monitors the Web Proxy cache. The ISA server implements a cache of frequently-requested objects to improve network performance. You can configure the cache to ensure that it contains the data that is most frequently used by the organization or accessed by your Internet clients. The measures made by the test are as follows:

Measurement	Description	Measurement Unit	Interpretation
Disk_cache_space	The amount of space used by the disk cache	KB	If the value of this measure grows closer to or equal to the allocated disk cache space, it would indicate that subsequent cache requests might be rejected due to non-availability of adequate cache space. This, in turn, would increase the rate of direct disk accesses, which will consequently degrade system performance.
Memory_cache_space	The amount of space used by the memory cache	KB	An excessive consumption of the memory cache space would result in slow-down of the system. This is because the lack of sufficient space in the memory cache would cause the real memory (RAM) to directly service the requests for objects.
URL_commit_rate	The speed at which URLs are being written to the cache	URLs/Sec