Active Refresh Bytes Rate (KB/Sec)

Measures the rate at which bytes of data are retrieved from the Internet to actively refresh popular Uniform Resource Locators (URLs) in the cache. This will relate to the configuration set for active caching.

Active URL Refresh Rate (URL/Sec)

Measures the rate at which popular cached URLs are actively refreshed from the Internet. This will relate to the configuration set for active caching.

Disk Bytes Retrieve Rate (KB/sec)

This counter measures that rate at which "bytes of data" are retrieved from the disk cache. This counter is similar to Disk URL Retrieve Rate, but monitors bytes, rather than URLs.

Disk Cache Allocated Space(KB)

Measures how much space is being used by the disk cache. It will be equal to or less than the amount configured for the disk cache.

Disk Content Write Rate (Writes/Sec)

Measures the number of writes per second to the disk cache for the purpose of writing URL content to the cache disk.

Disk Failure Rate (Fail/Sec)

Measures the number of input/output (I/O) failures per second. An I/O failure occurs when ISA Server fails to read from or write to the disk cache. This counter, together with Total Disk Failures, will give a clear indication of disk cache problems.

Disk URL Retrieve Rate (URL/Sec)

Measures how many URLs are sent to clients from the disk cache in one second. This is a useful counter to measure at peak and offpeak times to check how the disk cache is performing. It can be compared with Memory URL Retrieve Rate to see how cache disk and memory are being utilized.

Max URLs Cached

Measures the maximum number of URLs that have been stored in the cache.

Memory Bytes Retrieved Rate (KB/Sec)

Measures the rate at which bytes of data are retrieved from the memory cache. This counter is similar to Memory URL Retrieve Rate, but monitors bytes, rather than URLs.

Memory Cache Allocated Space (KB)

Measures how much space is being used by the memory cache. It should be equal to or less than the amount configured for the memory cache.

Memory URL Retrieve Rate (URL/Sec)

Measures how many URLs are sent to clients from the memory cache in one second. This is a useful counter to measure at peak and offpeak times, to check how the memory cache is performing and whether available memory allocated for caching purposes is being used efficiently.

Memory Usage Ratio Percent (%)

Shows the ratio between the amount of cache fetches from the memory cache in a percentage and the amount of cache fetches in total. A high percentage may indicate that it is worthwhile allocating more available memory resources to the cache. A low counter may indicate that memory resources may be better used elsewhere.

Total Actively Refreshed URLs

Displays the cumulative number of popular URLs in the cache that have been actively refreshed from the Internet. This counter will give an indication of active caching performance.

Total Bytes Actively Refreshed (KB)

Displays the total number of bytes that have been retrieved from the Internet to actively refresh popular URLs in the cache. This counter will give an indication of active caching performance.

Total Disk Bytes Retrieved (KB)

Measures the cumulative number of disk bytes that have been retrieved from the disk cache. This counter, added to Total Memory Bytes Retrieved (KB), will indicate the total number of bytes retrieved from the cache.

Total Disk Failures

Measures the number of times that the Web Proxy service failed to read from or write to the disk cache due to an input/output (I/O) failure. A low counter will indicate that a disk is performing properly. A high counter will indicate a cache disk that is too small, too slow, or corrupted.

Total Disk URLs Retrieved

Measures the cumulative number of URLs that have been retrieved from the disk cache. This counter, added to Total Memory URLs Retrieved, will indicate the total number of URLs retrieved from the cache.

Total Memory Bytes Retrieved (KB)

Measures the cumulative number of memory bytes that have been retrieved from the memory cache in response to client requests to the cache. A low number might indicate that memory resources dedicated to the cache are not being used efficiently. A high number might indicate that more memory resources should be allocated to the cache.

Total Memory URLs Retrieved

Measures the cumulative number of URLs that have been retrieved from the memory cache in response to client requests to the cache. A low number might indicate that memory resources dedicated to the cache are not being used efficiently. A high number might indicate that more memory resources should be allocated to the cache.

Total URLs Cached

Measures the cumulative number of URLs that have been stored in the cache. If this counter and URLs in Cache is low, it may indicate a problem with the cache. The cache may not be configured for optimal use or the cache size may be too small.

URL Commit Rate (URL/Sec)

Indicates the speed at which URLs are being written to the cache. If rate of this counter is comparable to the rate of Disk Failure Rate(Fail/Sec), it indicates that a high proportion of attempts to write to the cache are failing. This could indicate a problem with cache configuration, a cache disk that is too slow, or a cache size that is too small.

URLs in Cache

Measures the current number of URLs in the cache.