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# Cache performance counters

Updated: February 1, 2011

Applies To: Forefront Threat Management Gateway (TMG)

The following table lists the performance counters for the Forefront TMG cache.

Performance counter Description

Bytes Retrieved Rate from Disk Cache (KB/sec)

The rate at which kilobytes of data are retrieved from the disk cache.

Bytes Retrieved Rate from Memory Cache (KB/sec)

The rate at which kilobytes of data are retrieved from the memory cache.

Disk Cache Allocated Space (KB)

The amount of space used for the disk cache (from the total disk space allocated for disk caching).

Disk Failure Rate (Fail/sec)

The number of I/O failures per second since the Firewall service started. An I/O failure occurs when Forefront TMG fails to read from or write to disk cache.

Disk Write Rate (writes/sec)

The number of writes to the disk cache, per second.

Max URLs Cached

The maximum number of URLs stored in the cache simultaneously since the Firewall service was started.

Max URLs Cached

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

Memory Cache Allocated Space (KB)

The amount of space used for the memory cache (from the total memory allocated for memory caching).

Memory Usage Ratio Percent (%)

The amount of fetches from the memory cache, in proportion to the total fetches from the cache.

Total Disk Failures

The number of times since the Firewall service started that Forefront TMG failed to read from or write to disk cache, due to an I/O failure.

Total URLs Cached

The cumulative number of URLs stored in the cache.

URL Commit Rate (URL/sec)

The rate at which URLs are stored to the cache.

URL Retrieve Rate from Disk Cache (URL/sec)