System Administration Guide, Volume 1

Viewing the Statistics

You might want to view certain information about a specific cached file system. The following table explains the terminology displayed in the statistics output.

Table 37-4 Statistics Output Terminology


Output Term	Description
`hit rate`	The rate of cache hits versus cache misses, followed by the actual number of hits and misses. A cache hit occurs when the user wants to perform an operation on a file or files, and the file or files are actually in the cache. A cache miss occurs when the file was not in the cache. The load on the server is the sum of cache misses, consistency checks, and modifications (modifies).
`checks`	The number of consistency checks performed, followed by the number that passed, and the number that failed.
`modifies`	The number of modify operations; for example, writes or creates.

How to View Cache Statistics

View the statistics with the cachefsstat(1M) command. You can do this at any time. For example, you do not have to set up logging in order to view the statistics.

$ cachefsstat mount-point

mount-point

Specifies the cached file system for which you want to view the statistics.

If you do not specify the mount point, statistics for all mounted CacheFS file systems will be displayed.

Example--Viewing Cache Statistics

$ cachefsstat /home/sam
	    cache hit rate: 73% (1234 hits, 450 misses)
	consistency checks: 700 (650 pass, 50 fail)
	          modifies: 321
garbage collection:  0