System Administration Guide: Basic Administration


sun.com \| docs.sun.com	How To Buy \| My Sun \| Worldwide Sites

Previous Contents Index Next Next

How to Stop CacheFS Logging

Use the cachefslog -h option to stop logging.

$ cachefslog -h /mount-point

The following example shows how to stop logging on /home/stuff.

$ cachefslog -h /home/stuff
not logged: /home/stuff

If you get a system response other than the one specified here, you did not successfully stop logging. Check to see if you are using the correct log file name and mount point.

How to View the Working Set (Cache) Size

You might want to check if you need to increase the size of the cache. Or, you might want to determine what the ideal cache size is based on your activity since you last used the cachefslog command for a particular mount point.

Become superuser on the client system.

View the current cache size and highest logged cache size.
# cachefswssize log-file-path
For more information, see cachefswssize(1M).

Example--Viewing the Working Set (Cache) Size

In the following example, the end size is the size of the cache at the time you issued the cachefswssize command. The high water size is the largest size of the cache during the time frame in which logging occurred.

# cachefswssize /var/tmp/samlog
 
    /home/sam
	       end size:  10688k
	high water size:  10704k
 
    /
	       end size:   1736k
	high water size:   1736k
 
    /opt
	       end size:    128k
	high water size:    128k
 
    /nfs/saturn.dist
	       end size:   1472k
	high water size:   1472k
 
    /data/abc
	       end size:   7168k
	high water size:   7168k
 
    /nfs/venus.svr4
	       end size:   4688k
	high water size:   5000k
 
    /data
	       end size:   4992k
	high water size:   4992k
 
    total for cache
	   initial size: 110960k
	       end size:  30872k
	high water size:  30872k

Viewing CacheFS Statistics

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

Table 41-2 CacheFS Statistics Terminology

Output Term	Description
`cache 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 is not in the cache. The load on the server is the sum of cache misses, consistency checks, and modifications (modifies).
`consistency 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 CacheFS Statistics

View the statistics with the cachefsstat command. You can view the statistics 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 CacheFS 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.

For more information, see cachefsstat(1M).

Example--Viewing CacheFS Statistics

This example shows how to view statistics on the cached file system, /home/sam.

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

Previous Contents Index Next Next