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Operating Systems Solaris Monitoring Paging and Swapping Post 303024827 by javanoob on Wednesday 17th of October 2018 01:31:12 PM
Old 10-17-2018
Quote:
Originally Posted by jlliagre
Check the cache hit ratio to see how efficient it is. The closer to 100%, the better.

If you can fit all the files you use in RAM (hit rate 100%) and still have room enough for the applications and other consumers RAM usage, go for it and set the ZFS ARC size to be able to host everything.

On the opposite and more likely situation, that's a trade off and you should measure usage, do tests that last a few days or more, see how your RAM is used, see how performance is impacted by giving more memory to the cache or more memory to the applications, and act accordingly.
Hi Jilliagre,


Sorry for asking.. where/how do i see the cache hit for ZFS ARC...


Regards,
Noob
 

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cachefsstat(1M) 					  System Administration Commands					   cachefsstat(1M)

NAME
cachefsstat - Cache File System statistics SYNOPSIS
/usr/bin/cachefsstat [-z] [path...] DESCRIPTION
The cachefsstat command displays statistical information about the cache file system mounted on path. The statistical information includes cache hits and misses, consistency checking, and modification operations. If path is not specified, all mounted cache file systems are used. cachefsstat can also be used to reinitialize this information (see -z option). The statistical information has the following format: <cache hit rate> <consistency checks> <modifies> where: hit rate The percentage of cache hits over the total number of attempts, followed by the actual numbers of hits and misses. 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, including writes, creates, etc. OPTIONS
The following option is supported: -z Zero (reinitialize) statistics. Execute cachefsstat -z before executing cachefsstat again to gather statistics on the cache per- formance. This option can only be use by the superuser. The statistics printed reflect those just before the statistics are reinitialized. USAGE
See largefile(5) for the description of the behavior of cachefsstat when encountering files greater than or equal to 2 Gbyte (2**31 bytes). EXAMPLES
Example 1: Using cachefsstat The following example shows the cachefsstat command run on file system /test: example# cachefsstat /test /test cache hit rate: 100% (0 hits, 0 misses) consistency checks: 0 (0 pass, 0 fail) modifies: 0 garbage collection: 0 EXIT STATUS
The following exit values are returned: 0 Successful completion. non-zero An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cachefslog(1M), cachefswssize(1M), cfsadmin(1M), attributes(5), largefile(5) SunOS 5.10 9 Oct 2003 cachefsstat(1M)
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