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Full Discussion: ZFS Filesystem
Operating Systems Solaris ZFS Filesystem Post 302954533 by jlliagre on Tuesday 8th of September 2015 06:19:00 PM
Old 09-08-2015
Quote:
Originally Posted by achenle
4 GB cache is more than enough. I seriously doubt it impacted performance.
Well, the 4GB ARC is now full but while uncapped, it used to contain three times more data (12.9GB).

It is not possible to know how much this cache size reduction does affect performance without getting at least hits and miss statistics but if there is a large increase in misses, the performance impact might be huge.
 

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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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