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i wish to clear memory cache on a production box and i was wondering what is the worst that can happen if i do?
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Hi,
We are working on OEL5.7 (Oracle Linux) OS. We have a server with 64GB RAM. When we issue free -m command which shows the used, available and cached space. Most of the space is shown in cached section, where as we are not really doing much activity on the server.
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18:45:47 # free -m
total used free shared buffers cached
Mem: 96679 95909 770 0 1530 19550
-/+ buffers/cache: 74828 21851
Swap: 12287 652 11635
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9. UNIX for Advanced & Expert Users
hi,
What is the difference between UBC cache and Metadata cache ? where can i find UBC cache Hits and Metadata cache Hits in hp-ux?
Advanced thanx for the help. (2 Replies)
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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)