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Old 02-10-2012
Linux cache
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.

It's like cached is somewhere around 23GB, how can we see what is in it which is cached and how do we clear it?

Thanks and Regards!
 
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LEARN ABOUT OPENSOLARIS

cachefsd

cachefsd(1M)						  System Administration Commands					      cachefsd(1M)

NAME

       cachefsd - CacheFS daemon

SYNOPSIS

       /usr/lib/fs/cachefs/cachefsd

DESCRIPTION

       The  cachefsd  server  implements  features  of the cache filesystem (CacheFS). It is invoked at boot time and run if the / (root) and /usr
       filesystems are being cached. If /usr is being cached, cachefsd is invoked by inetd(1M)	from  inetd.conf(4).  At  run  time,  cachefsd	is
       invoked by the inetd mechanism in response to an RPC request from a user command such as mount_cachefs(1M).

       The  cachefsd  server  supports	the "disconnected mode" of CacheFS. In this mode, a user can continue to read and, depending on the option
       selected, write to files in a cached filesystem when the NFS server for the cached files is not available.

       The cachefsd daemon performs the following functions in support of the CacheFS:

	   o	  Implements the connection policy. The daemon determines whether the NFS server backing the cache is  connected  or  disconnected
		  from the cache, or is in transition from the connected or disconnected states.

	   o	  Implements "log rolling," wherein the daemon monitors a disconnected NFS server for reconnection. After such a server returns to
		  a connected state, cachefsd rolls any local changes to cached files (kept in a log) back to the server.

	   o	  Manages "packing," wherein cachefsd makes a best effort to ensure that files in a user-specified list are available in the cache
		  in disconnected mode.

	   o	  Supports  user interfaces by supplying statistics, reporting conflicts between the cache and the back filesystem, and supporting
		  a list of files for packing.

       The running of cachefsd is required for the disconnected mode of CacheFS.

OPTIONS

       The following options are supported:

       -r    Used for invoking cachefsd for the / filesystem.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cachefspack(1M), cfsadmin(1M), mount_cachefs(1M), inetd.conf(4), attributes(5)

SunOS 5.11							  2 October 2000						      cachefsd(1M)