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Full Discussion: Re-start of RHEL server
Operating Systems Linux Red Hat Re-start of RHEL server Post 302779293 by lupin..the..3rd on Tuesday 12th of March 2013 12:45:26 PM
Old 03-12-2013
There are two kinds of "cache" that can and will consume all your free memory - and it's a good thing.

The first is I/O buffers. This is a cache for moving data around. If you're moving 100 GB from one physical disk to another, that data is going through this I/O buffer space. It allows for more efficient multitasking. The read disk fills the buffer, and the write disk gets its data from the buffer. It's an efficient way of doing things.

The second is file cache. This is a filesystem read cache. Frequently accessed files are stored in this read cache to make accessing them quicker.

Both are tuned and managed automatically by the kernel. There is no user intervention required. There is no need to reboot to "clear" them. If you start up a new program that requires a lot of memory, the kernel will prune the I/O buffer and the file cache automatically to make room for your new program.

You can completely ignore I/O buffer and file cache for memory usage purposes. Count only the system + user space. Take your "used" total, and subtract file cache and buffer space, and the resulting number should = system + user.
 

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LEARN ABOUT CENTOS

rhn-channel

SPACEWALK-CHANNEL(8)						   Red Hat, Inc.					      SPACEWALK-CHANNEL(8)

NAME

       spacewalk-channel - Subscribe to or unsubscribe system from channel.

SYNOPSIS

       spacewalk-channel [options]

DESCRIPTION

       spacewalk-channel  allows  you  to  subscribe  to  and  unsubscribe from specified channels via the command line. A visit to the "Spacewalk
       Server", "Red Hat Satellite" or "Red Hat Network Classic" website isn't required.

OPTIONS

       -l, --list
	      Print a list of channel(s) that you are currently subscribed to.

       -b, --base
	      Print a base channel that you are currently subscribed to.

       -L, --available-channels
	      Print a list of all available child channels.

       -a, --add
	      You are subscribing system to given channel(s). You have to specify --user and --password.

       -r, --remove
	      You are unsubscribing system to given channel(s). You have to specify --user and --password.

       -u, --user
	      Your username used to register the system with and for Red Hat Network Classic, Red Hat Satellite or Spacewalk.  If you do not enter
	      this option and it is required, you will be prompted.

       -p, --password
	      The  password  associated  with the username specified with the --user option. This is an unencrypted password.  If you do not enter
	      this option and it is required, you will be prompted.

       -c, --channel
	      Label of channel you want to subscribe to or unsubscribe from. Can be specified multiple times.

       -v, --verbose
	      Print out successfull action.

       -h, --help
	      Show a help message and exit.

NOTE

       The addition and removal of channels is mutually exclusive, please use the command twice.

EXAMPLES

       Subscribe to two channels:

	      spacewalk-channel --add -c rhn-tools-rhel-i386-server-5 -c rhel-i386-server-vt-5 --user username --password password

       Unsubscribe from channel:

	      spacewalk-channel --remove -c rhn-tools-rhel-i386-server-5 -c rhel-i386-server-vt-5 --user username --password password

       List subscribed channels:

	      spacewalk-channel --list

SEE ALSO

       rhnplugin(8), rhn_register(8), up2date(5).

AUTHORS

       Miroslav Suchy <msuchy@redhat.com>

BUGS

       Report bugs to <http://bugzilla.redhat.com>.

COPYRIGHT

       Copyright (C) 2009-2010 Red Hat, Inc.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

Linux								  2010 August 30					      SPACEWALK-CHANNEL(8)
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