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Full Discussion: RHEL Memory issue
Operating Systems Linux Red Hat RHEL Memory issue Post 302976990 by baluchen on Sunday 10th of July 2016 10:53:26 AM
Old 07-10-2016
RHEL Memory issue
Friends,

I have 8CPU/24gb RAM in my Linux servers around 30+. All the servers are running with Java based application with NFS mounted.

The problem what I have is, When I reboot servers the server memory looks decent. But after some time the "cached" memory increasing and "free" memory getting reduced and reaching some mega bytes. I searched in various forums that it is behavior for RHEL and there wont be any performance issue. But I see better performance when there is more memory available in "free". The same performance goes down when the "free" memory reach 300mb.

Code:
$ free -g
             total       used       free     shared    buffers     cached
Mem:            23         23          0          0          0          9
-/+ buffers/cache:         13         10
Swap:            1          0          1
$ free -m
             total       used       free     shared    buffers     cached
Mem:         24248      23756        492          0        233       9684
-/+ buffers/cache:      13838      10409
Swap:         2047        214       1833
$

I need your expert advice why the cached memory is increasing.. and how I set threshold so that I will always have 1-2gb free.?

Thank you
Bala
 

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LEARN ABOUT DEBIAN

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 Red Hat Network
       (or Spacewalk) website isn't required.

OPTIONS

       -l, --list
	      Print a list of channel(s) 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, RHN 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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