<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.3354" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2>We have recently installed Redhat AS4 throughout our network. I have installed various plugins from the Nagios Exchange site for Linux and all seems to be well, except for the check_ram command. I am running this on various servers with different configurations and all are giving the same results. Here is what I have on one of the servers:</FONT></SPAN></DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2>check_ram -n -w 20MB -c 10MB ( the system has 8GB installed), results display 30MB free (am I doing this right?)</FONT></SPAN></DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2>Other admins here are disputing the results and claim that Linux buffers all the memory and gives what it needs. I don't know for fact it this is true. I have also run top, free and ps -eo checking on memory size, all give back the same results as the Nagios plugin. Is this plugin with the option chosen giving real memory results or bogus results.</FONT></SPAN></DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2>My question, in desperation, can anyone explain in very simple terms how Linux memory works? Also how are you monitoring memory, using what command and how it is configured etc.</FONT></SPAN></DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2>Thanks to all</FONT></SPAN></DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=328113314-22082008><FONT face=Arial size=2>Ed</FONT></SPAN></DIV></BODY></HTML>