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I am new to Linux and I am having to manage a RHEL 5 server. I am loving the server, except for in the last couple of days the server has completely froze and I am unable to log in at the console nor am I able to connect to it via SSH. Once I force a shut down and restart the server, everything is fine. Where could I look to see what happen to the server? Is there a tool I can use?
i don't have sar installed so I wasn't able to show me the results using that command. I was able to see the memory utilization using 'top', and it looks like my main application which is nsm (juniper network security manager) is using most of it.
the screen freezing, is that indication that I don't have enough memory on the server?
Not necessarily. It simply means that that application is currently using the most memory. What is your swap usage and what is the output of `free -m`? If your swap usage is low and you see lots of processes in the D state you may be thrashing which would indicate that you need more memory or to reduce memory usage on your server.