Try running "dmesg" to see if you have any "panic" messages. Also see if there are any files in /var/crash/<nodename>. If there are core files in this directory, it may indicate some kind of kernel problem with the server.
Hello Iqbal7,
Has your system crashed before or is this the first time? When was it previously rebooted (last reboot| head -2), was it running slowly? Have you enough resources (vmstat -2) or has something changed recently. What o/s are you running? There are many questions you should ask...these are just a few.
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