What information do I need to investigate in case of high load, I/O or memory consumption in RHEL?

Solution Verified - Updated -

Issue

  • Sometimes server does not respond to commands.
    • Notice high CPU or i/o consume
    • Notice low memory free or high swap usage
    • Kernel Panic (by oom-killer)
  • What data should be collected if system is hung
    or observing performance issue?

Environment

  • Red Hat Enterprise Linux(RHEL) 4/5/6

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