IPMI, iLO, or iDRAC interfaces provide a direct line to the machine, allowing you to view the console log and perform hard resets without relying on the primary operating system. These tests can identify a failing drive or a corrupted memory module that the operating system might not report clearly.
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Look for entries marked as "error," "fail," or "panic," as these indicate the exact moment the system deviated from normal operation. Hardware issues often manifest as total unresponsiveness or physical indicators such as flashing lights or unusual sounds.
Check disk integrity using `df` and `iostat` to identify I/O bottlenecks. Software errors, conversely, might allow the machine to be pinged but result in failed applications or inaccessible ports.
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Resource exhaustion, particularly memory or CPU saturation, usually presents as extreme slowness rather than a complete blackout, making it distinct from the other categories. This log acts as a diagnostic map, ensuring that subsequent steps are based on data rather than instinct.
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