Multiple servers reboot simultaneously

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux - All Releases - All architectures.

Issue

  • Multiple servers reboot at the same time.
  • No panic messages appear on screen
  • Kdump does not capture vmcore.

Resolution

  • Moving systems to UPS backup has prevented reboots.

Root Cause

  • Poor or unreliable power source.

Diagnostic Steps

  • Kdump is configured, tested to work, but doesn't.
  • Servers have a single source of power (the power grid or a single UPS).
  • If the system has a baseband management module such as ILO or DRAC, messages similar to the below may be shown:
Caution iLO 2 04/04/2012 10:43 04/04/2012 10:43 1 Server reset.

0021 Caution 14:45 04/04/2012 14:45 04/04/2012 0001
LOG: POST Error: A Critical Error occurred prior to this power-up

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