How should the crashkernel parameter be configured for using kdump on RHEL6?

Updated 2014-09-04T06:51:09+00:00

Issue

  • What is the correct crashkernel parameter for kdump to work?
  • "crashkernel reservation failed - memory is in use" errors when kernel panics
  • When configuring the crashkernel parameter the kdump service either fails to start or starts with this warning:
Your running kernel is using more than 70% of the amount of space you reserved for 
kdump, you should consider increasing your crashkernel reservation

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • x86 and x86_64 architecture

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