How to properly size and position the crashkernel in RHEL 5?

Solution Unverified - Updated -

Issue

  • Please provide instructions for properly calculating crashkernel= setting for a system with a large amount of RAM.
  • service kdump start fails with crashkernel reservation failed
  • Booting Red Hat Enterprise Linux 5 with the crashkernel=X@Y parameter enabled for the kdump kernel does not always succeed.

Environment

  • Red Hat Enterprise Linux 5
  • kdump from kexec-tools to capture vmcore
  • System with large amount of memory

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