How should the crashkernel parameter be configured for using kdump on Red Hat Enterprise Linux 5?

Solution Verified - Updated -

Issue

  • How should the crashkernel parameter be configured for using kdump on Red Hat Enterprise Linux 5?
  • What is the recommended RAM size to reserve for kdump kernel for different different sizes of RAM?
  • I am using the crashkernel kernel parameter, but after boot the system writes kernel: crashkernel reservation failed - memory is in use. How to correctly configure the parameter?
  • Kernel panic with crashkernel warning Memory for crash kernel (0x0 to 0x0) not within permissible range

Environment

  • Red Hat Enterprise Linux 5
  • kdump/kexec being used to capture vmcore

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