What is the maximum value for crashkernel memory reservation ?

Solution In Progress - Updated 2022-06-16T12:32:13+00:00 -

Issue

What is the maximum for crashkernel variables ?
Why get below error when we set the big value for crashkernel on some server ?

            crashkernel reservation failed - No suitable area found.

            crashkernel reservation failed. specified size is too big.

Kdump is unstable if we set crashkernel as a big value start on RHEL7.5+ and RHEL8 system.
How do I detect the maximum value of the crashkernel in my system ?

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