Why Is OS Memory Reserved?

In the context of kdump, a crash kernel is used to take over the system when the main kernel crashes. To ensure that the crash kernel can start normally, reserve a physical memory for it during system startup. crashkernel determines how much memory needs to be reserved for the crash kernel.

If crashkernel is set to auto, the system automatically determines how much memory is to be reserved for the crash kernel based on the physical memory size of the server. For crashkernl=auto, memory is reserved depending on the CPU architecture. In x86 or Arm, the reserved size is based on the memory specifications.

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