General

Crash Kernel recommendations

The following are the recommended crashkernel values for different memory ranges. This values are arrived at after testing different scenarios:

• For memory between 2G through 4G, reserve 320M For memory between 4G through 32G, reserve 512M For memory between 32G through 64G, reserve 1024M For memory between 64G through 128G, reserve 2048M For memory above 128G, reserve 1024M

Actaully, we can pass it as a condition based crashkernel= parameter based on the size of total system memory, so that it works irrespective of system memory size, like below:

        crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M

So, the above parameter effective converts to crashkernel=320M on a system with 2G through 4G memory, while it means crashkernel=512M on a system with 4G through 32G memory and so on. Also, if Out of Memory issues are seen in kdump kernel, try increasing the memory reserved for crashkernel.