System information

210 System Analysis and Tuning Guide
18.6.1 Manual kdump Configuration
kdump reads its configuration from the /etc/sysconfig/kdump file. To make
sure that kdump works on your system, its default configuration is sufficient. To use
kdump with the default settings,follow these steps:
1 Append the following kernel command line option to your boot loader configura-
tion, and reboot the system:
crashkernel=size@offset
You can find the corresponding values for size and offset in the following ta-
ble:
Table18.1: Recommended Values for Additional Kernel Command Line
Parameters
Architecture Recommended value
i386 and x86-64 crashkernel=256M for 0 - 12
GB memory
crashkernel=512M for 13 - 48
GB memory
crashkernel=1G for 49 - 128
GB memory
crashkernel=2G for 129 - 256
GB memory
IA64 crashkernel=256M (small systems)
or crashkernel=512M (larger sys-
tems)
ppc64 crashkernel=128M@4M or
crashkernel=256M@4M (larger sys-
tems)
s390x crashkernel=128M (small systems)
or crashkernel=256M (larger sys-
tems)