Fujitsu PRIMEQUEST 500A Series Installation Manual page 301

Note:
(4) Enabling the SysRq key
To enable the [SysRq] key, do as follows:
When the system parameter check tool is installed
Enter the following command:
# /usr/sbin/fjprmset -f -S -a kernel.sysrq=1
Enter the following command. If 1 is displayed, it indicates that the setting has been
validated.
# cat /proc/sys/kernel/sysrq
For the system parameter check tool, see
Tool."
When the system parameter check tool is not installed
Correct the kernel/sysrq value in the /etc/sysctl.conf file to validate the setting.
# vi /etc/sysctl.conf
Line changed and added:
kernel.sysrq = 1
# sysctl –p
Enter the following command. If "1" is displayed, assumed that the setting is
reflected.
# cat /proc/sys/kernel/sysrq
(5) Setting a dump service
Perform the following operation to set a dump service so that it starts with a boot.
# chkconfig diskdump on
C122-E001-10EN
The dump device area cannot be shared with a file system or other such unit.
Take care with regard to the information contained in the dump device area
because files in this area are damaged by initialformat, which formats dump
information.
4.9 Dump Environment Setup (Linux: Red Hat)
Appendix A.5, "System Parameter Check
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