dumpon - specify a device for crash dumps
Calls to normally occur from the system multi-user initialization file /etc/rc controlled by the ``dumpdev'' variable in the boot time configuration file /etc/rc.conf
For most systems the size of the specified dump device must be at least the size of physical memory. Even though an additional 64 kB header is added to the dump, the BIOS for a platform typically holds back some memory, so it is not usually necessary to size the dump device larger than the actual amount of RAM available in the machine.
The utility will refuse to enable a dump device which is smaller than the total amount of physical memory as reported by the hw.physmem sysctl(8) variable.
The -v flag causes to be verbose about its activity.
The utility operates by opening special_file and making a DIOCSKERNELDUMP ioctl(2) request on it to save kernel crash dumps. If special_file is the text string: ``off '' performs a DIOCSKERNELDUMP ioctl(2) on /dev/null and thus instructs the kernel not to save crash dumps.
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Created 1996-2021 by Maxim Chirkov
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