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dumpon (8)
  • >> dumpon (8) ( FreeBSD man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    dumpon
    
     - specify a device for crash dumps
    
     
    

    SYNOPSIS

    [-v ] special_file
    [-v ] off  

    DESCRIPTION

    The utility is used to specify a device where the kernel can save a crash dump in the case of a panic.

    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.  

    IMPLEMENTATION NOTES

    Since a panic(9) condition may occur in a situation where the kernel cannot trust its internal representation of the state of any given file system, one of the system swap devices, and not a device containing a file system, should be used as the dump device.

    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.  

    FILES

    /dev/{ad,da}?s?b
    standard swap areas
    /etc/rc.conf
    boot-time system configuration

     

    SEE ALSO

    fstab(5), rc.conf5, config(8), init(8), rc(8), savecore(8), swapon(8), panic(9)  

    HISTORY

    The utility appeared in Fx 2.1 .  

    BUGS

    Because the file system layer is already dead by the time a crash dump is taken, it is not possible to send crash dumps directly to a file.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    IMPLEMENTATION NOTES
    FILES
    SEE ALSO
    HISTORY
    BUGS


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