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dump_concurrent_on(5)					 dump_concurrent_on(5)

NAME
       dump_concurrent_on  -  enable/disable  option for system to dump memory
       using multiple dump units when a kernel panic occurs

VALUES
   Failsafe
   Default
	  Allowed values

   Recommended value
       DESCRIPTION
	      On large systems, the time required to dump system memory when a
	      kernel  panic  occurs  can  be  excessive	 or  even prohibitive,
	      depending on how much physical memory is installed in  the  sys‐
	      tem.   Concurrent	 dump  capability  results  in faster dumps by
	      dividing the task to different dump units which can  execute  in
	      parallel.

       The default value for The system determines whether or not to dump with
       multiple units based on the resources (CPUs and disks) available on the
       system and the properties of the drivers.

       The  (see  crashconf(1M)) command and its associated configuration file
       control the dump concurrency mode in the memory dumps associated with a
       system  crash.	On  rare occasions, the system may crash before is run
       during the boot process.	 On those  occasions,  the  configuration  set
       using the tunable will be used.

   Who Is Expected to Change This Tunable?
       Only HP Field Engineers should change the value of this tunable.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Tunable Be Turned On?
       This  tunable  should be turned on to allow dumps to dump with multiple
       dump units when there  is  a  system  crash  if	there  are  sufficient
       resources.

   What Are the Side Effects of Turning the Tunable Off?
       Dumps may take more time.

   When Should the Tunable Be Turned Off?
       The  tunable  should be turned off if there is a problem using multiple
       dump units.

   What Are the Side Effects of Turning the Tunable On?
       The system decides whether or not to use multiple dump units  based  on
       the resources available.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter may be removed or have its meaning changed in  future  releases  of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may
       cause changes to tunable parameter values.   After  installation,  some
       tunable	parameters may no longer be at the default or recommended val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by HP.

SEE ALSO
       crashconf(1M), alwaysdump(5), dontdump(5), dump_compress_on(5).

	      Tunable Kernel Parameters - Integrity Systedump_concurrent_on(5)

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