dump_concurrent_on(5)						File Formats Manual					     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 system.  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 parameter 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 values.  For information about the effects of installation on tun-
       able values, 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 Systems Only			     dump_concurrent_on(5)