dump_concurrent_on(5)dump_concurrent_on(5)NAMEdump_concurrent_on - enable/disable option for system to dump memory
using multiple dump units when a kernel panic occurs
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
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
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
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?
All HP-UX kernel tunable parameters are release specific. This parame‐
ter may be removed or have its meaning changed in future releases of
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
was developed by HP.
SEE ALSOcrashconf(1M), alwaysdump(5), dontdump(5), dump_compress_on(5).
Tunable Kernel Parameters - Integrity Systedump_concurrent_on(5)