dump_compress_on man page on HP-UX

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dump_compress_on(5)					   dump_compress_on(5)

       dump_compress_on	 -  selects whether the system dumps memory pages com‐
       pressed or uncompressed when a kernel panic occurs

       (Allow the kernel to decide whether to dump compressed or not based  on
       the system state at the time of the crash.)

   Allowed value
       Integer values and

       The setting for is used as follows:

	      Dump uncompressed.

	      Dump with compression for speed if possible.

   Recommended values
       (Allow the kernel to choose dump mode.)

       The value the kernel usually chooses is 1.

       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.	 Compressed dump capa‐
       bility results in smaller and faster dumps that will also  take	lesser
       time to save over into the filesystem.

       The  (see  crashconf(1M)) command and its associated configuration file
       control the dump compression 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.

       The  default  value for this parameter is The system determines whether
       or not to dump compressed based on the type of crash  that  occurs,  in
       this case.

       Note  that  certain types of system crash require an uncompressed crash
       dump.  Also, the system operator may request an uncompressed crash dump
       at  the	time  the  dump is taken.  In either of these cases, an uncom‐
       pressed dump will be performed regardless of the mode selected in

   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 dump compressed  when  there	 is  a
       system crash.

   What Are the Side Effects of Turning the Tunable Off?
       In  this	 case,	an uncompressed dump is taken always.  On large memory
       machines, an uncompressed dump take typically three times longer than a
       compressed dump.

   When Should the Tunable Be Turned Off?
       The  tunable should be turned off if there is a problem with compressed

   What Are the Side Effects of Turning the Tunable On?
       The system decides the dump mode based on the type of crash.

   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 Hewlett-Packard Company.

       crashconf(1M), alwaysdump(5), dontdump(5).

			   Tunable Kernel Parameters	   dump_compress_on(5)

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