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Full Discussion: If test array element multiplication
Top Forums Shell Programming and Scripting If test array element multiplication Post 303020346 by rbatte1 on Tuesday 17th of July 2018 05:50:32 AM
Old 07-17-2018
Do you also check for the boot device being on both/all disks in rootvg and the dump device? I had a suggestion that the dump device should not be mirrored, so we created two separate devices, on for each PV. Fortunately, we never needed them, but you never know......

You should probably also check that the LV copies are synchronised. I've no longer got an AIX server so I can't test things, but something simple like lsvg -l | grep -i stale might suffice.



I hope that this helps,
Robin
 

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LEARN ABOUT FREEBSD

dumpon

DUMPON(8)						    BSD System Manager's Manual 						 DUMPON(8)

NAME

     dumpon -- specify a device for crash dumps

SYNOPSIS

     dumpon [-v] special_file
     dumpon [-v] off
     dumpon [-v] -l

DESCRIPTION

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

     Calls to dumpon 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.

     The default type of kernel crash dump is the mini crash dump.  Mini crash dumps hold only memory pages in use by the kernel.  Alternatively,
     full memory dumps can be enabled by setting the debug.minidump sysctl(8) variable to 0.

     For systems using full memory dumps, 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.  Also, when using full memory dumps, the dumpon 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) vari-
     able.

     The -l flag causes dumpon to print the current dump device or _PATH_DEVNULL ("/dev/null") if no device is configured.

     The -v flag causes dumpon 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 dumpon 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'', dumpon performs a DIOCSKERNELDUMP ioctl(2) on /dev/null and thus instructs the kernel not to save
     crash dumps.

     Since dumpon cannot be used during kernel initialization, the dumpdev variable of loader(8) must be used to enable dumps for system panics
     which occur during kernel initialization.

FILES

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

SEE ALSO

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

HISTORY

     The dumpon utility appeared in FreeBSD 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.

BSD
								  October 8, 2014							       BSD
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