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Solaris core dump question

Posted on 2013-11-11
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Last Modified: 2013-11-26
When the server is in ok prompt we can panic the server using sync command. What is the point of getting that core dump? Oracle is asking to give core dump.
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Question by:mokkan
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omarfarid earned 2000 total points
ID: 39639279
crash dumps are memory dump of the machine at crash time. It contains info that support will use to identify why the crash happened. please see links below for how to manage crash dumps


http://docs.oracle.com/cd/E23824_01/html/821-1451/tscrashdumps-4.html#scrolltoc
http://docs.oracle.com/cd/E23824_01/html/821-1451/tscrashdumps-31.html
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by:mokkan
ID: 39639517
When sever is down. How is it going to have information in memory?
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by:omarfarid
omarfarid earned 2000 total points
ID: 39639574
when system crashes or panic, it dumps the memory content to hard disk. Here some quoted description:

" When a panic occurs on a Solaris system, a message describing the error is usually echoed to the system console. The system will then attempt to write out the contents of the physical memory to a predetermined dump device, which is usually a dedicated disk partition, or the system swap partition. Once this is completed, the system is then rebooted.

Once the system begins rebooting, a startup script will call the savecore utility, if enabled. This command will perform a few tasks on the memory dump. First it will check to make sure that the crash dump corresponds to the running operating system. If the dump passes this test, savecore will then begin to copy the crash dump from the dedicated dump device to the directory /var/crash/`uname -n', or some other predetermined device. The dump is written out to two files, unix.n and vmcore.n, where n is an sequential integer identifying this particular crash. Finally, savecore logs a reboot using the LOG_AUTH syslog facility. "
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by:mokkan
ID: 39677885
Thank you very much guys.
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