What To Do With Core Files; Problems With Automatic Memory Dump; Avoiding Problems With Automatic Memory Dump - HP 3000 Series Handbook
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Also See for 3000 Series:
- Installation and service manual (80 pages) ,
- Installation manual (42 pages) ,
- Manual (20 pages)
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1.
After the panic occurs, the HP- UX kernel writes an image of its physical memory onto the
dump device. This is the core file (crash file). By default, the dump device is the primary
swap device.
2. Usually when the core dump is complete, the system will attempt to reboot the system.
During reboot, HP- UX will attempt to save the previously created core file (on the dump
device) into the itmpi syscore directory on disk.
Specifically, the jetcjrc bootup script runs savecore (1M), the command for saving the core
file and the /hp-ux file to disk. By default, the jetcjrc script specifies the target directory
as /tmp/syscore.
The two files copied by savecore are named:
• hp-ux. n (a copy of the original kernel, /hp-ux)
• hp-core. n (a copy of the physical memory image).
Together these two files make up a core dump pair. Then in the file names is a number
assigned to a particular core dump pair.
What To Do With Core Files
The core files created by savecore are very big (the same size as the system physical memory).
If you know why the system panic occurred, you can delete the core files.
If you feel you need to save these files for future analysis, it is best to save them to tape and
remove them from your file system in order to free up space.
Troubleshooting difficult problems (especially intermittent problems) often requires two or
more core files.
Problems With Automatic Memory Dump
The following conditions may prevent the automatic memory dump from succeeding:
• The savecore command line has been commented out or removed from the jetcjrc script.
• The directory in which savecore has been told to put the crash file does not exist. By
default this directory is /tmp/syscore.
Note
This directory is not automatically created during install.
•
• There is not enough room in the dump device(s) or in the partition that savecore is told to
use. If the dump device is too small to contain the image of physical memory, the dump will
be only partially saved and will be invalid.
Avoiding Problems with Automatic Memory Dump
The best way to avoid memory dump problems is to make sure your system is properly set up.
For example, make sure that the target directory for savecore has already been created on
your computer.
There are several ways to deal with the problem of the dump device or partition being too
small to contain the core files:
Troubleshooting
5-27
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Troubleshooting
