topic Re: core file in Operating System - HP-UX

core file

mmdallal — Wed, 28 May 2008 05:04:33 GMT

Dear, my machine is HP-UX 11.11 and an HP OpenView NNM and OVO is installed in it
problem: I found that the root is full, when I searched the last modified file I found that there is a "core" file with huge size 723 Mb
what is this file?
how can I reduce the used space in root?
----------------------
bash-2.04# pwd
/
bash-2.04# ls -l core
-rw------- 1 root sys 759160832 May 28 01:48 core
bash-2.04# bdf
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 1048576 1048208 368 100% /
/dev/vg00/lvol1 298928 44544 224488 17% /stand
/dev/vg00/lvol8 7168000 3333392 3834608 47% /var
/dev/vg00/lvol7 2342912 1597720 739424 68% /usr
/dev/vg00/lvol4 2097152 1620872 474184 77% /tmp
/dev/datavg/oralv 71675904 30232760 40795604 43% /oracle
/dev/vg00/lvol6 7274496 5262384 1996416 72% /opt
/dev/vg00/lvol5 57344 2936 54040 5% /home
bash-2.04#
----------------------
best Regards

Re: core file

Ivan Krastev — Wed, 28 May 2008 05:10:48 GMT

If you don't have a plans to analyze core file - just remove it.

regards,
ivan

Re: core file

Venkatesh BL — Wed, 28 May 2008 05:12:36 GMT

Using 'file' command would tell you the process that generated it. Then you can decide whether to keep it or not.

# file core

Re: core file

Prashanth Waugh — Wed, 28 May 2008 05:41:35 GMT

hi ,

If its not importnat file. then you can null it by
giving the command
#>core

best Regards

Re: core file

mmdallal — Wed, 28 May 2008 05:57:48 GMT

kindly, how can determine the importance if this file?
any way what is this file, and whit is the purpose of this file?

Re: core file

Venkatesh BL — Wed, 28 May 2008 06:02:48 GMT

core file is generated when a process receives a certain signal from the kernel. Typically, it could be due to improper memory access.

The file contains the stack trace and other important register values from the killed process. This can be used to find the reason for the process failure.

One cannot generalize that core files are irrelevant!

Re: core file

Venkatesh BL — Wed, 28 May 2008 06:21:10 GMT

Also, note that you need a debugger to analyse it. If it is a one time occurance, you can just look at the 'file' output and delete the file. You could do further analysis if the problem recurs again.

Re: core file

mmdallal — Wed, 28 May 2008 09:01:41 GMT

in case I did delete it, dose this will make system crash, or and system malfunctioning?
Best regards

Re: core file

Robert-Jan Goossens_1 — Wed, 28 May 2008 09:13:06 GMT

Hi,

Before you delete the core file, check which application produced the core file.

# file core

If it has been produced by NNM or OVO you might have that analyzed by HP.

Regards,
Robert-Jan

Re: core file

mmdallal — Wed, 28 May 2008 09:25:56 GMT

any risk assistance?
-------------
bash-2.04# file core
core: core file from 'pmd' - received SIGBUS
-------------

Re: core file

Sajjad Sahir — Wed, 28 May 2008 09:28:33 GMT

Dear friend
if it is core file u can easily remove from
system.

find / -name core -exec rm -i {} \;

it will remove u core file

no problem to remove any core file

sajjad

Re: core file

Vivekanandan Somanathan — Wed, 28 May 2008 09:30:50 GMT

Hi

Nothing will happen... You can goahead and delete the file.

- Vivek

Re: core file

Venkatesh BL — Wed, 28 May 2008 10:15:40 GMT

So, 'pmd' application caused the core file to be generated. You can feel free to delete any core file from the system. It is not a 'system' file by any means. So, your system will not be affected in any way if you remove it.

The analysis of the core file is required only if you want to trouble shoot the problem with the application.

Re: core file

Sp4admin — Wed, 28 May 2008 15:43:29 GMT

Hello,

Just remove the core file. when a file system starts to fill up, one of the first things you do is start looking for core files.

sp,

Re: core file

Dennis Handly — Wed, 28 May 2008 15:57:22 GMT

>sajjad: find / -name core -exec rm -i {} \;

Caution with that. In /usr/conf there is a kernel module named "core".

Re: core file

mmdallal — Thu, 29 May 2008 04:32:42 GMT

Thanks for all
the problem is solved using your valuable comments, I used the ">core"
Best regards