no dump file no crash log files either on ES40

[bouazzaoui]

hi,
I had a system crash on ES40 server but when I tried to show log files, nothing was created
Can you please tell me whish parameters should I check in order that server will be able to create automatically required file for diag?
thanks in advance

regards

[Ralf Puchner]

a crashdump is created within /var/adm/crash.
You can check by simple type in:

kdbx -k /vmunix /dev/mem
(dbx) set hz = 0

system will crash. Use

>>> crash
>>> boot

possible reasons if no crash dumps will be written:

1. Swap device space:
The dump is saved on your combined primary and secondary swaps before being sent to /usr/adm/crash.

2. Hardware problems can also prevent a successful crash. The controller provides the data path between the system memory and the drive; unavailable paths can cause unsuccessful dumps. The system errorlog or /usr/adm/messages should show any associated errors.

3. Never overlook the configuration.

o Proper firmware for this software revision?
o Proper configuration file entries.
o Is the fstab file ok? Especially check the entry for primary swap.
o Unsupported, third-party drives have also been known to cause problems.

4. Kernel parameter "dont_dump" is set.

5. The dump device must be on a LUN 0 device.

6. LSM swap issues.

[Dave Bechtold]

Hello,

I suggest you try running /sbin/dumpsys, Tru64 UNIX V5, to see if the system can take a dump and write it to the /var/adm/crash/ directory. You can do this to a live system it will not cause it to panic or anything. See "man dumpsys" for details.

Also, make sure /sbin/savecore is executing at boot time. It runs based on a link in /sbin/rc2.d named S00savecore.

# ls -l /sbin/rc2.d/S00savecore
lrwxr-xr-x 1 root bin 18 Aug 21 2002 /sbin/rc2.d/S00savecore ->
../init.d/savecore

The savecore man page has good information on the process of saving a core dump on the system and possible problems. Another good resource is the man page for vmzcore and sys_attrs_generic. The sys_attrs_generic reference page documents the dump related sysconfig attributes.

If this doesn't help, please post the Tru64 UNIX version your working with.

Hope that helps,
Dave Bechtold