topic system panic in Operating System - HP-UX

system panic

navin — Thu, 06 Aug 2009 04:43:52 GMT

Hello All,

Especially Bill hassel.....

Can some one tell me if the toc has been missed to create a crash dump in the event of system panic - after the reboot - does the savecrash will create the crash dump is that equal to the other one.

what are the pros and cons of issuing toc when system panic..not really crashed..

Thanks in advance

Re: system panic

SoorajCleris — Thu, 06 Aug 2009 05:19:28 GMT

Hi,

The full memory dump is copied to the dump device if the dump device is configured and accessible, next boot it will be transferred to the save crash directory that is what savecrash does, it will not have any ability to generate anything and there is nothing called equvilant.

If it is an HPMC there will be a ts99 dump.

Now you may decide what will happen.

"what are the pros and cons of issuing toc when system panic..not really crashed.."

not really crashed - you are telling it is paniced and hung state, and it is not rebooted.

Other than a toc/reset what else you can do this case? So it doesnt matter what ever the pros and cons !!!!

regards,
Sooraj

Re: system panic

Ganesan R — Thu, 06 Aug 2009 06:13:35 GMT

Hi Navin,

>>does the savecrash will create the crash dump is that equal to the other one<<

No, If you haven't given TOC from GSP/MP or system not initiated TOC then you won't be able to get crash dump using savecrash.

Savecrash is to save the system dump from the dump device to filesystem. If dump is not there on dump device, how it will save it to filesystem?

Re: system panic

navin — Thu, 06 Aug 2009 14:57:57 GMT

thanks all for the reply - but i have config savecrash device in rc.config.d as savecrash=1 and the crash dir ...
but still if we dont issue the toc ..it wont create crash?
thanks

Re: system panic

SoorajCleris — Thu, 06 Aug 2009 15:14:28 GMT

Hi,

When you are not doing TOC?
Which state of the server?

If you do a cold reset it will not create crashdump, if you want crash dump you should do a toc.

Regards,
Sooraj

Re: system panic

R.K. # — Thu, 06 Aug 2009 15:37:13 GMT

If the size of dump or the size of place where crash gets saved (normally /var) is smaller than the size of crash files, it will not create FULL dump.

What about #savecrash -v

Re: system panic

Bill Hassell — Thu, 06 Aug 2009 17:39:18 GMT

TOC creates a crash condition. You have to manually push the TOC button or type TC but the results are the same as a kernel panic -- the kernel will transfer to the dump code and start writing memory to the dump areas. Whether you push the TOC button or the system crashes, you still get a dump.