VMCORE NOT FOUND

[Ashwin Chandra]

ryan,
i think i was a bit vague in my email. I am correctly usnig the swap device 
and dump directory. Before the system reboots the core should be saved from 
the swap device (before it mounts) and into the path that i specified. 
dumpdev="/dev/ad0s1b", our 2gb swap device and dumpdir="/usr/crash"
So I am doing all this correctly, yet still no dump comes up and I am not 
sure why! =(

Ash

----- Original Message ----- 
From: "Ryan Sommers" <ryans at gamersimpact.com>
To: "Ashwin Chandra" <ashcs at ucla.edu>
Cc: <freebsd-hackers at freebsd.org>
Sent: Saturday, February 12, 2005 12:55 PM
Subject: Re: VMCORE NOT FOUND


> Ashwin Chandra said:
>> I actually changed dumpdir to /usr/crash since /var did not have enough
>> space to accomodate 512 MB.  But /usr has 60gigs. When the kernel panics
>> it
>> just crashes, I never get a message saying "dumping...". Savecore upon
>
> You dump to a device, not a path. Because the kernel is crashing
> file-system consistency can't be assumed. Therefore you can't dump to a
> file-system. Instead you dump to a device, typically the swap device. Then
> after you reboot and ensure ensure file-system integrity you can save the
> dump onto the file-system for analysis.
>
> I believe you are getting a little mixed up in all the terms:
>
> dump device: the device the kernel will save a dump to. (This is a device,
> not a file-system path)
>
> dump dir: the file-system path a core from the dump device will be saved
> to by savecore.
>
> The kernel does not dump to the dump dir. The kernel dumps to the dump
> device, the savecore utility retrieves a previous dump from the dump
> device and saves it in the dump dir.
>
> Like most things, this is outlined very well in the handbook:
>
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html#KERNELDEBUG-OBTAIN
>
> -- 
> Ryan Sommers
> ryans at gamersimpact.com
>
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