Hi Blake,

Blake Irvin wrote:
> I'm having a very similar issue.  Just updated to 10 u6 and upgrade my 
> zpools.  They are fine (all 3-way mirors), but I've lost the machine around 
> 12:30am two nights in a row.
>
>
> What I'd really like is a way to force a core dump when the machine hangs 
> like this.  scat is a very nifty tool for debugging such things - but I'm not 
> getting a core or panic or anything :(
>   
You can force a dump.  Here are the steps:

Before the system is hung:

# mdb -K -F   <-- this will load kmdb and drop into it

Don't worry if your system now seems hung.
Type, carefully, with no typos:

:c   <-- and carriage-return.  You should get your prompt back

Now, when the system is hung, type F1-a  (that's function key f1 and the 
"a" key together.
This should put you into kmdb.  Now, type, (again, no typos):

$<systemdump

This should give you a panic dump, followed by reboot,  (unless your 
system is hard-hung).

max


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