> > Why exactly is the dump lost?  Does your system have
> > a dump zvol defined that is used to store system
> > crash dumps? 
> 
> sure, of course, default config.

IIRC, under certain conditions the opensolaris
installer does not create dump and / or swap
zvols.

> > Isn't the kernel crash dump still available on that
> > dump zvol?   
> 
> somehow yes, usable, no
> 
> batsc...@osol:~# savecore
> savecore: bad magic number 5b5e20c4

Hmm, what kind of disk device is used for the
opensolaris root pool?

An USB storage device, perhaps?  In that case it could be

    Bug ID       6889772
    Synopsis    kernel dumps don't work to USB disk or USB flash drives
    http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6889772
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