I'm not sure if this is exactly what you're looking for but check out the work
around in this bug:
http://bugs.opensolaris.org/view_bug.do;jsessionid=9011b9dacffa0b615db182bbcd7b?bug_id=6559281
Basically Look through "cfgadm -al" and run the following command on the
"unusable" attachmen
If you're having issues with a disk contoller or disk IO driver its highly
likely that a savecore to disk after the panic will fail. I'm not sure how to
work around this, maybe a dedicated dump device not on a controller that uses a
different driver then the one that you're having issues with?
