One of my zone is stuck in down state, not able to boot it or halt it .. not even detach .. is there any way to recover without rebooting the whole system ( global zone ) ?
Have you tried accessing the console of the zone using:
# zlogin -C
?
Can you please give us the output of :
# zlogin "zonename" halt
and what error messages do you get when you execute it ?
Have you checked the zones log files? Maybe there is something in its syslog or SMF logs that can point you in the right direction. Also root's mail sometimes has some useful information in there so I would check root's mail for the downed zone as well. If you are able to bring it down you could always try rebooting the box.