So….the server crashed and after reboot I got something like this:
Wed DEC 04 22:51:55 EST 2013 ORA-00210: cannot OPEN the specified control file ORA-00202: control file: '/path/control01.ctl' ORA-27086: unable TO LOCK file - already IN USE Linux-x86_64 Error: 11: Resource temporarily unavailable Additional information: 8 Wed DEC 04 22:51:55 EST 2013 ORA-205 signalled during: ALTER DATABASE MOUNT...
This is a classic symptom of a Netapp problem, which likes to hold file locks open on NFS mounts.
There is a standard procedure for clearing those locks; see, for instance, document 429912.1 on Metalink.
As root on the NetApp, from the prompt:
priv set advanced sm_mon -l # to check where are the locks do this: lock status -h <DB_SERVER> # to break the locks do this: lock break -h <DB_SERVER>