It's the default (null) string. The instance SP file is on the diskgroup that it can't mount.. :( I guess that there's a configuration file somewhere not on ASM that causes it to mount the correct disk groups, since the missing diskgroup is mentioned in the alert log errors, even though the disks can't be found? On 04/08/12 09:45, Guillermo Alan Bort wrote: > did you check your disk string? > hth > Alan.- > > > -- > //www.freelists.org/webpage/oracle-l > > > > -- //www.freelists.org/webpage/oracle-l