received this error this morning while creating a diskgroup in ASM
create diskgroup ARCHDG1 external redundancy disk
‘/dev/rdsk/c6t60060E80058DA50000008DA50000000Cd0s0′,’/dev/rdsk/c6t60060E80058DA50000008DA50000000Dd0s0’
ORA-15260: permission denied on ASM disk group’
What happened I logged on with sysdba apparently from 11gR2 you need to logon with sysasm
so
sqlplus ‘/ as sysasm’ does the trick