ORA-15260: permission denied on ASM disk group

select * from v$asm_disk;

select * from v$asm_diskgroup;

alter diskgroup DATA01 resize disk ORA_MAIN size 360G;

ORA-15260: permission denied on ASM disk group

When I login 11gR2 ASM instance as sysdba to mount diskgroup, it showed permission denied on ASM disk group. After I login the ASM instance as sysasm, it is fixed.

SQL> alter diskgroup DATA1 mount;
alter diskgroup DATA1 mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15260: permission denied on ASM disk group

 

SQL> connect / as sysasm <– as sysasm
Connected.
SQL> alter diskgroup data1 mount;

Diskgroup altered.

 

alter diskgroup DATA01 resize disk ORA_MAIN size 360G;

 

[grid@MDS-ORA-RAC-03 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Tue Feb 26 15:40:38 2013

Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options

SQL> connect / as sysasm
Connected.
SQL> alter diskgroup DATA01 resize disk ORA_MAIN size 360G;

Diskgroup altered.