ORA-15032 And ORA-15027 Executing Dismount

Putting a diskgroup offline gives the following errors.

 SQL> alter diskgroup ocrmus_dg dismount
  2  ;
alter diskgroup ocrmus_dg dismount
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15027: active use of diskgroup "OCRMUS_DG" precludes its dismount


We look to see if there is something that are using this diskgroup and in this case there is nothing like showing the lsof command (from the prompt ASMCMD). Also you can see from the ASM instance perform query from v$asm_client view;

C:\app\11.2.0\grid\BIN>asmcmd -p
ASMCMD [+] > lsof
DB_Name Instance_Name Path
ASMCMD [+] >


The problem is the spfile of the ASM instance, the spfile reside in this diskgroup, also in this case is where the OCR (Oracle Cluster Repository) are;

 SQL> show parameter spfile

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
spfile                               string      +OCRMUS_DG/muswin/asmparam





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