ORA-15027: active use of diskgroup string precludes its dismount

ORA-15027: active use of diskgroup "string" precludes its dismount


Cause:


An ALTER DISKGROUP ... DISMOUNT command specified a diskgroup which had clients with open files in the diskgroup. Diskgroups cannot be dismounted until all open files in the diskgroup are closed.



Action:


Stop all clients that are using this diskgroup and retry the ALTER DISKGROUP ... DISMOUNT command. Query the V$ASM_CLIENT fixed view in an ASM instance or use ASMCMD LSOF to list active clients.