ORA-15027: active use of diskgroup "string"

admin

ORA-15027: active useof diskgroup "string" precludes its dismount
Cause: An ALTER DISKGROUP ... DISMOUNT command specified adiskgroup
which had clients with open files in the diskgroup. Diskgroups cannot be
dismounted until all open files in the diskgroup are closed.
ORA-12700to ORA-19400 13-133
Action: Stopall 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.