"active use of diskgroup \"%s\" 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
*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