ORA-15027: open files in diskgroup "string" preclude its
dismount
Answer / guest
Cause: An ALTER DISKGROUP ... DISMOUNT command specified a
diskgroup which had database instance clients with open
files in the diskgroup. Diskgroups cannot be dismounted
until all open files in the diskgroup are closed by the
database instance clients.
Action: Stop all clients that are using this diskgroup and
retry the ALTER DISKGROUP ... DISMOUNT command.
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