how to specify undo tablespace for a PDB (instance) in RAC?

Hi all,

Our CDB using local undo tablespace for each PDB.

I've create a new undo tablespace (in PDB1 session) and add it to an PDB instance, but when shutdown/startup PDB, all two instances using them same undo tablespace and the later start one will fail to start with message: "ORA-30013: undo tablespace 'UNDOTBS2' is currently in use"

on node 2, which currently open:

SQL> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED

---------- ------------------------------ ---------- ----------

         4 PDB1                            READ WRITE NO

SQL> show parameter undo_tablespace

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

undo_tablespace                      string      UNDOTBS2

on node 1, which is close and need to open: