"Operation not permitted" on trying to change the db_recovery_file_dest parameter

• Application: Exadata Database 19.19
• OS: Oracle Linux Server 7.9

Hi,

Trying to change the db_recovery_file_dest parameter (from a local path to a remote one), I get the following error message:

SQL> alter system set db_recovery_file_dest='/backup/exadata/rman' scope=both sid='*';
alter system set db_recovery_file_dest='/backup/exadata/rman' scope=both sid='*'
*
ERRO na linha 1:
ORA-02097: o par▒metro n▒o pode ser modificado, pois o valor especificado ▒ inv▒lido
ORA-00600: c▒digo de erro interno, argumentos: [ksfd_odmchkpathattr], [Operation not permitted],
[], [], [], [], [], [], [], [], [], []
ORA-17503: ksfdopn:13 Falhou ao abrir o arquivo /backup/exadata/rman
ORA-17500: Erro ODM:Operation not permitted