oracle數據庫管理-IO異常導致bufer busy waits異常等待

1 故障現象  rman進行全備份報錯 channel ch00: starting piece 1 at 05-JAN-20 RMAN-03009: failure of backup command on ch01 channel at 01/05/2020 11:19:10 ORA-19501: read error on file "/orcl/oracle/oradata2/undotb
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