早上檢查一ORACLE數據庫的RMAN備份的郵件時，發現出現了ORA-27072: File I/O error等錯誤，具體信息如下所示：
channel ORA_DISK_1: starting piece 1 at 23-MAR-15
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup plus archivelog command at 03/23/2015 03:48:02
ORA-19502: write error on file "/u04/backup/backupsets/ora_df875072537_s15615_s1", blockno 182657 (blocksize=8192)
ORA-27072: File I/O error
Linux-x86_64 Error: 9: Bad file descriptor
Additional information: 4
Additional information: 182657
Additional information: 700416
Recovery Manager complete.
關於ORA-03002與ORA-27072錯誤的描述，如下所示
[oracle@DB-Server-03 ~]$ oerr ora 19502
19502, 00000, "write error on file \"%s\", blockno %s (blocksize=%s)"
// *Cause: write error on output file
// *Action: check the file
[oracle@DB-Server-03 ~]$ oerr ora 27072
27072, 00000, "File I/O error"
// *Cause: read/write/readv/writev system call returned error, additional
// information indicates starting block number of I/O
// *Action: check errno
RMAN備份出現這個錯誤是在生成備份集時，文件I/O發生錯誤，因為/u04分區空間不足導致RMAN備份無法寫入數據，我們也收到了磁盤分區告警的郵件。如下所示。
