一。打開數據庫alert日志，發現有報錯
ERROR: failed to establish dependency between database RACDB and diskgroup resource ora.DATA.dg
二。上mos查看（是一個BUG,無害）
This error is harmless.
It is documented in the internal Bug 8304720 "ERROR: FAILED TO ESTABLISH DEPENDENCY BETWEEN DB & DISKGROUP"
三。解決
$ srvctl modify database -d <db_unique_name> -a "<diskgroup_list>"
我自己的庫只有DATA和OCR兩個磁盤組，所以執行一下命令：
srvctl modify database -d RACDB -a "DATA,OCR"