ORA-15025: could not open disk "/dev/asm***"--转载

Symptoms: 打完补丁后，数据库报错ORA-15025，数据库无法启动. alert日志信息： Wed Jul22 16:26:57 2015 ORA-15025:could not open disk "/dev/12casm-diskb" ORA-27041:unable to open