ORA-00205: error in identifying control file, check alert log for more info

1.现象：升级完JavaVM补丁之后，db启动报错

SQL> startup
ORACLE instance started.

Total System Global Area 1.3362E+10 bytes
Fixed Size                  2240984 bytes
Variable Size            7247760936 bytes
Database Buffers         6106906624 bytes
Redo Buffers                4935680 bytes
ORA-00205: error in identifying control file, check alert log for more info

2.db alert日志如下：

ORA-00210: cannot open the specified control file
ORA-00202: control file: '+DATADG/sg3pd/controlfile/current.260.790090209'
ORA-17503: ksfdopn:2 Failed to open file +DATADG/sg3pd/controlfile/current.260.790090209
ORA-15001: diskgroup "DATADG" does not exist or is not mounted
ORA-15055: unable to connect to ASM instance
ORA-01034: ORACLE not available
ORA-27123: unable to attach to shared memory segment
Linux-x86_64 Error: 13: Permission denied
ORA-205 signalled during: ALTER DATABASE  

3.asm实例正常启动

$ps -ef| grep smon
root      26666     1     0 16:25 ?         00:00:34 /apps/opt/grid/product/11.2.0/bin/osysmond.bin
grid      27105     1     0 16:26 ?         00:00:00 asm_smon_+ASM2
oracle   27223 32077  0 19:26 pts/0   00:00:00 grep smon

4.查看oracle可执行文件

[oracle@rac1 ~]$ ls -l $ORACLE_HOME/bin/oracle
-rwsr-s--x 1 oracle oinstall 242826331 Sep 27 16:23 /u01/app/oracle/product/11.2.0/db_1/bin/oracle

5.解决办法

（1）关闭集群

crsctl stop crs

（2）文件重新赋权

#chmod 6751 /apps/opt/grid/product/11.2.0/bin/oracle

（3）重启集群

crsctl start crs