今天驻地运维的兄弟在QQ上找我，说报告系统的RAC使用不了，Oracle RAC服务无法启动，
现像：
CRS-0184: Cannot communicate with the CRS daemon.
CRS-0184: Cannot communicate with the CRS daemon.
分析 数据库日志：
日志大量报I/O错误，根据经验这是存储层面出现问题，让驻地运维的兄弟去机房看看存储磁盘是不是挂了，10分钟后告诉我，存储电源线松了，我晕
解决：
我让运维的兄弟先把服务器关掉，存储也关掉，先开存储-->（5分钟左右）开启一台DB服务器-(观察RAC服务器起来后)--->再开启另外一台DB服务
数据库RAC服务正常应用 。
2014-10-23 08:00:04.026000 +08:00
Thread 1 advanced to log sequence 273 (LGWR switch)
Current log# 1 seq# 273 mem# 0: +DATA/reportdb/onlinelog/group_1.297.861203105
2014-10-23 11:30:15.832000 +08:00
WARNING: IO Failed. subsys:/opt/oracle/extapi/64/asm/orcl/1/libasm.so dg:1, diskname:ORCL:DATA disk:0x0.0xe968bd99 au:835804
iop:0x2b81f05f1000 bufp:0x2b81ef908a00 offset(bytes):876404064256 iosz:16384 operation:1(Read) synchronous:1
result: 4 osderr:0x3 osderr1:0x2e pid:757
WARNING: failed to read mirror side 1 of virtual extent 4 logical extent 0 of file 300 in group 1 from disk DATA allocation unit 835804 reason error; if possible,will try another mirror side
WARNING: IO Failed. subsys:/opt/oracle/extapi/64/asm/orcl/1/libasm.so dg:1, diskname:ORCL:DATA disk:0x0.0xe968bd99 au:835800
iop:0x2b93fecec000 bufp:0x2b93ff189e00 offset(bytes):876399837184 iosz:16384 operation:1(Read) synchronous:1
result: 4 osderr:0x3 osderr1:0x2e pid:15697
WARNING: failed to read mirror side 1 of virtual extent 0 logical extent 0 of file 300 in group 1 from disk DATA a