ORACLE CRS Resource의 상태가 UNKNOW이 되는 일반적인 이유.

crs resource의 상태를 crs_stat 명령으로 확인해 보면 가끔 resource의 상태가 UNKNOW인 경우가 가끔 발생한다.
CRS resource가 정상적으로 가동 되지 않은 경우도 있고 또 정상적으로 가동된 것 같은데 UNKNOW인 경우도 가끔 있다.  

oracle CRS resource가 UNKNOWN 상태로 변경되는 이유는 일반적으로 CRS resource start/stop/check 시의 action script 수행이 실패할 때 status가 변경되게 된다. 다음은 CRS resource의 state가 UNKNOWN으로 변경되는 일반적인 원인이다.
    

1.  The permission of the resource trace file is incorrect.

2.  The permission of the action script and other racg script is incorrect.

3.  The server load is very heavy and the action script times out.

4.  The look up to NIS hangs or takes very long time and causes the action script to time out.

CRS resource의 action script는 다음의 명령으로 확인할 수 있다. 
crs_stat -p <resource name such as ora.node1.vip> | grep ACTION_SCRIPT

CRS resource 이름은 다음의 명령으로 확인할 수 있다.
crs_stat | grep -i name

다음은 위에 기술한 CRS resource의 UNKNOWN state의 일반적인 원인에 대해 점검해 볼 항목이다.

1.  The permission of the resource trace file if it is incorrect. 

The resource trace file in in the HOME/log/<node name>/racg directory where HOME is the the HOME directory of action script for the resource.

2.  The permission of racg scripts in the HOME/bin directory if it they are incorrect. 

HOME is the the HOME directory of action script for the resource. Please issue "ls -l HOME/bin/racg*" to get the permission of the racg script. Please issue "ls -l HOME/bin/racg*" as user oracle or a user who normally starts up failing resources.

If any of the racg script is a soft link to another file, then check the permission of the file to which the racg script is soft linked.

3.  Check crsd.log and see if the resource action script timed out. 

If it did, then check if the server load was heavy (95% used or higher) for a minute or longer at the time of the failure. Setting up OSWatcher or IPD/OS can help troubleshooting this if the timeout occurs intermittently. Also, check if the NIC was having a problem at the time of the failure. 

참고 : Common Causes for CRS Resources in UNKNOWN State (Doc ID 860441.1)