False Clusterware Reboots
Is there such a thing called false reboots? You are running a cluster and your cluster nodes are getting rebooted randomly. Although many reasons can be causing the reboots, Oracle Clusterware process...
View ArticleVoting Disk Hung and Cluster Availability
Introduction There are few parameters you should tune in your 11g Cluster before going to production. They are: diagwait, misscount, disktimeout and reboottime. Oracle Unbreakable Cloud already has a...
View ArticleChecking Clusterware
To check the status of the cluster, you can run the following command. Login as root user or the grid user who owns the grid infrastructure(if it is 11g R2 cluster) and then run the following command...
View ArticleIdentifying Oracle Cluster Name
There are many ways to identify the oracle cluster name or crs name. The following are the few ways to identify: 1. If you have the installation logs, you can go under there and get the information...
View ArticleOracle Clusterware Architecture
Introduction Oracle clusterware has two types of configuration files in shared storage which should be accessible to all of the nodes in the cluster. They are called as OCR(Oracle Cluster Registry) and...
View Articlediagcollection.pl errors “Mandatory argument ‘crshome’ is missing”
The diagcollection.pl script fails with this error even though the environment variable ORA_CRS_HOME is set on certain releases 10.2.0.4 to 11.1.0.6 [root@mysrvr bin]# ./diagcollection.pl -collect...
View ArticleBEST PRACTICES OF ORACLE 10G/11G CLUSTERWARE
best_practices_oracle_clusterware_session355_wp(Read more...)Categories: High AvailabilityTags: CRShigh availabilityOracle
View ArticleFalse Clusterware Reboots
Introduction Is there such a thing called false reboots? You are running a cluster and your cluster nodes are getting rebooted randomly. Although many reasons can be causing the reboots, Oracle...
View ArticleSingle Client Access Name – SCAN
Introduction SCAN are registered in DNS with three VIPs in round robin fashion. DNS will redirect the traffic on one of the database nodes. Clusterware will assign the SCAN VIP to one of the nodes...
View ArticleOracle Grid Infrastructure: crsctl stat res –t may return incorrect state
In 11.2 cluster, the crsctl command may return incorrect state details. For an example, in the following output the ASM status on node ubcsys1 and ubcsys2 are empty although the ASM is up on both of...
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