Tuesday, January 25, 2011

ASM and Cluster Synchronization Services – CSS

Cluster Synchronization Services – CSS ==>


ASM was designed to work with single instance as well as with RAC 10g clusters.
ASM, even in singleinstance,requires that Cluster Synchronization Services (CSS) is installed and started before ASM becomes available.

In a single instance, CSS maintains synchronization between the ASM and database instances. CSS, which is a component of Oracle’s Cluster Ready Services (CRS), is automatically installed on every node that runs Oracle Database 10g ASM and starts up automatically on server boot-up.

In RAC 10g environments, the full Oracle Cluster-ware (CRS) is installed on every RAC node.

If CSS does not start automatically on reboot or if there is a hostname configuration change. The following command can be used to reconfigure CSS on that host. Note, this command needs to run from the ORACLE_HOME where CSS is running from.

1. $ORACLE_HOME/bin/localconfig delete

2. $ORACLE_HOME/bin/localconfig add

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