Action: Before proceeding with the installation, you must deconfigure CSS, shut down any Oracle Automatic Storage Management (Oracle ASM) instances, and shut down all databases that use Oracle ASM for storage on all of the listed nodes. Oracle Clusterware installation starts a cluster-wide version of CSS. After Oracle Clusterware installation is complete, you may start up any databases and Oracle ASM instances that previously used CSS. When they are brought back up, Oracle Clusterware provides CSS.