How does Oracle RAC startup sequence?

1) INIT : INIT is the very first file to be checked to be start at the time of the operating system boot,it is system and service manager for the Linux , Aix or any other Linux flavor. This service start and stop through script which is stored in the /etc/init. d directory .

What is startup sequence in RAC?

Brief explanation of the startup sequence. The init tab file is the one it triggers oracle high availability service daemon. When a node of an Oracle Clusterware cluster starts, OHASD is started by platform-specific means like init. d in Linux. OHASD is the root for bringing up Oracle Clusterware.

What is Clusterware in Oracle RAC?

A High Availability Cluster and the Foundation for Oracle RAC. Oracle Clusterware is a portable cluster software that allows clustering of independent servers so that they cooperate as a single system.

How do I start a RAC cluster?

Step 1: Prepare the New Cluster Nodes.
Step 2: Deploy the Oracle Grid Infrastructure Home on the Destination Nodes.
Step 3: Run the clone.pl Script on Each Destination Node.
Step 4: Launch the Configuration Wizard.

How do I start and stop my RAC database?

Stopping and Starting RAC Services

emctl stop dbconsole.
srvctl stop listener -n racnode1.
srvctl stop database -d RACDB.
srvctl stop asm -n racnode1 -f.
srvctl stop asm -n racnode2 -f.
srvctl stop nodeapps -n racnode1 -f.
crsctl stop crs.

What is CSSD and Crsd in Oracle RAC?

The CSSD was responsible for cluster synchronization, cluster membership, and group membership; EVMD handled event messaging for the processes; and CRSD managed the resources. Resource management such as start, stop, and monitor was done using scripts and processes that came under the RACG label.

What are the components of Oracle Clusterware?

The Oracle Clusterware includes two important components: the voting disk and the Oracle Cluster Registry (OCR). The voting disk is a file that manages information about node membership and the OCR is a file that manages cluster and Oracle Real Application Clusters (Oracle RAC) database configuration information.

What are Oracle Clusterware daemon processes and what they do?

The CRS daemon (crsd) manages cluster resources based on configuration information that is stored in Oracle Cluster Registry (OCR) for each resource. This includes start, stop, monitor, and failover operations. The crsd process generates events when the status of a resource changes.

How do I start a cluster?

Select the cluster you want to start or stop, and then take the following action. Click Start or Ripplestart to start the cluster. If your servers are stopped, select the Start option. Start launches the server process of each member of the cluster by calling the node agent for each server to start the servers.

How do I manually start CRS?

The basic steps to start the CRS include these startup actions:.

Enable the crs, css, and evm daemons in /etc/inittab.
Execute /etc/init.d/init.crs enable.
Execute /etc/init.d/init.crs start.
Execute $ORA_CRS_HOME/bin/crsctl start crs.

Is there a startup sequence diagram for RAC 11gR2?

For whoever that has worked with the 11gR2 version of RAC , has ran into the startup sequence diagram, this diagram is just disturbing to see, I don’t know about you, but for me is just unhelpful and not KISS. Then there is the second diagram available, which is way more clear, but in a very bad quality, you actually have to squint your eyes.

How does Oracle Clusterware bring up step by step?

Here is the brief explanation that how the clusterware brings up step by step . 1. When a node of an Oracle Clusterware cluster start/restarts, OHASD is started by platform-specific means. OHASD is the root for bringing up Oracle Clusterware. OHASD has access to the OLR (Oracle Local Registry) stored on the local file system.

Who is responsible for spawning CSSD in Oracle?

The full description, the really unreadable diagram and/or any updates to this you can find it in MOS Document 1053147.1 cssdagent – Agent responsible for spawning CSSD. orarootagent – Agent responsible for managing all root owned ohasd resources. oraagent – Agent responsible for managing all oracle owned ohasd resources.

Do you need ASM for Oracle Clusterware?

Oracle Clusterware does not rely on ASM to access the Voting Files, which means Oracle Clusterware does not need of Diskgroup to read and write on ASMDISK. It is possible to check for existence of voting files on a ASMDISK using the V$ASM_DISK column VOTING_FILE.