Oracle Grid Infrastructure CRS (cluster-ready service)

The main function of CRSD (cluster-ready service) is to manage application resources in the cluster to achieve high availability of cluster resources, and another part of CRSD is to manage OCR, including updates and backups of OCR.

CRSD operating mode

Step 1: Make a request on the client requesting the node, for example: a CRSCTL command.

Step 2: The UI module of the request node CRSD receives the corresponding request and sends the request to the PE module of the local node CRSD.

Step 3: The PE module of the local node after analyzing the action required by the request, the request is sent to the PE module of the PE master node.

Step 4:pe the PE module on the master node, after analyzing the received request, sends the action that needs to be performed to the agent module of the target node.

Step 5: The agent module of the target node notifies the local node that the corresponding agent process is operating on the resource.

Step 6; The agent process of the target node completes the operation of the resource and notifies the local node of the agent module.

Step 7: The agent module of the target node returns the result to the PE module of the PE master node.

Step 8:pe the PE module of the master node returns the result to the PE module that sent the request node.

Step 9: The PE module of the request node sends the return result of the command to the UI module of this node.

Step 10: The UI module of the request node sends the request results to the corresponding client.

Resources managed by CRSD

1) Public network resources: (Ora.net<n>.network)

2) VIP Resources: Node VIP resources (ora.< section name >.vip), SCAN VIP resources (ORA.SCAN<1-3>.VIP)

3) Listener Resource: Node Listener (ora.< section name >.lsnr), Scan Listener (ORA.<SCAN_LISTENER>.LSNR)

4) ONS resources: (ora.ons)

5) ASM Proxy resources: (ORA.ASM)

6) Disk Group resource: (ora.< disk group name >.DG)

7) Database resources: (ora.< database name >.db)

8) Database Service resources: (ora.< database name >.< service name >.svc)

9) CVU Resources (ORA.CVU)

Oracle Grid Infrastructure CRS (cluster-ready service)