How do you find out what OCR backups are available?
First check exact location of automatic OCR backup location using “ocrconfig -showbackup” command. Because this automatic backup of OCR is physical copies of Oracle Cluster Registry. There is no need to bring down Cluster to take this physical backup of OCR.
How do I backup my OCR and voting disk?
How to Backup OCR and Voting Disk
- OCR Dumps. Oracle provides an utility ocrconfig to export OCR data to a dump file like this:
- OCR Backups. Since 11g (11.1), the clusterware backs up OCR automatically every 4 hours by Cluster Ready Services Daemon (CRSD).
- Use dd Command.
- Rely on OCR Backups.
What is the difference between OCR and voting disk?
The voting disk is a file that manages information about node membership, and the OCR is a file that manages cluster and Oracle RAC database configuration information. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage.
How do I restore my OCR?
Use the following steps to restore the voting disk from the OCR backup.
- Step 1: Disable the CRS automatic start service.
- Step 2: Restart the node.
- Step 3: Verify that the CSR service did not start.
- Step 4: Clear the header of the voting disk.
- Step 5: Start the cluster.
- Step 6: Start the ASM with a PFILE.
Who will manage OCR files?
You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices.
What is OCR file in Oracle RAC?
OCR manages Oracle Clusterware and Oracle RAC database configuration information. OLR resides on every node in the cluster and manages Oracle Clusterware configuration information for each particular node. Voting disks manage information about node membership.
What is the use of OCR in Oracle?
OCR contains information about all Oracle resources in the cluster. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. It contains manageability information about Oracle Clusterware, including dependencies between various services.
What is difference between OCR and OLR in RAC?
ORACLE LOCAL REGISTRY(OLR) contains node-specific information required by OHASD . Every node has its own dedicated OLR file. (not shared between the nodes). As OCRs files are present in ASM diskgroup, While starting the CRS, it wont be able to Access OCR file to find the cluster resource information.
What is the use of OCR file in Oracle RAC?
The purpose of the Oracle Cluster Registry (OCR) is to hold cluster and database configuration information for RAC and Cluster Ready Services (CRS) such as the cluster node list, and cluster database instance to node mapping, and CRS application resource profiles.
How do you rebalance Diskgroup in ASM?
You can manually rebalance the files in a disk group using the REBALANCE clause of the ALTER DISKGROUP statement. This would normally not be required, because Oracle ASM automatically rebalances disk groups when their configuration changes.
What is OCR file in Oracle?
What is rebalance power in ASM?
Whenever there is a disk added/removed/resized, ASM starts to rebalance the data on the disks in the disk group. The power with which it does the rebalancing is the rebalancing power. The rebalance power defaults to the value of the ASM_POWER_LIMIT initialization parameter (default value = 1).
What is striping and mirroring in ASM?
Striping spreads each file extent evenly across all disks in the assigned disk group. ASM also provides automatic mirroring of ASM files and allows the mirroring level to be specified by group. This mirroring occurs at the extent level.