The goal of this note is to provide steps to add, remove, replace or move an Oracle Cluster Repository (OCR) and/or Voting Disk in Oracle Clusterware 10gR2, 11gR1 and 11gR2 environment. WebOCR and Voting Disk. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. If you have only one OCR location configured and online, then you must first add a new location and then delete the failed location, as follows: It may be necessary to repair OCR if your cluster configuration changes while that node is stopped and this node is the only member in the cluster. To add one or more voting disks, run the following command, replacing the path_to_voting_disk variable with one or more space-delimited, complete paths to the voting disks you want to add: To replace voting disk A with voting disk B, you must add voting disk B, and then delete voting disk A. Voting files. Important points about Voting disks in Oracle RAC. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. The voting disk is a file that manages information about node membership, and the OCR is a file that manages the cluster and Real Application Clusters (RAC) database configuration information. cluster. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. (Both primary and mirrors) 2. It is used in scanning and converting different types of documents. In a nutshell, OCR is used by CRSd and OLR by the OHASd. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. This is true even in cases where there are no working voting disks. This section describes how to administer OCR in the following topics: Migrating Oracle Cluster Registry to Oracle Automatic Storage Management, Adding, Replacing, Repairing, and Removing Oracle Cluster Registry Locations, Diagnosing Oracle Cluster Registry Problems, Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands, Upgrading and Downgrading the Oracle Cluster Registry Configuration. It was introduced in 11gR2, and is not shared by any other node in the cluster. This section includes the following topics: Adding an Oracle Cluster Registry Location, Removing an Oracle Cluster Registry Location, Replacing an Oracle Cluster Registry Location, Repairing an Oracle Cluster Registry Configuration on a Local Node, Overriding the Oracle Cluster Registry Data Loss Protection Mechanism. Rely on OCR Backups Since 11g (11.2), the voting disk data is automatically backed up in OCR as part of any configuration change and is automatically restored to any voting disk added. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. Is it illegal to lie about a felony on an application? Use the following command syntax as root on the restarted node where you use either a destination_file or +ASM_disk_group to indicate the current and target OCR locations: This operation only changes OCR on the node on which you run this command. Just one node is unhealthy. 11gR2 can have upto five mirrored copies of OCR. Restore OCR by running the following command as root: Run the ocrcheck command to verify the integrity of OCR: Start Oracle High Availability Services by running the following command on all of the nodes: You can use the OCRDUMP and OCRCHECK utilities to diagnose OCR problems. In addition to using the automatically created OCR backup files, you should also export OCR contents before and after making significant configuration changes, such as adding or deleting nodes from your environment, modifying Oracle Clusterware resources, and upgrading, downgrading or creating a database. The ocrconfig -export and ocrconfig -import commands are compatible. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Hi, How the voting disk differ from the OCR. To add a new disk and remove the existing disk, run the following command, replacing the path_to_voting_diskB variable with the fully qualified path name of voting disk B: The -purge option deletes existing voting disks. col path for a30 Modifying voting disks that are stored in Oracle ASM. You can run this command more than once if there is more than one OCR location configured. Repair an OCR location if Oracle Database displays an OCR failure alert in Oracle Enterprise Manager or in the Oracle Clusterware alert log file, as described in the "Repairing an Oracle Cluster Registry Configuration on a Local Node" section. We and our partners share information on your use of this website to help improve your experience. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. Run the following command to inspect the contents and verify the integrity of the backup file: You can use any backup software to copy the automatically generated backup files at least once daily to a different device from where the primary OCR resides. When you repair OCR on a stopped node using ocrconfig -repair, you must provide the same OCR file name (which should be case-sensitive) as the OCR file names on other nodes. Begin to start Oracle Clusterware by running the following command as root on all of the nodes: Verify OCR integrity of all of the cluster nodes that are configured as part of your cluster by running the following CVU command: Use the following procedure to restore OCR on Windows systems: Stop Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: If the preceding command returns any error due to OCR corruption, stop Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as a member of the Administrators group: Restore OCR with the OCR backup file that you identified in "Listing Backup Files" by running the following command as a member of the Administrators group: Make sure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. c)A node must be able to access more than half of the voting disks at any time. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. The main difference between OCR and Voting Disk is that OCR is used to convert scanned images of text into digital text, while Voting Disk is used to store the ballot information for an election. If you must change an existing OCR location, or change a failed OCR location to a working location, then you can use the following procedure, as long as all remaining OCR locations remain online. Change), You are commenting using your Facebook account. Nytro.ai uses technology that works best in other browsers. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. Move the SPFILE to newdiskgroup. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. For a full experience use one of the browsers below. on Oct 5 2010. Oracle recommends that you do not use more than five voting files, Following are the steps to move OCR, Voting Disk and Spfile to new disk group. WebOCR 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 Oracle Grid Infrastructure Installation Guide for information about creating OCRs, Oracle Automatic Storage Management Administrator's Guide for more information about Oracle ASM disk group management. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. -- Mount diskgroup You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. In this case, it is a little more difficult because:1. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. Added on Sep 7 In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. Please sign in to comment You should configure OCR in two independent disk groups. The ocrconfig -replace command requires that at least two OCR locations are configured. To change an Oracle Cluster Registry location: Use the OCRCHECK utility to verify that a copy of OCR other than the one you are going to replace is online, using the following command: OCRCHECK displays all OCR locations that are registered and whether they are available (online). It is the rapid method of data entry. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. List the Candidate Disk present for creating DISKGROUP. Generally, the following information is found in the OLR. The text to speech can be used by them. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Make sure that xdpyinfo exist under PATH variable. Note that the commands you use to do this are different, depending on whether your voting disks are located in Oracle ASM, or are located in another storage option. Disk Group ocr_newdg is running on node01,node02, 8. If you scroll through the key names below you will observe that most of the information pertains to the local resources required by OHASd (refer to the flow chart in the earlier post to see which values this file would hold). Begin to start Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: Run the following Cluster Verification Utility (CVU) command to verify OCR integrity of all of the nodes in your cluster database: OCR is present for backward compatibility.
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