OCR and Voting 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. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' If you run the ocrconfig -add | -repair | -replace command, then the device, file, or Oracle ASM disk group that you are adding must be accessible. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. By using our site, you The Oracle Clusterware has the OCR and voting disks open and is actively using them. 3. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Oracle Oracle does not support having voting disks in Oracle ASM and directly on a cluster file system for the same cluster at the same time. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. [grid@NODE01 ~]$ asmcmd spmove '+OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136' '+OCR_NEWDG/RAC-cluster/spfileASM.ora', --Verify Hi, How the voting disk differ from the OCR. List the Candidate Disk present for creating DISKGROUP. To replace or move the location of an OCR device, 4. Voting disk management requires a valid and working OCR. In this case, a message to this effect is written in the KILL BLOCK of the node. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. Successfully replaced voting disk group with +OCR_NEWDG. Oracle Automatic Storage Management Administrator's Guide, Oracle Grid Infrastructure Installation Guide, "Troubleshooting Oracle Cluster Registry", "Adding an Oracle Cluster Registry Location", "Replacing an Oracle Cluster Registry Location", "Repairing an Oracle Cluster Registry Configuration on a Local Node", "Removing an Oracle Cluster Registry Location", Appendix G, "Oracle Cluster Registry Utility Reference", "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands", Appendix A, "Cluster Verification Utility Reference", "Adding, Deleting, or Migrating Voting Disks". If it is, stop it by running the following command as root: Import OCR by running the following command as root: If you are importing OCR to a cluster or network file system, then skip to step 7. What are Consumer Forums and what is their importance? Oracle ASM on ScaleIO Best Practices - Dell Technologies col path for a30 When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. col name for a20 3) CSSD process in each RAC maintains the heartbeat in a block of size 1 OS block in the hot block of the voting disk at a specific offset. OCR and Voting Disk However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE For example, if you ran the ocrconfig -restore command on node 1 of a four-node cluster, then you must run the ocrconfig -repair -replace command on nodes 2, 3, and 4. Worked as a Development and Database Administrator. Nytro.ai uses technology that works best in other browsers. 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. In a nutshell, OCR is used by CRSd and OLR by the OHASd. It is hard to implement as compared to OMR. To restore an OCR when clusterware is down. OCR is more commonly used than Voting Disk. To migrate voting disks from Oracle ASM to an alternative storage device, specify the path to the non-Oracle ASM storage device with which you want to replace the Oracle ASM disk group using the following command: You can run this command on any node in the cluster. Ensure that the Oracle ASM disk group that you specify exists and is mounted. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. Our storage is EMC SAN. Verify the VotingDisk movement on both nodes. To replace all voting disks not stored in Oracle ASM with voting disks managed by Oracle ASM in an Oracle ASM disk group, run the following command: Modifying voting disks that are not stored on Oracle ASM: To display the voting disk FUID and file path of each current voting disk, run the following command: This command returns a disk sequence number, the status of the disk, the FUID, and the path of the disk and no name of an Oracle ASM disk group. (LogOut/ Ensure that the Oracle ASM disk group you specify exists and is mounted. Oracle Automatic Storage Management Administrator's Guide for more information about disk group redundancy and quorum failure groups, "Adding, Deleting, or Migrating Voting Disks" for information about migrating voting disks. A high redundancy disk group must contain at least three failure groups. However, if you are unable to start any cluster node in your environment and if you can neither repair OCR nor restore access to all OCR locations, then you can override the protection mechanism. For example, if any node that is part of your current Oracle RAC cluster is shut down, then you must update the OCR configuration on the stopped node to let that node rejoin the cluster after the node is restarted. CREATE DISKGROUP OCR_NEWDG NORMAL REDUNDANCY The visually impaired people find it useful. When the clusterware stack is down on all nodes in the cluster, the backups that are listed by the ocrconfig -showbackup command may differ from node to node. For a full experience use one of the browsers below. In addition, with numerous nodes, there are other possible scenarios too. Please contact us at contactus@smarttechways.com, How to get DDL of Tablespace present in OracleDatabase, Follow Smart way of Technology on WordPress.com, Exclude/Include option in EXPDP and IMPDP Datapump, Create & grant permission to directory in Oracle, Check the Undo tablespace Usage in Oracle, Check datafiles and tablespace information in Oracle, Check the Patch Applied to the Oracle Database, Stop the EXPDP/IMPDP Datapump Job in Oracle, Find top CPU Consuming Session or SQLs query in Oracle. user13389425 Sep 7 2010 edited Sep 7 2010. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). OCR and voting disk Use the procedure in this section to add an OCR location. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. You can manually mirror OCR, as described in the "Adding an Oracle Cluster Registry Location" section, if you: Upgraded to Oracle Clusterware 11g release 2 (11.2) but did not choose to mirror OCR during the upgrade, Created only one OCR location during the Oracle Clusterware installation. 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. Helpful tips . -- Mount diskgroup By default, the -showbackup option displays information for both automatic and manual backups but you can include the auto or manual flag to display only the automatic backup information or only the manual backup information, respectively. Ensure there is at least 280 MB of space on the mount partition. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option. For example, if you have configuration problems that you cannot resolve, or if you are unable to restart Oracle Clusterware after such changes, then restore your configuration using the procedure for your platform. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. In this case, it is a little more difficult because:1. Hi, I am working in IT industry with having more than 10 year of experience, worked as an Oracle DBA with a Company and handling different databases like Oracle, SQL Server , DB2 etc Once an OCR location is created, it does not get updated in the Oracle Restart environment. How do you write a referee report for a job application? As shown in the image, there is a co-relation between Voting Disk, OCR and ASM Diskgroup such that during startup, CSS process reads the voting file and signals the CRSD to start. If it is, stop it by running the following command as a member of the Administrators group: Import OCR by running the following command as a member of the Administrators group: In Oracle Clusterware 11g release 2 (11.2), each node in a cluster has a local registry for node-specific resources, called an Oracle Local Registry (OLR), that is installed and configured when Oracle Clusterware installs OCR. Comments. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. 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. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. An advanced recognition engine is needed for OCR compared to OMR. FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. Ocr OMR technology scans a printed form and reads from predefined positions. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Cluster management is now affected on this particular node. Please sign in to comment Oracle Cluster Registry Oracle ASM on ScaleIO Best Practices - Dell Technologies where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. You can check the status of OLR on the local node using the OCRCHECK utility, as follows: You can display the content of OLR on the local node to the text terminal that initiated the program using the OCRDUMP utility, as follows: You can perform administrative tasks on OLR on the local node using the OCRCONFIG utility. Move the VotingDisk to new diskgroup. This means that a device must exist. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. External redundancy: A disk group with external redundancy can store only one voting disk, Normal redundancy: A disk group with normal redundancy stores three voting disks, High redundancy: A disk group with high redundancy stores five voting disks. difference between OCR and voting disk If we are not using a voting disk, then due to network failure, nodes are neither able to communicate with each other nor synchronize with the database, this situation is called a cluster SPLIT-BRAIN problem. If you store OCR on an Oracle ASM disk group and the disk group is not available, then you must recover and mount the Oracle ASM disk group. It was first used in 1914 to help blind people in reading. ocrdump should be executed as root to display all the keys available. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. Oracle Local Registry is OCRs local counterpart. Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents: Run the following command to recover a voting disk where backup_file_name is the name of the voting disk backup file and voting_disk_name is the name of the active voting disk: Hope you like the information onvoting disks in RAC. Save my name, email, and website in this browser for the next time I comment. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. OCR and Voting Disk To display the voting disk FUID and file path of each current voting disk, run the crsctl query css votedisk command to display output similar to the following: This command returns a disk sequence number, the status of the disk, the FUID, the path of the disk, and the name of the Oracle ASM disk group on which the disk is stored. WebOCR and Voting Disk. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. --Connect with SQLPLUS ASM instance select path,name,header_status from v$asm_disk This section describes how to back up OCR content and use it for recovery. Because the default backup is on a local file system, Oracle recommends that you include the backup file created with the OCRCONFIG utility as part of your operating system backup using standard operating system or third-party tools. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the cluster resources. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. Break-in heartbeat indicates a possible error scenario. OMR technology scans a printed form and reads from predefined positions. You cannot directly influence the number of voting disks in one disk group. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. The two file formats are incompatible and must not be interchangeably used. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. OCR Make sure that xdpyinfo exist under PATH variable. When using a mix of storage pools with both high capacity spinning disks and high performance solid state devices additional diskgroups should be considered, which correspond to the different performance storage pools. Find the temp usage by sessions in Oracle. It stands for Optical Character Reader or Optical Character Recognition. If you choose to store the voting disks on a cluster file system, then select the option to configure multiple voting disks, in which case you will have to specify three different file systems based on different disks. Ensure that the most recent OCR contains the latest OCR updates. These files can be stored either in ASM or in shared storage. Look at output from the ocrdump command and determine whether it has your latest updates. 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 It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. In addition to mirroring OCR locations, you can also: Replace an OCR location if there is a misconfiguration or other type of OCR error, as described in the "Replacing an Oracle Cluster Registry Location" section. Configure voting files on Oracle ASM or on shared storage. 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. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. 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. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. It contains manageability information about Oracle Clusterware, including dependencies between various services. col header_status for a20 Attempt to correct the problem using the OCR restoration procedure for your platform. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. It was introduced in 11gR2, and is not shared by any other node in the cluster. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. OCR and Voting Disk OLR is located on local storage on each node in a cluster. Network heartbeat is successful, but disk heartbeat is missed.2. Run the following command to verify the current running version: Use the Oracle ASM Configuration Assistant (ASMCA) to configure and start Oracle ASM on all nodes in the cluster. Few possible scenarios:1. on Oct 5 2010. 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. Check the location of OCR Disk from GRID Home with root user. This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. Recover the Oracle voting disk when its My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. Oracle Cluster Registry (OCR) which records cluster configuration information. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. difference between OCR and voting disk Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. ERROR: Unable to verify the graphical display setup. Move the SPFILE to newdiskgroup. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The Oracle installation process for Oracle Clusterware gives you the option of automatically mirroring OCR. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. If this problem is local to only one node, you can use other nodes to start your cluster database. As a definitive verification that OCR failed, run ocrcheck and if the command returns a failure message, then both the primary OCR and the OCR mirror have failed. To add the file as an OCR location, ensure that the Oracle Clusterware stack is running and run the following command as root: You can run this command more than once if you add more than one OCR location.