What's the correct way to think about wood's integrity when driving screws? rest of the Oracle Clusterware stack. On Windows, use a dir command if the OCR location is a file and run GuiOracleObjectManager.exe to verify that the part of the cluster with the name exists. High redundancy: In a high redundancy disk group, Oracle ASM uses three-way mirroring to increase performance and provide the highest level of reliability. 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. It contains manageability information about Oracle Clusterware, including dependencies between various services. OCR location to another disk group to avoid the loss of OCR, if disk group exists and is mounted. OCR is more commonly used than Voting Disk. sections. Ensure that the file you created is visible from all nodes in the cluster. Contradictory references from my two PhD supervisors. /home/oracle/.bash_profile [root@primary01 ~]# cd /backup/ [root@primary01 backup]# ocrconfig -export ocr_backup_`date +%Y%m%d`.dmp node. OCRCHECK. The OCR location that you are replacing can be either online or offline. You can find the location of the OCRFILE using one of the tow methods below. This may result in an OCR location that has contents that do not match the state of the rest of your system. The effective disk space in a normal redundancy disk group is half the sum of the disk space in all of its devices. This post has been answered by user00726 on Sep 7 2010. What is the difference between start and enable in the Oracle RAC srvctl? OCR and Voting Disk - Oracle Forums You can have up to five OCR locations. For example, if the OCR location is /dev/sde1, then use the command syntax ocrconfig -repair -add /dev/sde1 on this node to repair OCR on that node. Oracle Clusterware 19c and you want to store OCR in an Oracle ASM disk group, have failed. OCR has a mechanism that prevents data loss due to accidental overwrites. Oracle recommends that you use either automatic or manual backups, and the ocrconfig -restore command instead of the ocrconfig -export and ocrconfig -import commands to restore OCR for the following reasons: A backup is a consistent snapshot of OCR, whereas an export is not. during the time the Oracle ASM instance is down on this node, You cannot customize the backup frequencies or the number of files that Oracle Database retains. Use the following procedure to import OCR on Linux or UNIX systems: Check whether crsd is running. 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. Mirroring can help prevent OCR from becoming a single point of failure. If the original OCR location does not exist, then you must create an empty (0 byte) OCR location with appropriate permissions before you run the ocrconfig -add or ocrconfig -replace commands. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. Voting Disk Internals | Oracle Database Internal Mechanism Voting Disk contains information regarding nodes in the cluster and the disk heartbeat information, CSSD of the individual nodes registers the information regarding their nodes in the voting disk and with that pwrite() system call at a specific offset and then a pread() system call to read the status of other CSSD processes. 3. If you choose to store your voting disks in Oracle ASM, then Oracle ASM stores all the voting disks for the cluster in the disk group you choose. group, then stop the Oracle Clusterware daemon: If the preceding command returns any error Clothes get messed up everytime I do some wood work cutting. 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. The following example shows how to migrate OCR from Oracle ASM to NAS using OCRCONFIG. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. ASM and a shared file system, except during a migration. Oracle Grid Infrastructure Installation and Upgrade Guide for information about creating OCRs. If you are importing OCR to a cluster or network file system, then skip to step 7. locations are stored in Oracle ASM, and you attempt I/O on OCR If a resource fails, then before attempting to restore OCR, restart the resource. Before you add, delete, replace, or restore voting files, run the ocrcheck command as root. In Oracle Clusterware 12c, 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. 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. unless directed to do so by My Oracle Support. To replace all voting files not stored in Oracle ASM with voting files managed by Oracle ASM in an Oracle ASM disk group, run the following command: To display the voting file FUID and file path of each current voting file, 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. Stop Oracle Clusterware on the node where it is running in exclusive mode: Run the ocrconfig -repair -replace command as root on all the nodes in the cluster where you did not the ocrconfig -restore command. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. If you move voting files from one Oracle ASM disk group to another, then you can change the number of voting files by placing them in a disk group of a different redundancy level as the former disk group. This section describes how to back up OCR content and use it for recovery. are mounted on all of the nodes in the cluster. The ocrconfig -replace command requires that at least two OCR locations are configured. You must instead use the -restore option, as described in the following sections. Start Oracle High Availability Services by running the following command on all of the nodes: Stop Oracle Clusterware by running the following command as, Import OCR by running the following command as. 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. For example: Oracle Clusterware backs up OLR after installation or upgrade and, by default, periodically backs up OLR, thereafter. To migrate OCR to Oracle ASM using OCRCONFIG: If OCR is stored in an Oracle ASM disk group with Manual backups: Run the ocrconfig -manualbackup command on a node where the Oracle Clusterware stack is up and running to force Oracle Clusterware to perform a backup of OCR at any time, rather than wait for the automatic backup. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. Oracle ASM. The following example shows how to migrate two OCRs to Oracle ASM using The QUORUM DISK can only contain the "voting file". Oracle ASM on all nodes in the cluster. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. How to Check Oracle Cluster Registry Issues, Restoring the Oracle Cluster Registry on Linux or Unix Systems, Restoring the Oracle Cluster Registry on Windows Systems, Restoring the Oracle Cluster Registry in an Oracle Restart Environment. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. If the original OCR location does not exist, then you must create an empty (0 byte) OCR location before you run the ocrconfig -import command. ./crsctl stop crs (use -f flag if you have any issues. ocrconfig -restore command. To restore OCR from a backup, you must instead use the -restore option, as described in "Backing Up Oracle Cluster Registry". RAC Basics : CRS, Voting Disk, OCR, Cache Fusion 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. If the OCR backup file is located 11.2.0.2, or later. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. The ocrconfig -export and ocrconfig -import commands are compatible. 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. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. Ensure that the Oracle ASM disk group that you specify exists and is mounted. -restore option, as described in the following The first method uses automatically generated OCR copies and the second method enables you to issue a backup command manually: Automatic backups: Oracle Clusterware automatically creates OCR backups every four hours. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. To migrate voting files 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. checks and guidelines. A failure group is a subset of the disks in a disk group. For Oracle Clusterware files, a high redundancy disk group requires a minimum of five disk devices (three of the five disks are used by failure groups and all five disks are used by the quorum failure group) and provides five voting files and one OCR and two mirrors of the OCR. Rac questions - SlideShare You must run the command as a user with administrative privileges. "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands" to use manually created OCR export files to copy OCR content and use it for recovery. Restore from one of the automatic physical backups using ocrconfig -restore. OCR and Voting Disks in RAC Complete Understanding - YouTube using the File Universal Identifier (FUID) obtained in the previous step: If the Oracle Clusterware stack is running in exclusive mode, then use the Check/Find Location and Status of Oracle OCR and VOTEDISK Perform the following procedure as the root user to remove an OCR location from your Oracle Clusterware environment: Ensure that at least one OCR location other than the OCR location that you are removing is online. Asking for help, clarification, or responding to other answers. Note: while the OCR and Voting disk files may be stored together, such as in OCFS (for example in pre-11.2 Clusterware environments) or in the same ASM diskgroup (for example in 11.2 Oracle Clusterware environments), OCR and Voting disk files are in fact two separate files or entities and so if the intention is to modify or move both OCR and Voting disk files, then one must follow steps . Oracle Clusterware changes to OCR and Voting file "Backup ... - LinkedIn and later releases. To downgrade, follow the downgrade instructions for Backups are created when the system is online. Recover the Oracle voting disk when its backup is missing Do this by using the ocrconfig -export command, which exports OCR content to a file format. on each node. information specific to each node. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. As a definitive verification that OCR failed, run ocrcheck. If all of the voting disks are corrupted, then you can restore them, as follows: Restore OCR as described in "Restoring Oracle Cluster Registry", if necessary. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. List the nodes in your cluster by running the following command on one node: Depending on whether OCR is located in an Oracle ASM disk group or on network attached storage (NAS), stop Oracle Clusterware by running one of the following commands as root on all of the nodes: If you are restoring OCR to a cluster file system or network file system, then run the following command as, Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as. In other words, running the ocrconfig -overwrite command can result in data loss if the OCR location that you are using to perform the overwrite does not contain the latest configuration updates for your cluster environment. Each successive run of this command must point to a different file location. Connect and share knowledge within a single location that is structured and easy to search. Restore the voting disk. 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. Learn how to check for Oracle Cluster Registry (OCR) issues, and how to QUIZ Section Difference between OMR and OCR lastbitcoder Read Discuss Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. an Oracle ASM disk group, then ensure that the Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. By default, Oracle ASM puts each voting file in its own failure group within the disk group. If you did not store voting disks in Oracle ASM, then run the following command using the File Universal Identifier (FUID) obtained in the previous step: Stop the Oracle Clusterware stack as root: Restart the Oracle Clusterware stack in normal mode as root: You can add, remove, and migrate voting disks after you install Oracle Clusterware. You cannot use the crsctl add | delete votedisk commands on voting disks stored in Oracle ASM disk groups because Oracle ASM manages the number of voting disks according to the redundancy level of the disk group. Create Oracle ASM Disks Without Installing Oracle. The voting disks and OCR are described as follows: Voting Disks. Use this procedure to restore OCR on Linux or Unix systems. You cannot use the crsctl add | delete votedisk commands on voting files stored in Oracle ASM disk groups because Oracle ASM manages the number of voting files according to the redundancy level of the disk group. If a resource fails, then before attempting to restore OCR, restart the 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. The following can be used to restore the voting disk from the backup file. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. resource. VDOMDHTMLtml> What OLR, OCR and Voting Disk in Oracle RAC? 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. OCR / Vote disk Maintenance Operations: (ADD/REMOVE/REPLACE/MOVE) If you are not restoring OCR to a files if those files are stored in a disk group that contains a quorum If you configure voting disks on Oracle ASM, then you do not need to manually configure . The Oracle Clusterware includes two important components: the voting disk and the Oracle Cluster Registry (OCR). group using Oracle ASM utilities, and then mount the disk group Oracle Clusterware automatically backs up voting file data in OCR as part of any configuration change and automatically restores the data to any voting file you add. Oracle ASM manages voting files differently from other files that it stores. If it is, stop it by running the following command as root: Do not use the -init flag with any other command. OCRCONFIG. Oracle does not support storing OCR on different storage types simultaneously, such as storing OCR on both Oracle ASM and a shared file system, except during a migration. Voting file management requires a valid and working OCR. The effective disk space in an external redundancy disk group is the sum of the disk space in all of its devices. 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. OCR has a mechanism that prevents data loss due to accidental overwrites. The best answers are voted up and rise to the top, Not the answer you're looking for? A high redundancy disk group must contain at least three failure groups. What is the difference between Schema and Database in Oracle? To change an Oracle Cluster Registry location: OCRCHECK displays all OCR locations that are registered and whether they are available (online). With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. You should configure OCR in two independent disk groups. rev 2023.6.6.43481. disk group, then you must set the ASM Compatibility disk group exists and is mounted. Oracle recommends that you configure multiple voting files during Oracle Clusterware installation to improve availability. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. Use the following procedure to restore OCR on Windows systems: 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: The -nocrs option ensures that the CRSD process and OCR do not start with the rest of the Oracle Clusterware stack. 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. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Can a court compel them to reveal the informaton? Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. dd if=voting_disk_name of=backup_file_name. then CRSD stops and becomes inoperable. Then each node uses its local copy of OCR and the local CRSd process to access it and communicate via the same local process if they need more updates from the physical OCR file. Once an OCR location is created, it does not get updated in the Oracle Restart environment. 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. Repairing an OCR involves either adding, deleting, or replacing an OCR location. By default, OLR is located at Use this procedure to restore OCR in an Oracle Restart environment. Failure groups define disks that share components, such that if one fails then other disks sharing the component might also fail. ASM disk group, then ensure that the Oracle ASM 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.
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