This list may be empty if all voting files were corrupted, or the list may have OCR and Voting Disks in RAC Complete Understanding - YouTube When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Each successive run of this command must point to a different file location. If a resource fails, then before attempting to restore OCR, restart the resource. 1 The QUORUM DISK can only contain the "voting file". Administering OCR is decribed in the following topics: Migrating The Oracle Clusterware includes two important components: the voting disk and the Oracle Cluster Registry (OCR). If you cannot resolve the problem that caused the CLSD message, then run the command, "Administering Oracle Cluster Registry with Export and 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. The ocrconfig -export and ocrconfig -import commands are compatible. The voting disk is a file that manages information about node membership, and the OCR is a file that manages . The only configured Oracle ASM OCR location, which is on a different Oracle ASM disk group than the Oracle ASM OCR backup location, cannot be removed. high redundancy for OCR, you must configure the disk group with high Oracle ASM on all nodes in the cluster. sections. 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. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Run the following It's store information to manage Oracle cluster-ware and it's component such as RAC database, listener, VIP,Scan IP & Services. But as information regarding the nodes is in OCR/OLR too and system . If the crsd process running on the node affected by the Oracle ASM instance failure is the OCR writer, the majority of the OCR locations are stored in Oracle ASM, and you attempt I/O on OCR during the time the Oracle ASM instance is down on this node, then crsd stops and becomes inoperable. To add OCR to an Oracle ASM disk group, ensure that the, To remove storage configurations no longer in use, run the following command as, Ensure the upgrade to Oracle Clusterware 12. If it is, stop it by running the following command as a member of the Administrators group: Do not use the -init flag in any other command. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. file by using the -import option, which is explained in "Administering Oracle Cluster Registry with Export and Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. dd if=backup_file_name of=voting_disk_name. 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. For Oracle Clusterware files, a normal redundancy disk group requires a minimum of three disk devices (two of the three disks are used by failure groups and all three disks are used by the quorum failure group) and provides three voting files and one OCR and mirror of the OCR. rev 2023.6.6.43481. unless directed to do so by My Oracle Support. Using the crsctl replace votedisk command, you can move a given set of voting files from one Oracle ASM disk group into another, or onto a certified file system. Use the following procedure to restore OCR in an Oracle Restart environment: Stop Oracle High Availability Services by running the following command on all of the nodes: Run the ocrcheck -config command to determine the OCR location and then create an empty (0 byte) OCR location with appropriate permissions in that location. If you are storing OCR on an Oracle ASM disk group, and . that these OCR devices are valid. Use the following procedure to restore OCR on Linux or Unix voting disk Vs OCR user3266490 Aug 17 2009 — edited Aug 17 2009 Hi, How the voting disk differ from the OCR. improvements in managing Oracle Clusterware storage. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. 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. Thanks for contributing an answer to Database Administrators Stack Exchange! loss of one or more failure groups. In general, a flex disk group enables users to manage storage at the granularity of the database, in addition to at the disk group level. must create an empty (0 byte) OCR location with the same When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. If you did not create this disk group during installation, then the data files will be co-located with the OCR and voting files. Recover OCR by running the Managing Oracle Cluster Registry and Voting Files The effective disk space in a high redundancy disk group is one-third the sum of the disk space in all of its devices. You can remove an OCR location to reduce OCR-related overhead or to stop mirroring your OCR because you moved OCR to redundant storage such as RAID. 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". The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. Ensure that the Oracle ASM disk group that you specify exists and is mounted. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. In Oracle Database 12c Release 2 (12.2), the placement of OCR and voting disk files directly on a shared file system was desupported. The QUORUM DISK can only contain the "voting file". Administering Oracle Clusterware Components Use the procedure in this section to add an OCR location. failure group. 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. 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. You can manually mirror OCR, as described in the Adding an Oracle Cluster Registry Location section, if you: Upgraded to Oracle Clusterware 12c but did not choose to mirror OCR during the upgrade, Created only one OCR location during the Oracle Clusterware installation. 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. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. resource. Once you configure voting files on Oracle ASM, you can only make changes to the voting files' configuration using the crsctl replace votedisk command. The best answers are voted up and rise to the top, Not the answer you're looking for? and later releases. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. You cannot restore your configuration from an OCR backup If you configure a mirrored OCR and if Oracle Clusterware cannot access the mirrored OCR locations and also cannot verify that the available OCR location contains the most recent configuration, then Oracle Clusterware prevents further modification to the available OCR location. The default backup location for the OLR is in the path Grid_base/crsdata/host_name/olr/. Edit /var/opt/oracle/ocr.loc on all nodes and set up ocrconfig_loc=new OCR device. Backups are created when the system is online. What is the difference between OCR and voting disk? Our storage is EMC SAN. Use this procedure to restore OCR on Linux or Unix systems. 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. Mirroring can help prevent OCR from becoming a single point of failure. c)A node must be able to access more than half of the voting disks at any time. 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. OCR and Voting disk backup and recovery strategies - Blogger Run the following command on any node in the cluster to remove an OCR location from either Oracle ASM or other location: The file_name variable can be a device name or a file name. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. voting disk Vs OCR - Oracle Forums Use ASMCA to create an Oracle ASM disk group that is at least the same size of the existing OCR and has at least normal redundancy. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. 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. What is OCR and voting disk in RAC? 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. Oracle Clusterware includes two important components that manage configuration and node membership: Oracle Cluster Registry (OCR), which also includes the local component Oracle Local Registry (OLR), and voting files. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. Multiple processes on each node have simultaneous read and write access to the OLR particular to the node on which they reside, regardless of whether Oracle Clusterware is running or fully functional. Oracle Clusterware can manage up to five redundant OCR locations. Hi all, What is the difference b/w OCR and Voting Disk. If any node is not passing heat-beat across other note or voting disk, then that node will be evicted by Voting disk. You can configure voting disks on Oracle ASM, or you can configure voting disks on shared storage. To upgrade to Oracle Clusterware 12c from a previous Oracle Clusterware release on which you were using raw or block devices, you must migrate OCR and voting files to Oracle Automatic Storage Management (Oracle ASM) or a shared file system before you upgrade. 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. 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. Repairing an OCR involves either adding, deleting, or replacing an OCR location. What is the difference between start and enable in the Oracle RAC srvctl? An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. 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. Use the following procedure to import OCR on Linux or UNIX systems: Check whether crsd is running. group, then stop the Oracle Clusterware daemon: If the preceding command returns any error At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. If you configure a mirrored OCR and if Oracle Clusterware cannot access the mirrored OCR locations and also cannot verify that the available OCR location contains the most recent configuration, then Oracle Clusterware prevents further modification to the available OCR location. Recover the Oracle voting disk when its backup is missing 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. Can you have more than 1 panache point at a time? To add one or more voting files, run the following command, replacing the path_to_voting_disk variable with one or more space-delimited, complete paths to the voting files you want to add: To replace voting file A with voting file B, you must add voting file B, and then delete voting file A. How to Backup OCR and Voting Disk - Ed's Logic A witness (former gov't agent) knows top secret USA information. ./crsctl stop crs (use -f flag if you have any issues. To manage OCR and the Oracle Local Registry (OLR), use 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. 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. Use this procedure to restore OCR on Windows systems. OCR contains information about all Oracle resources in the cluster. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. run must point to a different disk group. At any time after the initial backup, you can manually back up OLR. "Adding, Deleting, or Migrating Voting Files", What developers with ADHD want you to know, MosaicML: Deep learning models for sale, all shapes and sizes (Ep. Overriding OCR using the following procedure can result in the loss of OCR updates that were made between the time of the last known good OCR update made to the currently accessible OCR and the time at which you performed the overwrite. If you are importing OCR to a cluster or network file system, then skip to step 7. 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. If the original OCR location does not exist, then you must create an empty (0 byte) OCR location with the same name as the original OCR location before you run the ocrconfig -restore command. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. Because Oracle ASM does not mirror data in an external redundancy disk group, Oracle recommends that you use external redundancy with storage devices such as RAID, or other similar devices that provide their own data protection mechanisms. In the prior releases of Oracle, the Oracle Cluster Repository (OCR) and Voting Disks were on raw devices. As the root user, run the following command to add an OCR location to either Oracle ASM or other storage device: To remove an OCR location or a failed OCR location, at least one other OCR must be online. The quorum failure group is used to ensure that a quorum of the specified failure groups are available. Ensure that the OCR backup location is not configured on an Oracle ASM disk group. You should configure OCR in two independent disk groups. Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as root: The -nocrs option ensures that the crsd process and OCR do not start with the rest of the Oracle Clusterware stack. Oracle also recommends that you create a new backup when you migrate OCR from Oracle ASM to other storage, or when you migrate OCR from other storage to Oracle ASM. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. this newly-created OCR location. ASM disk groups, but you cannot change to a local file system. A high redundancy disk group must contain at least three failure groups. The following example shows how to migrate two OCRs to Oracle ASM using 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. How do you find out what OCR backups are available? Restoring Voting Disks Run the following command as root from only one node to start the Oracle Clusterware stack in exclusive mode, which does not require voting files to be present or usable: To remove a voting file, run the following command, specifying one or more space-delimited, voting file FUIDs or comma-delimited directory paths to the voting files you want to remove: If the cluster is down and cannot restart due to lost voting files, then you must start CSS in exclusive mode by running the following command, as root: After you start CSS in exclusive mode, you can replace the voting file, as follows: To migrate voting files to Oracle ASM, specify the Oracle ASM disk group name in the following command: After modifying the voting file, verify the voting file location, as follows: Clusterware Administration and Deployment Guide. dd if=voting_disk_name of=backup_file_name. The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. || Node Eviction and Node Eviction - Master and Slave - YouTube Hello Friends,Here with one more topic on database administration. Look at output from the ocrdump command and determine whether it has your latest updates. Only after you use the replace verb to move voting disks back to non-Oracle ASM storage are the verbs add css votedisk and delete css votedisk again usable.