This step is necessary only if OCR is also corrupted or otherwise unavailable, such as if OCR is on Oracle ASM and the disk group is no longer available. Hi all, What is the difference b/w OCR and Voting Disk. --add the new diskgroup with root user. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; A voting disk is a file that manages information about node membership. c)A node must be able to access more than half of the voting disks at any time. 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. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. (Both primary and mirrors) 2. My test systems OLR files has about 651 keys. Each successive run of this command must point to a different file location. 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. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. If it is, then stop it by running the following command as root: If you want to restore OCR to an Oracle ASM disk group, then you must first create a disk group using SQL*Plus that has the same name as the disk group you want to restore and mount it on the local node. Voting files which record node membership information. 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. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". Our storage is EMC SAN. It is used to process data from printed forms. A normal redundancy disk group must contain at least two failure groups but if you are storing your voting disks on Oracle ASM, then a normal redundancy disk group must contain at least three failure groups. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. If you upgrade from a previous version of Oracle Clusterware to Oracle Clusterware 11g release 2 (11.2) and you want to store voting disks in an Oracle ASM disk group, then you must set the ASM Compatibility (COMPATIBLE.ASM) compatibility attribute to 11.2.0.0. OCR contains information about all Oracle resources in the cluster. 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. 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. Helpful tips . What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? OLR is located on local storage on each node in a cluster. col name for a20 "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. Oracle ASM on ScaleIO Best Practices - Dell Technologies 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. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. 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. Oracle recommends that you use Oracle ASM to store OCR and voting disks. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. Move the OCR to new diskgroup. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'techgoeasy_com-box-4','ezslot_3',192,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-box-4-0');1)If it is stored in ASM, no need to configure manually as the files will be created depending on the redundancy in ASM. 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. However, Oracle recommends using several failure groups. Below is a table of differentiation between Optical Mark Reader (OMR) and Optical Character Reader (OCR): Difference between Optical Character Recognition (OCR) and Magnetic Ink Character Reader (MICR), Difference Between Electric Potential and Potential Difference, Difference between EMF and Potential Difference, Difference between Voltage Drop and Potential Difference, Difference between Difference Engine and Analytical Engine, Difference Between Single and Double Quotes in Shell Script and Linux, Difference between Time Tracking and Time and Attendance Software, Difference and Similarities between PHP and C, Similarities and Difference between Java and C++. It is useful in grading, calculating marks, etc. You can manually put the mirrored OCRs on a shared network file system (NFS), or on any cluster file system that is certified by Oracle. An FRA diskgroup that holds archivelogs and backups. I am installing two node Oracle 11gR1 RAC on Solaris. Oracle Cluster Registry (OCR) which records cluster configuration information. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. You can just replace with new voting file on disk group DATA. difference between OCR and voting disk 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. col header_status for a20 --With Spmove command we will move the spfile This process is called DISK HEARTBEAT. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. Optical Character Reader (OCR) is used to convert different types of documents such as scanned paper documents, PDF files or images captured by a digital camera into machine-encoded text. Oracle Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. 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 recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Is it illegal to lie about a felony on an application? 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. 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. Check whether crsd is running. 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. At least two OCR locations if OCR is configured on an Oracle ASM disk group. You cannot inspect the contents of an export. Your email address will not be published. Disk heartbeat is successful, but network heartbeat is missed.3. OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. A small number of failure groups, or failure groups of uneven capacity, can create allocation problems that prevent full use of all of the available storage. If you move voting disks from one Oracle ASM disk group to another, then you can change the number of voting disks by placing them in a disk group of a different redundancy level as the former disk group. When any node is not able to send a heartbeat to the voting disk, then it will reboot itself.For high availability, Oracle recommends that you have a minimum of three voting disks. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. To restore an OCR when clusterware is down. Using the crsctl replace votedisk command, you can move a given set of voting disks from one Oracle ASM disk group into another, or onto a certified file system. If this problem is local to only one node, you can use other nodes to start your cluster database. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. 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). Break-in heartbeats indicate a possible error scenario. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. 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. 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. Ocr Voting files. Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). 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. Use the following procedure to restore OCR on Linux or UNIX systems: List the nodes in your cluster by running the following command on one node: Stop Oracle Clusterware by running the following command as root 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 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 root to restore OCR with an OCR backup that you can identify in "Listing Backup Files": After you complete this step, proceed to step 10. Oracle Clusterware uses voting files to determine which nodes are members of a This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. select path,name,header_status from v$asm_disk At any one time, Oracle Database always retains the last three backup copies of OCR. For a full experience use one of the browsers below. 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. 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.