difference between ocr and voting disk

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 disks. The Oracle Clusterware has the OCR and voting disks open and is actively using them. on Oct 5 2010. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. How to Recreate Central Inventory in Real Applications Clusters, How to add any node to Oracle RAC cluster in 10g and 11g, Cluster command in Oracle clusterware 10g and 11g, How to check optimizer statistics preferences at the table level, All nodes in the RAC cluster register their heartbeat information in the voting disks/files. 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. Oracle Cluster Registry (OCR) which records cluster configuration information. It is used in scanning and converting different types of documents. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. Voting files. Voting disks contain static and dynamic data. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. It is used to process data from printed forms. Make sure that xdpyinfo exist under PATH variable. 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. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' CRS-4266: Voting file(s) successfully replaced, 9. When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. It stands for Optical Mark Reader or Optical Mark Recognition. 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. If the configurations do not match, run ocrconfig -repair. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". 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. OMR technology scans a printed form and reads from predefined positions. 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 I am installing two node Oracle 11gR1 RAC on Solaris. Restore Voting Disk Since we have restored OCR, we restored voting file as well. 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. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Change). Voting files. Both heartbeats failed. 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. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. It provides more accuracy as compared to OCR. Move the VotingDisk to new diskgroup. It is hard to implement as compared to OMR. 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. OCR stores Oracle Clusterware and Oracle RAC database configuration information 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. c)A node must be able to access more than half of the voting disks at any time. If the configurations match, ensure that the node can access all of the configured OCRs by running an ls command on Linux and UNIX systems. You cannot restore your configuration from an OCR backup file using the -import option, which is explained in "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands". --Connect with SQLPLUS ASM instance 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 However, Oracle recommends using several failure groups. Oracle Clusterware can manage up to five redundant OCR locations. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Learn how your comment data is processed. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. 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. If you choose to put the voting disks into an Oracle ASM disk group, then Oracle ASM ensures the configuration of multiple voting disks if you use a normal or high redundancy disk group. OCR stores configuration information in a series of key-value pairs in a tree structure. 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. 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. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. Each successive run of this command must point to a different file location. Comments. The text to speech can be used by them. If the Oracle Restart home has been backed up, and if there is a failure, then restoring the Oracle Restart home restores OCR. To remove a voting disk, run the following command, specifying one or more space-delimited, voting disk FUIDs or comma-delimited directory paths to the voting disks you want to remove: After you start CSS in exclusive mode, you can replace the voting disk, as follows: To migrate voting disks to Oracle ASM, specify the Oracle ASM disk group name in the following command: After modifying the voting disk, verify the voting disk location, as follows: Scripting on this page enhances content navigation, but does not change the content in any way. b. This allows for the FRA diskgroup to be restored at a time slightly ahead of DATA, allowing Oracle to perform additional database recovery through the application of archivelogs. 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. 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 If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. Repairing an OCR involves either adding, deleting, or replacing an OCR location. c)A node must be able to access more than half of the voting disks at any time. You can inspect a backup using the OCRDUMP utility. You can have up to five OCR locations. It is located on the shared cluster system or a shared raw device file or Oracle ASM(11gr2 onwards) . Worked as a Development and Database Administrator. 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. The written block has a header area with the node name. A failure group is a subset of the disks in a disk group. Restore Voting Disk Since we have restored OCR, we restored voting file as well. 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. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. An FRA diskgroup that holds archivelogs and backups. Oracle High Availability Services uses this information. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Our storage is EMC SAN. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Helpful tips . 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". An advanced recognition engine is needed for OCR compared to OMR. 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. Voting disk management requires a valid and working OCR. 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. 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. OCR is more commonly used than Voting Disk. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. Database data files, temp files, redo logs and undo, SYSTEM, SYSAUX, DATA, INDEX, USERS, TEMP, UNDO, Shared or database-specific ASM diskgroups, ScaleIO volumes, ASM diskgroup, and database datafile relationship, ASM stripesize, coarse, and fine grained striping, ASM intelligent data placement and physical disk placement, ASM compaction and rebalance (ASM 11.1.0.7 and later), A DATA diskgroup to hold all data, index, undo and temp files, An FRA diskgroup that holds archivelogs and backups, Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in, Using VMDKs and ASM with Virtualized Databases. Compare the node's OCR configuration (ocr.loc on Linux and UNIX systems and the Registry on Windows systems) with other nodes on which Oracle Clusterware is running. 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++. 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. 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. WebOracle 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. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. A voting disk is a file that manages information about node membership. 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. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. 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: Run the crsctl query css votedisk command to retrieve the list of voting files currently defined, similar to the following: This list may be empty if all voting disks were corrupted, or may have entries that are marked as status 3 or OFF. Voting Disk. OMR technology scans a printed form and reads from predefined positions. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface In a nutshell, OCR is used by CRSd and OLR by the OHASd. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. Hi all, What is the difference b/w OCR and Voting Disk. What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? If you configure a single voting disk, then you should use external mirroring to provide redundancy. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. --Connect with Grid User WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. Mirroring can help prevent OCR from becoming a single point of failure. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. Basic information about the resources, their location, permissions, current value, type, state, etc. List the Candidate Disk present for creating DISKGROUP. 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. For example, the database cannot be started until the asm resource has come up, or the service resource doesnt start until the database has been started. 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. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created.
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