difference between ocr and voting disk
Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. 2. 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. Added on Sep 7 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. If the configurations do not match, run ocrconfig -repair. 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". 1. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 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". Restore OCR with an OCR backup that you can identify in "Listing Backup Files" by running the following command as root: If you configured OCR in an Oracle ASM disk group, then ensure that the Oracle ASM disk group exists and is mounted. It is located on the shared cluster system or a shared raw device file or Oracle ASM(11gr2 onwards) . If you must change an existing OCR location, or change a failed OCR location to a working location, then you can use the following procedure, as long as all remaining OCR locations remain online. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. The default location for generating backups on Linux or UNIX systems is Grid_home/cdata/cluster_name, where cluster_name is the name of your cluster. We and our partners share information on your use of this website to help improve your experience. 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. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. There are a few different scenarios possible with missing heartbeats:1. Note: After verfied on all nodes then move to OCR Disks. Ensure that the file you created is visible from all nodes in the cluster. 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. Look at output from the ocrdump command and determine whether it has your latest updates. It was first used in 1914 to help blind people in reading. 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. 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. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; To improve Oracle Clusterware storage manageability, OCR is configured, by default, to use Oracle ASM in Oracle Database 11g release 2 (11.2). col header_status for a20 on Oct 5 2010. 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 (LogOut/ It maintains and consists of important details about the cluster nodes membership, such as which node is part of the cluster, who (node) is joining the cluster, and who (node) is leaving the cluster. Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices. OCR is more commonly used than Voting Disk. This is called NETWORK HEARTBEAT. Both heartbeats failed. --With Spmove command we will move the spfile If you have only one OCR location configured and online, then you must first add a new location and then delete the failed location, as follows: It may be necessary to repair OCR if your cluster configuration changes while that node is stopped and this node is the only member in the cluster. My test systems OLR files has about 651 keys. Network heartbeat is successful, but disk heartbeat is missed.2. ERROR: Unable to verify the graphical display setup. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget 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. You can have up to five OCR locations. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. A voting disk is a file that manages information about node membership. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. It stands for Optical Mark Reader or Optical Mark Recognition. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. -- Mount diskgroup For DBAs planning to use ScaleIO snapshots, a two-diskgroup solution should be considered the minimum, but control files and redo logs should NOT be mirrored to both diskgroups. 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. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). --Connect with SQLPLUS ASM instance Voting Disk. Depending on where you store your voting files, do one of the following: If the voting disks are stored in Oracle ASM, then run the following command to migrate the voting disks to the Oracle ASM disk group you specify: The Oracle ASM disk group to which you migrate the voting files must exist in Oracle ASM. OMR technology scans a printed form and reads from predefined positions. 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. (Both primary and mirrors) 2. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. --Connect with Grid User For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. 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. OCR stores Oracle Clusterware and Oracle RAC database configuration information +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. The ocrconfig -replace command requires that at least two OCR locations are configured. WebThe voting disk is a file that manages information about node membership, and the OCR is a file that manages cluster and Oracle RAC database configuration information. If voting disks are stored on Oracle ASM with normal or high redundancy, and the storage hardware in one failure group suffers a failure, then if there is another disk available in a disk group in an unaffected failure group, Oracle ASM recovers the voting disk in the unaffected failure group. 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. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. You cannot customize the backup frequencies or the number of files that Oracle Database retains. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. WebThe voting disk is a file that manages information about node membership, and the OCR is a file that manages cluster and Oracle RAC database configuration information. To add OCR to an Oracle ASM disk group, 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 multiple OCR locations. Hi, How the voting disk differ from the OCR. 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. The destination of OCR file has been replaced. 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. 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. Note: In Shared storage you should create 3 minimum voting files in separate storage. 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. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. 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. 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. What are Consumer Forums and what is their importance? Disk heartbeat is successful, but network heartbeat is missed.3. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. It is widely used as a form of data entry from printed paper data records into electronic editable text which can be easily searched, stored etc. The OLR only supports manual backups. 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. CRS-4266: Voting file(s) successfully replaced, 9. WebOracle RAC uses two storage locations, which can be accessed by all cluster members: The Oracle Cluster Registry (OCR) Contains information for managing the cluster The Voting Disk Contains information to determine which nodes are active members of the cluster at any given moment In Oracle RAC 10gRelease 2, these storage locations can 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. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. It is useful in grading, calculating marks, etc. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. WebOracle RAC uses two storage locations, which can be accessed by all cluster members: The Oracle Cluster Registry (OCR) Contains information for managing the cluster The Voting Disk Contains information to determine which nodes are active members of the cluster at any given moment In Oracle RAC 10gRelease 2, these storage locations can Majority of the keys in the OCRDUMPFILE deal with the CRSd. You can just replace with new voting file on disk group DATA. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. b. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. Save my name, email, and website in this browser for the next time I comment. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Once an OCR location is created, it does not get updated in the Oracle Restart environment. srvctl status diskgroup -g OCR_NEWDG Is it illegal to lie about a felony on an application? Voting disks contain static and dynamic data. WebOCR and Voting Disk. Required fields are marked *. Use the procedure in this section to add an OCR location. 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. OCR is what registry is for Windows. c)A node must be able to access more than half of the voting disks at any time. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. 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. This process is called DISK HEARTBEAT. Please sign in to comment OLR is located on local storage on each node in a cluster. 3. Jump to Answer. 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. OCR stores configuration information in a series of key-value pairs in a tree structure. The two file formats are incompatible and must not be interchangeably used. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Restore Voting Disk Since we have restored OCR, we restored voting file as well. 3. Hi all, What is the difference b/w OCR and Voting Disk. 4. 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. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. 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. 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. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. Remove an OCR location if, for example, your system experiences a performance degradation due to OCR processing or if you transfer your OCR to RAID storage devices and choose to no longer use multiple OCR locations, as described in the "Removing an Oracle Cluster Registry Location" section. 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. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. Cluster management is now affected on this particular node. Please sign in to comment It records the data where marks are made on the form. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. In this case, a message to this effect is written in the KILL BLOCK of the node. ocrdump should be executed as root to display all the keys available. (Both primary and mirrors) 2. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. 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. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. Static data: Info about nodes in the cluster. OCR stores configuration information in a series of key-value pairs in a tree structure. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. To restore an OCR when clusterware is down. 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.
