Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; 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. Oracle Clusterware can manage up to five redundant OCR locations. 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. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. OCR is more commonly used than Voting Disk. 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. Attempt to resolve the cause of the CLSD-1009 and CLSD-1011 messages. It is the rapid method of data entry. Your email address will not be published. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. It was introduced in 11gR2, and is not shared by any other node in the cluster. 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. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. Both heartbeats failed. 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. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. My test systems OLR files has about 651 keys. 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. This section describes how to back up OCR content and use it for recovery. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. You cannot customize the backup frequencies or the number of files that Oracle Database retains. If you store OCR on an Oracle ASM disk group and the disk group is not available, then you must recover and mount the Oracle ASM disk group. --add the new diskgroup with root user. You must instead use the -restore option, as described in the following sections. If you configure a single voting disk, then you should use external mirroring to provide redundancy. Restore OCR by running the following command as root: Run the ocrcheck command to verify the integrity of OCR: Start Oracle High Availability Services by running the following command on all of the nodes: You can use the OCRDUMP and OCRCHECK utilities to diagnose OCR problems. Worked as a Development and Database Administrator. a) We must have an odd number of disks.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'techgoeasy_com-large-leaderboard-2','ezslot_13',194,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-leaderboard-2-0'); b)Oracle recommends a minimum of 3 and a maximum of 5. --With Spmove command we will move the spfile 1. 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. In addition, with numerous nodes, there are other possible scenarios too. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. I am installing two node Oracle 11gR1 RAC on Solaris. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. 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. In a nutshell, OCR is used by CRSd and OLR by the OHASd. b. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. The destination of OCR file has been replaced. You can have up to five OCR locations. An advanced recognition engine is needed for OCR compared to OMR. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. 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. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. on Oct 5 2010. 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. At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. Rely on OCR Backups Since 11g (11.2), 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. 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. WebHello Friends,Here with one more topic on database administration guide. 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. It is hard to implement as compared to OMR. 1. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. Mirroring can help prevent OCR from becoming a single point of failure. 10. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. The text to speech can be used by them. It contains key value pairs of various resources in the cluster. What are Consumer Forums and what is their importance? It records the data where marks are made on the form. 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. OCR stores Oracle Clusterware and Oracle RAC database configuration information If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. 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. 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. It shares the same layout or structure as the OCR. 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. We and our partners share information on your use of this website to help improve your experience. Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices. 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++. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. c)A node must be able to access more than half of the voting disks at any time. Important Operation for Voting disks in RACa) To list currently configured voting diskif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-mobile-banner-1','ezslot_15',198,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-mobile-banner-1-0'); Run the following command as the root user to remove a voting disk: Run the following command to back up a voting disk. As a definitive verification that OCR failed, run ocrcheck and if the command returns a failure message, then both the primary OCR and the OCR mirror have failed. In this case, it is a little more difficult because:1. Attempt to correct the problem using the OCR restoration procedure for your platform. Jump to Answer. 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. 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. on Oct 5 2010. 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Voting files. 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. It is useful in grading, calculating marks, etc. 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. Despite the fact that crsctl query css votedisk reports zero vote disks in use, Oracle Clusterware remembers the fact that Oracle ASM was in use and the replace verb is required. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. It stands for Optical Mark Reader or Optical Mark Recognition. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. If one fails it doesnt cause an outage and the failed one can be replaced. Hi all, What is the difference b/w OCR and Voting Disk. It contains the following information shared across the 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. The Oracle Clusterware has the OCR and voting disks open and is actively using them. Ensure that the file you created is visible from all nodes in the cluster. Each successive run of this command must point to a different file location. Change), You are commenting using your Facebook account. At any one time, Oracle Database always retains the last three backup copies of OCR. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. 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. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'techgoeasy_com-leader-1','ezslot_11',195,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-leader-1-0');2) In a shared storage system, we need to manually configure these files with a redundancy setup for high availability. (Both primary and mirrors) 2. Disk heartbeat is successful, but network heartbeat is missed.3. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). At least two OCR locations if OCR is configured on an Oracle ASM disk group. To change an Oracle Cluster Registry location: Use the OCRCHECK utility to verify that a copy of OCR other than the one you are going to replace is online, using the following command: OCRCHECK displays all OCR locations that are registered and whether they are available (online). 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. Run the following command to list the backup files: The ocrconfig -showbackup command displays the backup location, timestamp, and the originating node name of the backup files that Oracle Clusterware creates.
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