It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. However, each successive run must point to a different disk group. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. 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. The main difference between OCR and Voting Disk is that OCR is used to convert scanned images of text into digital text, while Voting Disk is used to store the ballot information for an election. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. 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. 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++. Mount and check status Diskgroup in all Nodes In addition, with numerous nodes, there are other possible scenarios too. Oracle Cluster Registry It shares the same layout or structure as the OCR. 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 -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. OCR If you choose to store your voting disks in Oracle ASM, then Oracle ASM stores all the voting disks for the cluster in the disk group you choose. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. 1. OCR and voting disk The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. OCR is more commonly used than Voting Disk. Recover the Oracle voting disk when its Break-in heartbeats indicate a possible error scenario. Its application is in google books, bank statements, business documents etc. By using our site, you 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. c)A node must be able to access more than half of the voting disks at any time. It contains manageability information about Oracle Clusterware, including dependencies between various services. It stores information about the local node only, mainly related to the OHASd (as we will see below). 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. Check whether crsd is running. An advanced recognition engine is needed for OCR compared to OMR. 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. +OCR_NEWDG/RAC-cluster/spfileASM.ora. Ocr You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. Worked as a Development and Database Administrator. Oracle Cluster Registry (OCR) which records cluster configuration information. It records the data where marks are made on the form. It was introduced in 11gR2, and is not shared by any other node in the cluster. to Backup OCR and Voting Disk Just one node is unhealthy. WebOCR and Voting Disk. 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. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. Comments. Basic information about the resources, their location, permissions, current value, type, state, etc. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. (LogOut/ 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. Helpful tips . Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. In a nutshell, OCR is used by CRSd and OLR by the OHASd. Hi all, What is the difference b/w OCR and Voting Disk. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. Oracle ASM on ScaleIO Best Practices - Dell Technologies Change). Nytro.ai uses technology that works best in other browsers. OCR has a mechanism that prevents data loss due to accidental overwrites. 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. You can just replace with new voting file on disk group DATA. difference between OCR and voting disk Disk Group ocr_newdg is running on node01,node02, 8. 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. Look at output from the ocrdump command and determine whether it has your latest updates. What is voting disks in RAC [grid@RAC1 ~]$ asmcmd spget Ensure there is at least 280 MB of space on the mount partition. Check the SPFILE location. It stands for Optical Mark Reader or Optical Mark Recognition. CSS service is sending heartbeat messages through the network and voting disk.In a situation, when due to private network failure, nodes are not able to synchronize I/O to the shared disks, Therefore some of the nodes will be going to the offline stage. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Modifying voting disks that are stored in Oracle ASM. Voting Disk, should it be OCR and Voting Disk Check the location of OCR Disk from GRID Home with root user. Is it illegal to lie about a felony on an application? 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. It contains the following information shared across the nodes in the cluster. user13389425 Sep 7 2010 edited Sep 7 2010. Restore Voting Disk Since we have restored OCR, we restored voting file as well. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status Ensure that the Oracle ASM disk group that you specify exists and is mounted. What is voting disks in RAC If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. These backups are stored for a week and written in a round-robin fashion. A voting disk is a file that manages information about node membership. Please sign in to comment 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. Change), You are commenting using your Facebook account. OCR +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. Oracle High Availability Services uses this information. 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. Mirroring can help prevent OCR from becoming a single point of failure. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. (Both primary and mirrors) 2. You should configure OCR in two independent disk groups. srvctl status diskgroup -g OCR_NEWDG to Backup OCR and Voting Disk Disk heartbeat is successful, but network heartbeat is missed.3. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. 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. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. 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. 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. Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option. CRS-4266: Voting file(s) successfully replaced, 9. Note: After verfied on all nodes then move to OCR Disks. Please sign in to comment 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. Oracle Clusterware can manage up to five redundant OCR locations. 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 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. If one fails it doesnt cause an outage and the failed one can be replaced. user13389425 Sep 7 2010 edited Sep 7 2010. Added on Sep 7 The text to speech can be used by them. Hi all, What is the difference b/w OCR and Voting Disk. An FRA diskgroup that holds archivelogs and backups. to Restore OCR and Voting Disk voting disk Generally, the following information is found in the OLR. cluster. c)A node must be able to access more than half of the voting disks at any time. Network heartbeat is successful, but disk heartbeat is missed.2. "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. 10. OMR technology scans a printed form and reads from predefined positions. (LogOut/ [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG 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. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. c)A node must be able to access more than half of the voting disks at any time. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. Find the temp usage by sessions in Oracle. 1. 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 records the data where marks are made on the form. What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. 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. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. Restoring the Oracle Cluster Registry on Linux or UNIX Systems, Restoring the Oracle Cluster Registry on Windows Systems, Restoring the Oracle Cluster Registry in an Oracle Restart Environment. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget At any one time, Oracle Database always retains the last three backup copies of OCR. 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