Look at output from the ocrdump command and determine whether it has your latest updates. 1. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. In a nutshell, OCR is used by CRSd and OLR by the OHASd. where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. col path for a30 WebOCR and Voting Disk. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. Oracle Cluster Registry "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. 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. Attempt to correct the problem using the OCR restoration procedure for your platform. 1. There are a few different scenarios possible with missing heartbeats:1. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. However, if you upgrade from a previous version of Oracle Clusterware, you can migrate OCR to reside on Oracle ASM, and take advantage of the improvements in managing Oracle Clusterware storage. 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 --Connect with SQLPLUS ASM instance (Both primary and mirrors) 2. 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. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. (LogOut/ Its application is in google books, bank statements, business documents etc. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. [grid@NODE01 ~]$ crsctl query css votedisk. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. The text to speech can be used by them. Move the VotingDisk to new 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. Oracle ASM manages voting disks differently from other files that it stores. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. To add an OCRMIRROR device when only OCR device is defined: 3. Break-in heartbeats indicate a possible error scenario. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. user13389425 Sep 7 2010 edited Sep 7 2010. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 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. You cannot inspect the contents of an export. 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. Use the following command to verify that Oracle Clusterware is running on the node on which the you are going to perform the replace operation: Run the following command as root to replace the current OCR location using either destination_file or +ASM_disk_group to indicate the current and target OCR locations: The preceding command fails if you have less than two configured OCR locations that are online. Hi, How the voting disk differ from the OCR. The CRSD process that creates the backups also creates and retains an OCR backup for each full day and at the end of each week. Save my name, email, and website in this browser for the next time I comment. The Oracle Clusterware has the OCR and voting disks open and is actively using them. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. OCR is more commonly used than Voting Disk. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. WebOCR and Voting Disk. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. Oracle Clusterware uses voting files to determine which nodes are members of a It contains manageability information about Oracle Clusterware, including dependencies between various services. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; Hi all, What is the difference b/w OCR and Voting Disk. 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. My test systems OLR files has about 651 keys. It was introduced in 11gR2, and is not shared by any other node in the cluster. Make sure that xdpyinfo exist under PATH variable. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. Helpful tips . If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. 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. 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. Move the SPFILE to newdiskgroup. (Both primary and mirrors)2. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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. Voting files. Oracle Cluster Registry (OCR) which records cluster configuration information. col name for a20 Only after you use the replace verb to move voting disks back to non-Oracle ASM storage are the verbs add css votedisk and delete css votedisk again usable. 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. It is used in scanning and converting different types of documents. srvctl status diskgroup -g OCR_NEWDG d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. 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. Ensure that the Oracle ASM disk group that you specify exists and is mounted. A failure group is a subset of the disks in a disk group. Backups are created when the system is online. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. 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. [grid@RAC1 ~]$ asmcmd spget Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices. Ensure that the most recent OCR contains the latest OCR updates. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface than typical cp and/or dd commands.It is highly recommended to take a backup of the voting disk, and OCR device before making any changes. Please do provide the feedback, Related ArticlesWhat is Oracle Clusterware?How to Recreate Central Inventory in Real Applications ClustersHow to add any node to Oracle RAC cluster in 10g and 11gHow to setup diag wait in clusterCluster command in Oracle clusterware 10g and 11gOracle Flex Cluster 12c, Filed Under: Oracle, Oracle Database Tagged With: voting disks, Your email address will not be published. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option. Modifying voting disks that are stored in Oracle ASM. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. Each successive run of this command must point to a different file location. 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. It contains key value pairs of various resources in the cluster. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. 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. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. OCR contains information about all Oracle resources in the cluster. 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. Repairing an OCR involves either adding, deleting, or replacing an OCR location. OCR is more commonly used than Voting Disk. An FRA diskgroup that holds archivelogs and backups. Disk Group ocr_newdg is running on node01,node02, 8. Learn how your comment data is processed. OMR technology scans a printed form and reads from predefined positions. 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. 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. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. OCR has a mechanism that prevents data loss due to accidental overwrites. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface You can inspect a backup using the OCRDUMP utility. In a nutshell, OCR is used by CRSd and OLR by the OHASd. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. Oracle High Availability Services uses this information. It does not require an advanced level recognition engine when compared to OCR. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. The ocrconfig -export and ocrconfig -import commands are compatible. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. 11gR2 can have upto five mirrored copies of OCR. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). 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. --With Spmove command we will move the spfile Voting Disk. 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". 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. 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. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. Voting files user13389425 Sep 7 2010 edited Sep 7 2010. Basic information about the resources, their location, permissions, current value, type, state, etc. For example, if you ran the ocrconfig -restore command on node 1 of a four-node cluster, then you must run the ocrconfig -repair -replace command on nodes 2, 3, and 4. +OCR_NEWDG/RAC-cluster/spfileASM.ora. FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' It stands for Optical Character Reader or Optical Character Recognition. (LogOut/ Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. 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. The two file formats are incompatible and must not be interchangeably used. It stores information about the local node only, mainly related to the OHASd (as we will see below). OCR is what registry is for Windows. 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. In a nutshell, OCR is used by CRSd and OLR by the OHASd. +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. It is used to process data from printed forms. 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