It was first used in 1914 to help blind people in reading. WebOCR and Voting Disk. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. To improve Oracle Clusterware storage manageability, OCR is configured, by default, to use Oracle ASM in Oracle Database 11g release 2 (11.2). 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. Look at output from the ocrdump command and determine whether it has your latest updates. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. 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. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Check the Voting Disk Location 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. Oracle Cluster Registry RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. Verify the VotingDisk movement on both nodes. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the 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. 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. The Windows default location for generating backups uses the same path structure. FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' 1. voting disk In this case, a message to this effect is written in the KILL BLOCK of the node. Ensure that the file you created is visible from all nodes in the cluster. I am installing two node Oracle 11gR1 RAC on Solaris. c)A node must be able to access more than half of the voting disks at any time. You must run the command as a user with administrative privileges. 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. Managing Oracle Cluster Registry and Voting Disks At any one time, Oracle Database always retains the last three backup copies of OCR. In addition, with numerous nodes, there are other possible scenarios too. This post has been answered by user00726 on Sep 7 2010. 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. OMR technology scans a printed form and reads from predefined positions. Please contact us at contactus@smarttechways.com, How to get DDL of Tablespace present in OracleDatabase, Follow Smart way of Technology on WordPress.com, Exclude/Include option in EXPDP and IMPDP Datapump, Create & grant permission to directory in Oracle, Check the Undo tablespace Usage in Oracle, Check datafiles and tablespace information in Oracle, Check the Patch Applied to the Oracle Database, Stop the EXPDP/IMPDP Datapump Job in Oracle, Find top CPU Consuming Session or SQLs query in Oracle. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. You can just replace with new voting file on disk group DATA. In addition to maintaining its own disk block, CSSD processes also monitor the disk block maintained by the CSSD processes of other nodes in the cluster. Oracle recommends that you use either automatic or manual backups, and the ocrconfig -restore command instead of the ocrconfig -export and ocrconfig -import commands to restore OCR for the following reasons: A backup is a consistent snapshot of OCR, whereas an export is not. (Both primary and mirrors)2. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. Its application is in google books, bank statements, business documents etc. 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. OCR Oracle Cluster Registry (OCR) which records cluster configuration information. 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. 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. OCR stores configuration information in a series of key-value pairs in a tree structure. OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. It is the rapid method of data entry. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/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. srvctl status diskgroup -g OCR_NEWDG user13389425 Sep 7 2010 edited Sep 7 2010. Voting disks contain static and dynamic data. Its primary purpose is to help in a situation where the private network communication fails.CSS (Cluster Synchronization Service) is the service that determines which nodes in the cluster are available via communication through a dedicated private network and with a voting disk used as a secondary communication mechanism. The OLR only supports manual backups. OCR is more commonly used than Voting Disk. 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. Your email address will not be published. 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. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. Our storage is EMC SAN. Both heartbeats failed. 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. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. 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. 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The written block has a header area with the node name. +OCR_NEWDG/RAC-cluster/spfileASM.ora. 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. 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. This is true even in cases where there are no working voting disks. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status You cannot customize the backup frequencies or the number of files that Oracle Database retains. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. It is used in scanning and converting different types of documents. 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. What is voting disks in RAC Modifying voting disks that are stored in Oracle ASM. 1. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. Do this by using the ocrconfig -export command, which exports OCR content to a file format. For a full experience use one of the browsers below. Once an OCR location is created, it does not get updated in the Oracle Restart environment. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. the OCR, VotingDisk and spfile to new A normal redundancy disk group must contain at least two failure groups but if you are storing your voting disks on Oracle ASM, then a normal redundancy disk group must contain at least three failure groups. To replace or move the location of an OCR device, 4. 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. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. It was introduced in 11gR2, and is not shared by any other node in the cluster. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices. 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. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 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. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Typically this is the work area and the recovery area. Mirroring can help prevent OCR from becoming a single point of failure. Check whether crsd is running. 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. 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. You must instead use the -restore option, as described in the following sections. This process is called DISK HEARTBEAT. With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. It shares the same layout or structure as the OCR. If you scroll through the key names below you will observe that most of the information pertains to the local resources required by OHASd (refer to the flow chart in the earlier post to see which values this file would hold). If the original OCR location does not exist, then you must create an empty (0 byte) OCR location before you run the ocrconfig -import 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. Ensure that the Oracle ASM disk group you specify exists and is mounted. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. 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. The destination of OCR file has been replaced. 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. It is used to process data from printed forms. Attempt to resolve the cause of the CLSD-1009 and CLSD-1011 messages. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. Break-in heartbeats indicate a possible error scenario. difference between OCR and voting disk By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; (Both primary and mirrors) 2. 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. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. OMR technology scans a printed form and reads from predefined positions. Voting files which record node membership information. This section describes how to back up OCR content and use it for recovery. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup It records the data where marks are made on the form. It provides more accuracy as compared to OCR. Oracle High Availability Services uses this information. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. Majority of the keys in the OCRDUMPFILE deal with the CRSd. Ocr 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. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. 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. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. 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.

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