acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers. You must run the command as a user with administrative privileges. Oracle recommends that you use Oracle ASM to store OCR and voting disks. Helpful tips . For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. If you move voting disks from one Oracle ASM disk group to another, then you can change the number of voting disks by placing them in a disk group of a different redundancy level as the former disk group. Do this by using the ocrconfig -export command, which exports OCR content to a file format. +OCR_NEWDG/RAC-cluster/spfileASM.ora. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. You can find the location of the OCRFILE using one of the tow methods below. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. 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. 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. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. 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. Voting files. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' A small number of failure groups, or failure groups of uneven capacity, can create allocation problems that prevent full use of all of the available storage. OCR You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. Just one node is unhealthy. Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as root: The -nocrs option ensures that the crsd process and OCR do not start with the rest of the Oracle Clusterware stack. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. The first method uses automatically generated OCR copies and the second method enables you to issue a backup command manually: Automatic backups: Oracle Clusterware automatically creates OCR backups every four hours. (LogOut/ If you cannot mount the disk group locally, then run the following SQL*Plus command: Optionally, if you want to restore OCR to a raw device, then you must run the ocrconfig -repair -replace command as root, assuming that you have all the necessary permissions on all nodes to do so and that OCR was not previously on Oracle ASM. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Ensure that the Oracle ASM disk group you specify exists and is mounted. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. In addition to using the automatically created OCR backup files, you should also export OCR contents before and after making significant configuration changes, such as adding or deleting nodes from your environment, modifying Oracle Clusterware resources, and upgrading, downgrading or creating a database. Voting Disk. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. 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. Voting Disk. Move the SPFILE to newdiskgroup. 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. difference between OCR and voting disk ERROR: Unable to verify the graphical display setup. It contains the following information shared across the nodes in the cluster. WebHello Friends,Here with one more topic on database administration guide. Attempt to correct the problem using the OCR restoration procedure for your platform. OCR stores Oracle Clusterware and Oracle RAC database configuration information 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++. The Oracle Clusterware has the OCR and voting disks open and is actively using them. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status Oracle ASM on ScaleIO Best Practices - Dell Technologies This is true even in cases where there are no working voting disks. 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. 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. Note: In Shared storage you should create 3 minimum voting files in separate storage. 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. srvctl status diskgroup -g OCR_NEWDG For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. A failure group is a subset of the disks in a disk group. 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. Jump to Answer. 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. user13389425 Sep 7 2010 edited Sep 7 2010. You can just replace with new voting file on disk group DATA. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. on Oct 5 2010. 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. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. OCR is more commonly used than Voting Disk. 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. OCR and voting disk OCR contains information about all Oracle resources in the cluster. 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. Our storage is EMC SAN. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. 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. Save my name, email, and website in this browser for the next time I comment. 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. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Run the following command on any node in the cluster to remove an OCR location from either Oracle ASM or other location: The file_name variable can be a device name or a file name. 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. 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. voting disk 2. The OLR only supports manual backups. 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). Oracle Clusterware uses voting files to determine which nodes are members of a Oracle 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. Hi, How the voting disk differ from the OCR. Oracle ASM manages voting disks differently from other files that it stores. Hi, How the voting disk differ from the OCR. 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. --add the new diskgroup with root user. By using our site, you To improve Oracle Clusterware storage manageability, OCR is configured, by default, to use Oracle ASM in Oracle Database 11g release 2 (11.2). If you upgrade from a previous version of Oracle Clusterware to Oracle Clusterware 11g release 2 (11.2) and you want to store voting disks in an Oracle ASM disk group, then you must set the ASM Compatibility (COMPATIBLE.ASM) compatibility attribute to 11.2.0.0. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. 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. b. 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. 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. 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. where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. Required fields are marked *. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. 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. It contains key value pairs of various resources in the cluster. The destination of OCR file has been replaced. Verify the VotingDisk movement on both nodes. OCR stores configuration information in a series of key-value pairs in a tree structure. 1. You cannot customize the backup frequencies or the number of files that Oracle Database retains. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. There are a few different scenarios possible with missing heartbeats:1. This means that a device must exist. 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. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. Typically this is the work area and the recovery area. Difference between If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. --Connect with SQLPLUS ASM instance 1. If one fails it doesnt cause an outage and the failed one can be replaced. When exporting OCR, Oracle recommends including "ocr", the cluster 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. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. 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. 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. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. What is voting disks in RAC 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. How do you write a referee report for a job application? A high redundancy disk group must contain at least three failure groups. You cannot directly influence the number of voting disks in one disk group. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; I am installing two node Oracle 11gR1 RAC on Solaris. Oracle High Availability Services uses this information. the OCR, VotingDisk and spfile to new Database data files, temp files, redo logs and undo, SYSTEM, SYSAUX, DATA, INDEX, USERS, TEMP, UNDO, Shared or database-specific ASM diskgroups, ScaleIO volumes, ASM diskgroup, and database datafile relationship, ASM stripesize, coarse, and fine grained striping, ASM intelligent data placement and physical disk placement, ASM compaction and rebalance (ASM 11.1.0.7 and later), A DATA diskgroup to hold all data, index, undo and temp files, An FRA diskgroup that holds archivelogs and backups, Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in, Using VMDKs and ASM with Virtualized Databases. 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. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget It is used in scanning and converting different types of documents. The location of OLR can be found in /etc/oracle/olr.loc. Mirroring can help prevent OCR from becoming a single point of failure. 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. Your biggest Honkai: Star Rail questions, answered Comments. It is the rapid method of data entry. 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. to Restore OCR and Voting Disk Static data: Info about nodes in the cluster. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. The written block has a header area with the node name. To add an OCRMIRROR device when only OCR device is defined: 3. 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. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. (Both primary and mirrors)2. It stands for Optical Mark Reader or Optical Mark Recognition. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. Worked as a Development and Database Administrator. I am installing two node Oracle 11gR1 RAC on Solaris. OLR is located on local storage on each node in a cluster. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. to Backup OCR and Voting Disk Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). 1. Managing Oracle Cluster Registry and Voting Disks Cluster management is now affected on this particular node. It was introduced in 11gR2, and is not shared by any other node in the cluster. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. It does not require an advanced level recognition engine when compared to OCR. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. It records the data where marks are made on the form. Generally, the following information is found in the OLR. 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 In this case, a message to this effect is written in the KILL BLOCK of the node. 3. OCR and Voting Disk This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. Oracle Clusterware can manage up to five redundant OCR locations. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_4',129,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_5',129,'0','1'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_1');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_6',129,'0','2'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_2');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_7',129,'0','3'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_3');.large-billboard-2-multi-129{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:2px!important;margin-left:auto!important;margin-right:auto!important;margin-top:2px!important;max-width:100%!important;min-height:250px;min-width:300px;padding:0;text-align:center!important}, Enter your email address to subscribe to this blog and receive notifications of new posts by email. It is useful in grading, calculating marks, etc.
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