This means that a device must exist. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. 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++. It records the data where marks are made on the form. Your email address will not be published. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. 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. OCR and Voting 3. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. 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. If this problem is local to only one node, you can use other nodes to start your cluster database. 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. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. You should configure OCR in two independent disk groups. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. Learn how your comment data is processed. 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. Its application is in google books, bank statements, business documents etc. Worked as a Development and Database Administrator. 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. OCR and Voting Disk The OLR only supports manual backups. 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. At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. Hi, How the voting disk differ from the OCR. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. 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. To remove a voting disk, run the following command, specifying one or more space-delimited, voting disk FUIDs or comma-delimited directory paths to the voting disks you want to remove: After you start CSS in exclusive mode, you can replace the voting disk, as follows: To migrate voting disks to Oracle ASM, specify the Oracle ASM disk group name in the following command: After modifying the voting disk, verify the voting disk location, as follows: Scripting on this page enhances content navigation, but does not change the content in any way. CRS-4266: Voting file(s) successfully replaced, 9. 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. 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. You cannot inspect the contents of an export. Oracle Clusterware can manage up to five redundant OCR locations. (LogOut/ WebOCR and Voting Disk. 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. It does not require an advanced level recognition engine when compared to OCR. What is voting disks in RAC 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. OCR and Voting Disk How do you write a referee report for a job application? For example, if the OCR location is /dev/sde1, then use the command syntax ocrconfig -repair -add /dev/sde1 on this node to repair OCR on that node. If you did not store voting disks in Oracle ASM, then run the following command using the File Universal Identifier (FUID) obtained in the previous step: Stop the Oracle Clusterware stack as root: Restart the Oracle Clusterware stack in normal mode as root: You can add, remove, and migrate voting disks after you install Oracle Clusterware. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. 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. It contains the following information shared across the nodes in the cluster. OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. Oracle Clusterware uses voting files to determine which nodes are members of a The procedure described in the following list enables you to start the cluster using the available OCR location. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. Generally, the following information is found in the OLR. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. on Oct 5 2010. OCR stores configuration information in a series of key-value pairs in a tree structure. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC. b. Ensure that the Oracle ASM disk group you specify exists and is mounted. If it is, then stop it by running the following command as root: If you want to restore OCR to an Oracle ASM disk group, then you must first create a disk group using SQL*Plus that has the same name as the disk group you want to restore and mount it on the local node. Voting Disk. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. You can run this command more than once if there is more than one OCR location configured. [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG 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. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. 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. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. 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 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 (OCR) which records cluster configuration information. 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. Its default location is in the path Grid_home/cdata/host_name.olr, where Grid_home is the Oracle Grid Infrastructure home, and host_name is the host name of the node. --With Spmove command we will move the spfile Use the following procedure to import OCR on Linux or UNIX systems: Check whether crsd is running. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the cluster resources. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. 1. What is voting disks in RAC [grid@RAC1 ~]$ asmcmd spget 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. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. 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. Note: In Shared storage you should create 3 minimum voting files in separate storage. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'techgoeasy_com-box-4','ezslot_3',192,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-box-4-0');1)If it is stored in ASM, no need to configure manually as the files will be created depending on the redundancy in ASM. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. This post has been answered by user00726 on Sep 7 2010. The goal of this note is to provide steps to add, remove, replace or move an Oracle Cluster Repository (OCR) and/or Voting Disk in Oracle Clusterware 10gR2, 11gR1 and 11gR2 environment. 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. 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. It stores information about the local node only, mainly related to the OHASd (as we will see below). 10. Oracle Grid Infrastructure Installation Guide for information about creating OCRs, Oracle Automatic Storage Management Administrator's Guide for more information about Oracle ASM disk group management. 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 Note: After verfied on all nodes then move to OCR Disks. WebHello Friends,Here with one more topic on database administration guide. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. on Oct 5 2010. You must run the command as a user with administrative privileges. # /u01/app/11.2.0.4/grid/bin/ocrdump OCRDUMPFILE.root, # /u01/app/11.2.0.4/grid/bin/ocrdump -xml OCRDUMPFILE.root.xml, # /u01/app/11.2.0.4/grid/bin/ocrdump -xml -local OLRDUMPFILE.root.xml, # grep '' OLRDUMPFILE.root.xml|wc -l, # ls -trl /u01/app/11.2.0.4/grid/cdata/ol6-dr-114-rac1.olr, Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR), 12c: Backup NOARCHIVELOG database using RMAN, Howto: Apply July PSU 12c Grid and DB to an Oracle 12c 2 Node RAC cluster, Howto: Apply 12c Grid and DB PSU to Oracle 12c 2 node RAC, AIX RM PARAMETER LIST IS TOO LONG 0403 027 KSH, RMAN TSM TDPO TIVOLI BACKUP RECOVERY ORACLE, SQL OPTIMIZATION INDEX LIKE OPERATOR EXPLAIN PLAN, ASM diskgroups, volumes, filesystems, and instances, Its own backups (/etc/oracle/ocr.loc and local backups in $ORA_CRS_HOME/cdata/). List the Candidate Disk present for creating DISKGROUP. 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. The location of OLR can be found in /etc/oracle/olr.loc. 1. A voting disk is a file that manages information about node membership. 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. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. You can check the status of OLR on the local node using the OCRCHECK utility, as follows: You can display the content of OLR on the local node to the text terminal that initiated the program using the OCRDUMP utility, as follows: You can perform administrative tasks on OLR on the local node using the OCRCONFIG utility. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Managing Oracle Cluster Registry and Voting Disks To add a new disk and remove the existing disk, run the following command, replacing the path_to_voting_diskB variable with the fully qualified path name of voting disk B: The -purge option deletes existing voting disks. Use ASMCA to create an Oracle ASM disk group that is at least the same size of the existing OCR and has at least normal redundancy. It records the data where marks are made on the form. 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. 3. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. 1. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. This section describes how to back up OCR content and use it for recovery. 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. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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. Basic information about the resources, their location, permissions, current value, type, state, etc. Oracle Cluster Registry Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. 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. OCR stores configuration information in a series of key-value pairs in a tree structure. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. Oracle 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 disks.
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