It was first used in 1914 to help blind people in reading. At least two OCR locations if OCR is configured on an Oracle ASM disk group. At any one time, Oracle Database always retains the last three backup copies of OCR. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). Look at output from the ocrdump command and determine whether it has your latest updates. 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. 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. Ensure there is at least 280 MB of space on the mount partition. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. It stands for Optical Mark Reader or Optical Mark Recognition. Attempt to correct the problem using the OCR restoration procedure for your platform. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Oracle Local Registry is OCRs local counterpart. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. 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. 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. srvctl status diskgroup -g OCR_NEWDG Few possible scenarios:1. 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. cluster. It shares the same layout or structure as the OCR. If a resource fails, then before attempting to restore OCR, restart the resource. Multiple processes on each node have simultaneous read and write access to the OLR particular to the node on which they reside, regardless of whether Oracle Clusterware is running or fully functional. 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. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. 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 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. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. These files can be stored either in ASM or in shared storage. Configure voting files on Oracle ASM or on shared storage. 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. +OCR_NEWDG/RAC-cluster/spfileASM.ora. Voting files which record node membership information. 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". Rely on OCR Backups Since 11g (11.2), the voting disk data is automatically backed up in OCR as part of any configuration change and is automatically restored to any voting disk added. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. CRS-4266: Voting file(s) successfully replaced, 9. A high redundancy disk group must contain at least three failure groups. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -add +OCR_NEWDG, --Verify the OCR is show in two diskgroup In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. Do this by using the ocrconfig -export command, which exports OCR content to a file format. 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. The OLR and GPnP profile are required to start the HA service stack. 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. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. Worked as a Development and Database Administrator. Restore Voting Disk Since we have restored OCR, we restored voting file as well. OCR stores configuration information in a series of key-value pairs in a tree structure. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. ERROR: Unable to verify the graphical display setup. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. If all voting disks are corrupted, however, you can restore them as described in "Restoring 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. Ensure that the file you created is visible from all nodes in the cluster. OCR is more commonly used than Voting Disk. 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. --With Spmove command we will move the spfile Jump to Answer. 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. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. Voting files. This step is necessary only if OCR is also corrupted or otherwise unavailable, such as if OCR is on Oracle ASM and the disk group is no longer available. It does not require an advanced level recognition engine when compared to OCR. 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. To add OCR to an Oracle ASM disk group, ensure that the Oracle Clusterware stack is running and run the following command as root: You can run this command more than once if you add multiple OCR locations. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. 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. col path for a30 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. 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. 1. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. 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. OCR has a mechanism that prevents data loss due to accidental overwrites. Your email address will not be published. Remove an OCR location if, for example, your system experiences a performance degradation due to OCR processing or if you transfer your OCR to RAID storage devices and choose to no longer use multiple OCR locations, as described in the "Removing an Oracle Cluster Registry Location" section. OCR stores configuration information in a series of key-value pairs in a tree structure. To add an OCRMIRROR device when only OCR device is defined: 3. 1. Move the SPFILE to newdiskgroup. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. 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. --Connect with Grid User An FRA diskgroup that holds archivelogs and backups. What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? It records the data where marks are made on the form. However, each successive run must point to a different disk group. 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. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. The written block has a header area with the node name. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. Static data: Info about nodes in the cluster. You must run the command as a user with administrative privileges. Basic information about the resources, their location, permissions, current value, type, state, etc. Modifying voting disks that are stored in Oracle ASM. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface What are Consumer Forums and what is their importance? You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. 10. Comments. Hi, How the voting disk differ from the OCR. I am installing two node Oracle 11gR1 RAC on Solaris. 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. The text to speech can be used by them. The ocrconfig -export and ocrconfig -import commands are compatible. If one fails it doesnt cause an outage and the failed one can be replaced. The Windows default location for generating backups uses the same path structure. Move the OCR to new diskgroup. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. Network heartbeat is successful, but disk heartbeat is missed.2. 4. OCR stores Oracle Clusterware and Oracle RAC database configuration information Ensure that the Oracle ASM disk group that you specify exists and is mounted. 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. 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. 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. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. The voting disk data is automatically backed up in OCR as part of any configuration change and is automatically restored to any voting disk added. Note: In Shared storage you should create 3 minimum voting files in separate storage. By using our site, you Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Verify the VotingDisk movement on both nodes. 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 However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. --add the new diskgroup with root user. col name for a20 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. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. It is useful in grading, calculating marks, etc. (Both primary and mirrors) 2. Helpful tips . Oracle Automatic Storage Management Administrator's Guide, Oracle Grid Infrastructure Installation Guide, "Troubleshooting Oracle Cluster Registry", "Adding an Oracle Cluster Registry Location", "Replacing an Oracle Cluster Registry Location", "Repairing an Oracle Cluster Registry Configuration on a Local Node", "Removing an Oracle Cluster Registry Location", Appendix G, "Oracle Cluster Registry Utility Reference", "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands", Appendix A, "Cluster Verification Utility Reference", "Adding, Deleting, or Migrating Voting Disks".

Chris Stapleton Tour 2022 Opening Act, Articles D