What are Consumer Forums and what is their importance? The location of OLR can be found in /etc/oracle/olr.loc. Note that the commands you use to do this are different, depending on whether your voting disks are located in Oracle ASM, or are located in another storage option. 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. If you have only one OCR location configured and online, then you must first add a new location and then delete the failed location, as follows: It may be necessary to repair OCR if your cluster configuration changes while that node is stopped and this node is the only member in the cluster. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. An advanced recognition engine is needed for OCR compared to OMR. 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. Voting disks contain static and dynamic data. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. This process is called DISK HEARTBEAT. 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. To migrate OCR from Oracle ASM to another storage type: Create a file in a shared or cluster file system with the following permissions: root, oinstall, 640. 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. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. A voting disk is a file that manages information about node membership. 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. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -add +OCR_NEWDG, --Verify the OCR is show in two diskgroup 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. At any one time, Oracle Database always retains the last three backup copies of OCR. 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. OCR Hi all, What is the difference b/w OCR and Voting Disk. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. 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. OCR stores Oracle Clusterware and Oracle RAC database configuration information user13389425 Sep 7 2010 edited Sep 7 2010. If a resource fails, then before attempting to restore OCR, restart the resource. 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. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. The Oracle installation process for Oracle Clusterware gives you the option of automatically mirroring OCR. Jump to Answer. If you must change an existing OCR location, or change a failed OCR location to a working location, then you can use the following procedure, as long as all remaining OCR locations remain online. 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. 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. 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. srvctl status diskgroup -g OCR_NEWDG 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. Ensure there is at least 280 MB of space on the mount partition. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. WebHello Friends,Here with one more topic on database administration guide. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. on Oct 5 2010. 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. Each successive run of this command must point to a different file location. 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. 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". You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. OCR is what registry is for Windows. OCR and voting disk OCR Worked as a Development and Database Administrator. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget Ocr 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. Hi, How the voting disk differ from the OCR. Comments. This section describes how to back up OCR content and use it for recovery. 4. CREATE DISKGROUP OCR_NEWDG NORMAL REDUNDANCY OCR is more commonly used than Voting Disk. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. It provides more accuracy as compared to OCR. OCR and Voting Managing Oracle Cluster Registry and Voting Disks # /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/). This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. You can inspect a backup using the OCRDUMP utility. 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. where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. Voting disk management requires a valid and working OCR. 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. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. What is voting disks in RAC You cannot directly influence the number of voting disks in one disk group. In addition, with numerous nodes, there are other possible scenarios too. Is it illegal to lie about a felony on an application? The Windows default location for generating backups uses the same path structure. 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 OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". Voting Disk Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. At least two OCR locations if OCR is configured on an Oracle ASM disk group. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. OCR and Voting Our storage is EMC SAN. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Verify the VotingDisk movement on both nodes. Check the location of OCR Disk from GRID Home with root user. "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands" to use manually created OCR export files to copy OCR content and use it for recovery. It records the data where marks are made on the form. The written block has a header area with the node name. OLR is located on local storage on each node in a cluster. 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. For Oracle Clusterware 12c, please refer to Software Patch Level and 12c Grid Infrastructure OCR Backup/Restore. OCR and Voting Disk Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE This post has been answered by user00726 on Sep 7 2010. The text to speech can be used by them. WebOCR and Voting Disk. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. How do you write a referee report for a job application? The destination of OCR file has been replaced. To add the file as an OCR location, 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 more than one OCR location. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Use the following procedure to restore OCR in an Oracle Restart environment: Stop Oracle High Availability Services by running the following command on all of the nodes: Run the ocrcheck -config command to determine the OCR location and then create an empty (0 byte) OCR location with appropriate permissions in that location. 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. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents: Run the following command to recover a voting disk where backup_file_name is the name of the voting disk backup file and voting_disk_name is the name of the active voting disk: Hope you like the information onvoting disks in RAC.