For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Oracle Local Registry is OCRs local counterpart. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. This is true even in cases where there are no working voting disks. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). The Oracle installation process for Oracle Clusterware gives you the option of automatically mirroring OCR. Hi, How the voting disk differ from the OCR. 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. 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 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 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. 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. Helpful tips . You can find the location of the OCRFILE using one of the tow methods below. Our storage is EMC SAN. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. Check the Voting Disk Location Ensure there is at least 280 MB of space on the mount partition. Change). A high redundancy disk group must contain at least three failure groups. This post has been answered by user00726 on Sep 7 2010. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. 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. Voting Disk. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. Please sign in to comment 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. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. 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. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. "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. CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. 1. To improve Oracle Clusterware storage manageability, OCR is configured, by default, to use Oracle ASM in Oracle Database 11g release 2 (11.2). The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. Repairing an OCR involves either adding, deleting, or replacing an OCR location. 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. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. Verify the VotingDisk movement on both nodes. Configure voting files on Oracle ASM or on shared storage. 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. ERROR: Unable to verify the graphical display setup. Note: After verfied on all nodes then move to OCR Disks. WebHello Friends,Here with one more topic on database administration guide. 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. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. It records the data where marks are made on the form. Generally, the following information is found in the OLR. The Oracle Clusterware has the OCR and voting disks open and is actively using them. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. If you configure a single voting disk, then you should use external mirroring to provide redundancy. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. Comments. Break-in heartbeat indicates a possible error scenario. It is used in scanning and converting different types of documents. col header_status for a20 In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. Oracle Cluster Registry (OCR) which records cluster configuration information. 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 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. For any work, queries and help. Restoring the Oracle Cluster Registry on Linux or UNIX Systems, Restoring the Oracle Cluster Registry on Windows Systems, Restoring the Oracle Cluster Registry in an Oracle Restart Environment. It records the data where marks are made on the form. Begin to start Oracle Clusterware by running the following command as root on all of the nodes: Verify OCR integrity of all of the cluster nodes that are configured as part of your cluster by running the following CVU command: Use the following procedure to restore OCR on Windows systems: Stop Oracle Clusterware by running the following command as a member of the Administrators group 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 a member of the Administrators group on all of the nodes: Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as a member of the Administrators group: Restore OCR with the OCR backup file that you identified in "Listing Backup Files" by running the following command as a member of the Administrators group: Make sure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. 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. As a definitive verification that OCR failed, run ocrcheck and if the command returns a failure message, then both the primary OCR and the OCR mirror have failed. OLR is located on local storage on each node in a cluster. Find the temp usage by sessions in Oracle. The visually impaired people find it useful. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. This section describes how to back up OCR content and use it for recovery. OCR is what registry is for Windows. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. 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. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. If the configurations do not match, run ocrconfig -repair. The Oracle Clusterware has the OCR and voting disks open and is actively using them. Oracle Cluster Registry The ocrconfig -export and ocrconfig -import commands are compatible. The destination of OCR file has been replaced. You can run this command more than once if there is more than one OCR location configured. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. Nytro.ai uses technology that works best in other browsers. 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. Added on Sep 7 A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. This section describes how to administer OCR in the following topics: Migrating Oracle Cluster Registry to Oracle Automatic Storage Management, Adding, Replacing, Repairing, and Removing Oracle Cluster Registry Locations, Diagnosing Oracle Cluster Registry Problems, Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands, Upgrading and Downgrading the Oracle Cluster Registry Configuration. Check the location of OCR Disk from GRID Home with root user. It contains manageability information about Oracle Clusterware, including dependencies between various services. 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. OMR technology scans a printed form and reads from predefined positions. If OCR is stored in an Oracle ASM disk group with external redundancy, then Oracle recommends that you add another OCR location to another disk group to avoid the loss of OCR, if a disk fails in the disk group. This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. Break-in heartbeats indicate a possible error scenario. OCR is more commonly used than Voting Disk. When using a mix of storage pools with both high capacity spinning disks and high performance solid state devices additional diskgroups should be considered, which correspond to the different performance storage pools. 10. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. Restore Voting Disk Since we have restored OCR, we restored voting file as well. Jump to Answer. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". c)A node must be able to access more than half of the voting disks at any time. 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. Oracle Clusterware uses voting files to determine which nodes are members of a [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. It was introduced in 11gR2, and is not shared by any other node in the cluster. Voting files. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. 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. c)A node must be able to access more than half of the voting disks at any time. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). In a nutshell, OCR is used by CRSd and OLR by the OHASd. You cannot use the crsctl add | delete votedisk commands on voting disks stored in Oracle ASM disk groups because Oracle ASM manages the number of voting disks according to the redundancy level of the disk group. 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. (Both primary and mirrors) 2. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. How do you write a referee report for a job application? 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. By default, the -showbackup option displays information for both automatic and manual backups but you can include the auto or manual flag to display only the automatic backup information or only the manual backup information, respectively. This post has been answered by user00726 on Sep 7 2010. Move the SPFILE to newdiskgroup. 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. 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.
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