Ensure that the file you created is visible from all nodes in the cluster. col name for a20 Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. select path,name,header_status from v$asm_disk CRS-4266: Voting file(s) successfully replaced, 9. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. ocrdump should be executed as root to display all the keys available. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. If the original OCR location does not exist, then you must create an empty (0 byte) OCR location with appropriate permissions before you run the ocrconfig -add or ocrconfig -replace commands. Is it illegal to lie about a felony on an application? For a full experience use one of the browsers below. List the Candidate Disk present for creating DISKGROUP. 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. The text to speech can be used by them. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). Your email address will not be published. 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. This section describes how to back up OCR content and use it for recovery. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. 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. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. If a resource fails, then before attempting to restore OCR, restart the resource. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. It is hard to implement as compared to OMR. 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. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. This is true even in cases where there are no working voting disks. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. 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. 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. If this problem is local to only one node, you can use other nodes to start your cluster database. When you repair OCR on a stopped node using ocrconfig -repair, you must provide the same OCR file name (which should be case-sensitive) as the OCR file names on other nodes. Important points about Voting disks in Oracle RAC. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. 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. 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. 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. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. For example, the database cannot be started until the asm resource has come up, or the service resource doesnt start until the database has been started. An FRA diskgroup that holds archivelogs and backups. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. Hi all, What is the difference b/w OCR and Voting Disk. 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. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. Voting Disk. Check whether crsd is running. Save my name, email, and website in this browser for the next time I comment. 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. 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. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. Jump to Answer. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. -- Mount diskgroup +OCR_NEWDG/RAC-cluster/spfileASM.ora. You cannot inspect the contents of an export. on Oct 5 2010. user13389425 Sep 7 2010 edited Sep 7 2010. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; 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. Mirroring can help prevent OCR from becoming a single point of failure. Added on Sep 7 ERROR: Unable to verify the graphical display setup. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Perform the following procedure as the root user to remove an OCR location from your Oracle Clusterware environment: Ensure that at least one OCR location other than the OCR location that you are removing is online. 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. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. WebOCR and 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. Voting files The ocrconfig -export and ocrconfig -import commands are compatible. Because the default backup is on a local file system, Oracle recommends that you include the backup file created with the OCRCONFIG utility as part of your operating system backup using standard operating system or third-party tools. 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 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. Majority of the keys in the OCRDUMPFILE deal with the CRSd. Please contact us at [email protected], 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. OMR technology scans a printed form and reads from predefined positions. OCR contains information about all Oracle resources in the cluster. 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. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; You cannot directly influence the number of voting disks in one disk group. 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. 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. The location of OLR can be found in /etc/oracle/olr.loc. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. 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. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. 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. 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 the configurations do not match, run ocrconfig -repair. 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 choose to put the voting disks into an Oracle ASM disk group, then Oracle ASM ensures the configuration of multiple voting disks if you use a normal or high redundancy disk group. (Both primary and mirrors) 2. Please sign in to comment Added on Sep 7 This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. OCR is what registry is for Windows. --add the new diskgroup with root user. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. The visually impaired people find it useful. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 3. In addition, with numerous nodes, there are other possible scenarios too. 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. --Connect with Grid User This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. Move the OCR to new diskgroup. An FRA diskgroup that holds archivelogs and backups. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. There are a few different scenarios possible with missing heartbeats:1. To add an OCRMIRROR device when only OCR device is defined: 3. 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. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. 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. CREATE DISKGROUP OCR_NEWDG NORMAL REDUNDANCY Backups are created when the system is online. 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. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' Voting disks contain static and dynamic data. 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". OCR is more commonly used than Voting Disk. Oracle Clusterware can manage up to five redundant OCR locations. 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. It is useful in grading, calculating marks, etc. 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 Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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.
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