It is located on the shared cluster system or a shared raw device file or Oracle ASM(11gr2 onwards) . 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. A high redundancy disk group must contain at least three failure groups. The Oracle Clusterware has the OCR and voting disks open and is actively using them. 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. The text to speech can be used by them. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. Oracle Successfully replaced voting disk group with +OCR_NEWDG. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. OCR and Voting 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. 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. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. Note: After verfied on all nodes then move to OCR Disks. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. 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 Voting disks contain static and dynamic data. A voting disk is a file that manages information about node membership. 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. 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. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. It is used to process data from printed forms. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. 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. 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. (Both primary and mirrors) 2. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. The Windows default location for generating backups uses the same path structure. +OCR_NEWDG/RAC-cluster/spfileASM.ora. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 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. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. OCR and Voting However, each successive run must point to a different disk group. col path for a30 Voting disk management requires a valid and working OCR. 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. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. If you configure a single voting disk, then you should use external mirroring to provide redundancy. Is it illegal to lie about a felony on an application? 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. srvctl status diskgroup -g OCR_NEWDG --Connect with Grid User CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. on Oct 5 2010. 1. 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. For a full experience use one of the browsers below. Use the following procedure to restore OCR on Linux or UNIX systems: List the nodes in your cluster by running the following command on one node: Stop Oracle Clusterware by running the following command as root 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 root on all of the nodes: If you are restoring OCR to a cluster file system or network file system, then run the following command as root to restore OCR with an OCR backup that you can identify in "Listing Backup Files": After you complete this step, proceed to step 10. Cluster management is now affected on this particular node. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 1. 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. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. Voting files OMR technology scans a printed form and reads from predefined positions. It shares the same layout or structure as the OCR. 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. 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. Once an OCR location is created, it does not get updated in the Oracle Restart environment. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. 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. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. If voting disks are stored on Oracle ASM with normal or high redundancy, and the storage hardware in one failure group suffers a failure, then if there is another disk available in a disk group in an unaffected failure group, Oracle ASM recovers the voting disk in the unaffected failure group. If you run the ocrconfig -add | -repair | -replace command, then the device, file, or Oracle ASM disk group that you are adding must be accessible. OCR and Voting Disk You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. 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. 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. OCR and Voting Disk [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. 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. You must run the command as a user with administrative privileges. Oracle How do you write a referee report for a job application? c)A node must be able to access more than half of the voting disks at any time. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. 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. 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. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. It contains the following information shared across the nodes in the cluster. Save my name, email, and website in this browser for the next time I comment. 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++. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. to Restore OCR and Voting Disk Check the SPFILE location. 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. To migrate voting disks from Oracle ASM to an alternative storage device, specify the path to the non-Oracle ASM storage device with which you want to replace the Oracle ASM disk group using the following command: You can run this command on any node in the cluster. 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. ERROR: Unable to verify the graphical display setup. user13389425 Sep 7 2010 edited Sep 7 2010. If this problem is local to only one node, you can use other nodes to start your cluster database. 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. It records the data where marks are made on the form. 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. 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. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. OMR technology scans a printed form and reads from predefined positions. An advanced recognition engine is needed for OCR compared to OMR. It was first used in 1914 to help blind people in reading. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. In a nutshell, OCR is used by CRSd and OLR by the OHASd. col name for a20 The visually impaired people find it useful. 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. It was introduced in 11gR2, and is not shared by any other node in the cluster. 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. If all of the voting disks are corrupted, then you can restore them, as follows: Restore OCR as described in "Restoring Oracle Cluster Registry", if necessary. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. Oracle Clusterware uses voting files to determine which nodes are members of a (Both primary and mirrors) 2. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. Oracle Cluster Registry (OCR) which records cluster configuration information. Ensure that the most recent OCR contains the latest OCR updates. 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. OCR is more commonly used than Voting Disk. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. on Oct 5 2010. OCR is more commonly used than Voting Disk. 3. To add an OCRMIRROR device when only OCR device is defined: 3. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. Helpful tips . RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). It records the data where marks are made on the form. 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 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. Restore OCR by running the following command as root: Run the ocrcheck command to verify the integrity of OCR: Start Oracle High Availability Services by running the following command on all of the nodes: You can use the OCRDUMP and OCRCHECK utilities to diagnose OCR problems. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. 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. Its application is in google books, bank statements, business documents etc. Make sure that xdpyinfo exist under PATH variable. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. Our storage is EMC SAN. Change), You are commenting using your Facebook account. 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". Only after you use the replace verb to move voting disks back to non-Oracle ASM storage are the verbs add css votedisk and delete css votedisk again usable. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. to Backup OCR and Voting Disk Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. OCR and voting disk These files can be stored either in ASM or in shared storage. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). 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". 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. If the crsd process running on the node affected by the Oracle ASM instance failure is the OCR writer, the majority of the OCR locations are stored in Oracle ASM, and you attempt I/O on OCR during the time the Oracle ASM instance is down on this node, then crsd stops and becomes inoperable. Few possible scenarios:1. This post has been answered by user00726 on Sep 7 2010. Ensure that the file you created is visible from all nodes in the cluster. Oracle does not support having voting disks in Oracle ASM and directly on a cluster file system for the same cluster at the same time. Move the VotingDisk to new diskgroup. 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. 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. WebOCR 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. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. If you choose to store your voting disks in Oracle ASM, then Oracle ASM stores all the voting disks for the cluster in the disk group you choose. Modifying voting disks that are stored in Oracle ASM. My test systems OLR files has about 651 keys. 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. You cannot customize the backup frequencies or the number of files that Oracle Database retains. In this case, it is a little more difficult because:1. It is the rapid method of data entry. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. What are Consumer Forums and what is their importance? WebHello Friends,Here with one more topic on database administration guide. 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. However, if you upgrade from a previous version of Oracle Clusterware, you can migrate OCR to reside on Oracle ASM, and take advantage of the improvements in managing Oracle Clusterware storage. 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. OCR has a mechanism that prevents data loss due to accidental overwrites. (Both primary and mirrors)2. a) We must have an odd number of disks.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'techgoeasy_com-large-leaderboard-2','ezslot_13',194,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-leaderboard-2-0'); b)Oracle recommends a minimum of 3 and a maximum of 5. With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. select path,name,header_status from v$asm_disk Ensure there is at least 280 MB of space on the mount partition. -- Mount diskgroup Repairing an OCR involves either adding, deleting, or replacing an OCR location. Managing Oracle Cluster Registry and Voting Disks If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. OCR stores configuration information in a series of key-value pairs in a tree structure. Its primary purpose is to help in a situation where the private network communication fails.CSS (Cluster Synchronization Service) is the service that determines which nodes in the cluster are available via communication through a dedicated private network and with a voting disk used as a secondary communication mechanism. c)A node must be able to access more than half of the voting disks at any time. (LogOut/ voting disk While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. Verify the VotingDisk movement on both nodes. Oracle ASM manages voting disks differently from other files that it stores. Typically this is the work area and the recovery area. It contains key value pairs of various resources in the cluster. cluster. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks.