difference between ocr and voting disk

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. These files can be stored either in ASM or in shared storage. 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. At least two OCR locations if OCR is configured on an Oracle ASM disk group. 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. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. To display the voting disk FUID and file path of each current voting disk, run the crsctl query css votedisk command to display output similar to the following: This command returns a disk sequence number, the status of the disk, the FUID, the path of the disk, and the name of the Oracle ASM disk group on which the disk is stored. Your email address will not be published. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. Majority of the keys in the OCRDUMPFILE deal with the CRSd. This article is intended for DBA and Support Engineers who need to modify, or move OCR and voting disks files, customers who have an existing clustered environment deployed on a storage array and might want to migrate to a new storage array with minimal downtime. Repair an OCR location if Oracle Database displays an OCR failure alert in Oracle Enterprise Manager or in the Oracle Clusterware alert log file, as described in the "Repairing an Oracle Cluster Registry Configuration on a Local Node" section. Modifying voting disks that are stored in Oracle ASM. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. 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. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. Save my name, email, and website in this browser for the next time I comment. 1. It contains manageability information about Oracle Clusterware, including dependencies between various services. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. Ensure that the file you created is visible from all nodes in the cluster. 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. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. Voting disk management requires a valid and working OCR. It stands for Optical Mark Reader or Optical Mark Recognition. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. 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 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. Is it illegal to lie about a felony on an application? -- Mount diskgroup The two file formats are incompatible and must not be interchangeably used. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. Check the SPFILE location. Voting files 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. 10. Please sign in to comment WebOCR and Voting Disk. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. Mount and check status Diskgroup in all Nodes Use the following procedure to import OCR on Windows systems: Check whether crsd is running. The destination of OCR file has been replaced. 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. 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. WebHello Friends,Here with one more topic on database administration guide. It is hard to implement as compared to OMR. "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. [grid@NODE01 ~]$ crsctl query css votedisk. Mirroring can help prevent OCR from becoming a single point of failure. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. CRS-4266: Voting file(s) successfully replaced, 9. In this case, a message to this effect is written in the KILL BLOCK of the node. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. 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. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. My test systems OLR files has about 651 keys. Backups are created when the system is online. If it is, stop it by running the following command as root: Import OCR by running the following command as root: If you are importing OCR to a cluster or network file system, then skip to step 7. It does not require an advanced level recognition engine when compared to OCR. OCR stores configuration information in a series of key-value pairs in a tree structure. 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. When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. Check the location of OCR Disk from GRID Home with root user. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. on Oct 5 2010. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC. Oracle Clusterware uses voting files to determine which nodes are members of a Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE +OCR_NEWDG/RAC-cluster/spfileASM.ora. --add the new diskgroup with root user. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. Voting files which record node membership information. col path for a30 Failure groups define disks that share components, such that if one fails then other disks sharing the component might also fail. 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. 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. You cannot customize the backup frequencies or the number of files that Oracle Database retains. 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 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 disks. 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. An FRA diskgroup that holds archivelogs and backups. As the root user, run the following command to add an OCR location to either Oracle ASM or other storage device: To remove an OCR location or a failed OCR location, at least one other OCR must be online. --Connect with Grid User If you cannot mount the disk group locally, then run the following SQL*Plus command: Optionally, if you want to restore OCR to a raw device, then you must run the ocrconfig -repair -replace command as root, assuming that you have all the necessary permissions on all nodes to do so and that OCR was not previously on Oracle ASM. 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 the rapid method of data entry. cluster. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. 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. (Both primary and mirrors) 2. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. 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. Ensure that the most recent OCR contains the latest OCR updates. Ensure there is at least 280 MB of space on the mount partition. 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. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. Look at output from the ocrdump command and determine whether it has your latest updates. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. There are a few different scenarios possible with missing heartbeats:1. If you scroll through the key names below you will observe that most of the information pertains to the local resources required by OHASd (refer to the flow chart in the earlier post to see which values this file would hold). A high redundancy disk group must contain at least three failure groups. Attempt to correct the problem using the OCR restoration procedure for your platform. A normal redundancy disk group must contain at least two failure groups but if you are storing your voting disks on Oracle ASM, then a normal redundancy disk group must contain at least three failure groups. (Both primary and mirrors)2. Required fields are marked *. srvctl status diskgroup -g OCR_NEWDG Hi all, What is the difference b/w OCR and Voting Disk. user13389425 Sep 7 2010 edited Sep 7 2010. The written block has a header area with the node name. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. Move the VotingDisk to new diskgroup. To add a new disk and remove the existing disk, run the following command, replacing the path_to_voting_diskB variable with the fully qualified path name of voting disk B: The -purge option deletes existing voting disks. FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' Then each node uses its local copy of OCR and the local CRSd process to access it and communicate via the same local process if they need more updates from the physical OCR file. If you are storing OCR on an Oracle ASM disk group, and that disk group is corrupt, then you must restore the Oracle ASM disk group using Oracle ASM utilities, and then mount the disk group again before recovering OCR. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' OMR technology scans a printed form and reads from predefined positions. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. Oracle ASM manages voting disks differently from other files that it stores. This section describes how to back up OCR content and use it for recovery. 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. 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. 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. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. 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. 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. Oracle recommends that you do not use more than five voting files, Following are the steps to move OCR, Voting Disk and Spfile to new disk group. Oracle Local Registry is OCRs local counterpart. By using our site, you In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. The Oracle Clusterware has the OCR and voting disks open and is actively using them. 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. 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 OCR is what registry is for Windows. Disk heartbeat is successful, but network heartbeat is missed.3. This is called NETWORK HEARTBEAT. 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. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. 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. 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 provides more accuracy as compared to OCR. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. Hi all, What is the difference b/w OCR and Voting Disk. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Generally, the following information is found in the OLR. The text to speech can be used by them. This site uses Akismet to reduce spam. 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. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; OMR technology scans a printed form and reads from predefined positions. 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. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. If this problem is local to only one node, you can use other nodes to start your cluster database. Use ASMCA to create an Oracle ASM disk group that is at least the same size of the existing OCR and has at least normal redundancy. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Helpful tips . Voting Disk. Our storage is EMC SAN. This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. The Windows default location for generating backups uses the same path structure. For any work, queries and help. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. Restore Voting Disk Since we have restored OCR, we restored voting file as well. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. (LogOut/ 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. ocrdump should be executed as root to display all the keys available. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. Jump to Answer. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. 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. The location of OLR can be found in /etc/oracle/olr.loc. 1. OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'techgoeasy_com-leader-1','ezslot_11',195,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-leader-1-0');2) In a shared storage system, we need to manually configure these files with a redundancy setup for high availability. Voting Disk. 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. For a full experience use one of the browsers below. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". You can just replace with new voting file on disk group DATA. Learn how your comment data is processed. You can just replace with new voting file on disk group DATA. For example, if you ran the ocrconfig -restore command on node 1 of a four-node cluster, then you must run the ocrconfig -repair -replace command on nodes 2, 3, and 4. 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++. Voting files. 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. Jump to Answer. If the configurations match, ensure that the node can access all of the configured OCRs by running an ls command on Linux and UNIX systems. Hi, How the voting disk differ from the OCR. 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. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. 11gR2 can have upto five mirrored copies of OCR. If a resource fails, then before attempting to restore OCR, restart the resource. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Typically this is the work area and the recovery area. These backups are stored for a week and written in a round-robin fashion. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster.

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