difference between ocr and voting disk

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 site uses Akismet to reduce spam. Oracle Clusterware can manage up to five redundant OCR locations. You can just replace with new voting file on disk group DATA. Break-in heartbeat indicates a possible error scenario. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. OCR stores configuration information in a series of key-value pairs in a tree structure. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. 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. It is useful in grading, calculating marks, etc. The destination of OCR file has been replaced. The two file formats are incompatible and must not be interchangeably used. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_4',129,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_5',129,'0','1'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_1');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_6',129,'0','2'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_2');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_7',129,'0','3'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_3');.large-billboard-2-multi-129{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:2px!important;margin-left:auto!important;margin-right:auto!important;margin-top:2px!important;max-width:100%!important;min-height:250px;min-width:300px;padding:0;text-align:center!important}, Enter your email address to subscribe to this blog and receive notifications of new posts by email. The heartbeat counter increments every second on every write call. Check the Voting Disk Location 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 should configure OCR in two independent disk groups. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. We and our partners share information on your use of this website to help improve your experience. It is used in scanning and converting different types of documents. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. To change an Oracle Cluster Registry location: Use the OCRCHECK utility to verify that a copy of OCR other than the one you are going to replace is online, using the following command: OCRCHECK displays all OCR locations that are registered and whether they are available (online). 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. 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. Use the following command syntax as root on the restarted node where you use either a destination_file or +ASM_disk_group to indicate the current and target OCR locations: This operation only changes OCR on the node on which you run this command. 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. The OLR only supports manual backups. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. Begin to start Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: Run the following Cluster Verification Utility (CVU) command to verify OCR integrity of all of the nodes in your cluster database: OCR is present for backward compatibility. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. 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. 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. Both heartbeats failed. Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). 11gR2 can have upto five mirrored copies of OCR. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. It is hard to implement as compared to OMR. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. Ensure that the most recent OCR contains the latest OCR updates. 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. 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. To improve Oracle Clusterware storage manageability, OCR is configured, by default, to use Oracle ASM in Oracle Database 11g release 2 (11.2). FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. In a nutshell, OCR is used by CRSd and OLR by the OHASd. Each successive run of this command must point to a different file location. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. Voting files 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. Learn how your comment data is processed. c)A node must be able to access more than half of the voting disks at any time. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. (Both primary and mirrors) 2. An FRA diskgroup that holds archivelogs and backups. c)A node must be able to access more than half of the voting disks at any time. At least two OCR locations if OCR is configured on an Oracle ASM disk group. Successfully replaced voting disk group with +OCR_NEWDG. A failure group is a subset of the disks in a disk group. 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. This means that a device must exist. cluster. [grid@NODE01 ~]$ crsctl query css votedisk. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. --add the new diskgroup with root user. In this case, it is a little more difficult because:1. 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. 1. WebOCR and Voting Disk. +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. Restore Voting Disk Since we have restored OCR, we restored voting file as well. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. 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. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. Basic information about the resources, their location, permissions, current value, type, state, etc. Backups are created when the system is online. 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. 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. 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. 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. col name for a20 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. Hi, How the voting disk differ from the OCR. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. 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. b. Oracle Cluster Registry (OCR) which records cluster configuration information. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 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. 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. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. Disk heartbeat is successful, but network heartbeat is missed.3. It contains key value pairs of various resources in the cluster. If you upgrade from a previous version of Oracle Clusterware to Oracle Clusterware 11g release 2 (11.2) and you want to store voting disks in an Oracle ASM disk group, then you must set the ASM Compatibility (COMPATIBLE.ASM) compatibility attribute to 11.2.0.0. Is it illegal to lie about a felony on an application? OLR is located on local storage on each node in a cluster. OCR stores Oracle Clusterware and Oracle RAC database configuration information However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. OMR technology scans a printed form and reads from predefined positions. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. Mount and check status Diskgroup in all Nodes Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. Comments. Typically this is the work area and the recovery area. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. It is used to process data from printed forms. CREATE DISKGROUP OCR_NEWDG NORMAL REDUNDANCY 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. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. 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. This section describes how to back up OCR content and use it for recovery. 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 more commonly used than Voting Disk. 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. The ocrconfig -replace command requires that at least two OCR locations are configured. 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.

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