-- Mount diskgroup Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. At any one time, Oracle Database always retains the last three backup copies of OCR. 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. 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. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. Check the SPFILE location. Ocr The two file formats are incompatible and must not be interchangeably used. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Oracle does not support storing OCR on different storage types simultaneously, such as storing OCR on both Oracle ASM and a shared file system, except during a migration. 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. (LogOut/ The destination of OCR file has been replaced. In this case, it is a little more difficult because:1. 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. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Move the SPFILE to newdiskgroup. CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. You can inspect a backup using the OCRDUMP utility. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. OCR and Voting 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. Typically, one would simply cp or dd the files once the new storage has been presented to the hosts. 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". However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. OCR By using our site, you 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. 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. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. What is voting disks in RAC 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. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. 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. 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 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. 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. --Connect with Grid User Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. In a nutshell, OCR is used by CRSd and OLR by the OHASd. "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. You must run the command as a user with administrative privileges. If it is, stop it by running the following command as a member of the Administrators group: Import OCR by running the following command as a member of the Administrators group: In Oracle Clusterware 11g release 2 (11.2), each node in a cluster has a local registry for node-specific resources, called an Oracle Local Registry (OLR), that is installed and configured when Oracle Clusterware installs OCR. Voting files. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. col name for a20 FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. 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 If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. 1. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status OCR is used in a variety of applications, such as scanning documents and recognizing text in images. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. The Oracle Clusterware has the OCR and voting disks open and is actively using them. At least two OCR locations if OCR is configured on an Oracle ASM disk group. Mirroring can help prevent OCR from becoming a single point of failure. 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. col header_status for a20 to Restore OCR and Voting Disk List the Candidate Disk present for creating DISKGROUP. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. However, Oracle recommends using several failure groups. OCR Restore Voting Disk Since we have restored OCR, we restored voting file as well. It is useful in grading, calculating marks, etc. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. Oracle Cluster Registry (OCR) which records cluster configuration information. Look at output from the ocrdump command and determine whether it has your latest updates. 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. Recover the Oracle voting disk when its Comments. 1. Move the OCR to new diskgroup. 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. Jump to Answer. Attempt to correct the problem using the OCR restoration procedure for your platform. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. 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. 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. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. 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. 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. 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. Typically this is the work area and the recovery area. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. 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. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. user13389425 Sep 7 2010 edited Sep 7 2010. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. 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.
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