You can remove an OCR location to reduce OCR-related overhead or to stop mirroring your OCR because you moved OCR to redundant storage such as RAID. Our storage is EMC SAN. Nytro.ai uses technology that works best in other browsers. 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. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. col path for a30 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. Ocr Oracle 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. 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. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. OCR is more commonly used than Voting Disk. You must instead use the -restore option, as described in the following sections. # /u01/app/11.2.0.4/grid/bin/ocrdump OCRDUMPFILE.root, # /u01/app/11.2.0.4/grid/bin/ocrdump -xml OCRDUMPFILE.root.xml, # /u01/app/11.2.0.4/grid/bin/ocrdump -xml -local OLRDUMPFILE.root.xml, # grep '' OLRDUMPFILE.root.xml|wc -l, # ls -trl /u01/app/11.2.0.4/grid/cdata/ol6-dr-114-rac1.olr, Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR), 12c: Backup NOARCHIVELOG database using RMAN, Howto: Apply July PSU 12c Grid and DB to an Oracle 12c 2 Node RAC cluster, Howto: Apply 12c Grid and DB PSU to Oracle 12c 2 node RAC, AIX RM PARAMETER LIST IS TOO LONG 0403 027 KSH, RMAN TSM TDPO TIVOLI BACKUP RECOVERY ORACLE, SQL OPTIMIZATION INDEX LIKE OPERATOR EXPLAIN PLAN, ASM diskgroups, volumes, filesystems, and instances, Its own backups (/etc/oracle/ocr.loc and local backups in $ORA_CRS_HOME/cdata/). For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. Jump to Answer. It was first used in 1914 to help blind people in reading. Note: In Shared storage you should create 3 minimum voting files in separate storage. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. Helpful tips . 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. 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. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. 11gR2 can have upto five mirrored copies of OCR. Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). 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. If one fails it doesnt cause an outage and the failed one can be replaced. 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. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. 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. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. 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. By using our site, you 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. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. An FRA diskgroup that holds archivelogs and backups. 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. Its application is in surveys, answer sheets, questionnaires and ballots. Check whether crsd is running. OMR technology scans a printed form and reads from predefined positions. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. 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. In addition, with numerous nodes, there are other possible scenarios too. The OLR and GPnP profile are required to start the HA service stack. Is it illegal to lie about a felony on an application? For Oracle Clusterware 12c, please refer to Software Patch Level and 12c Grid Infrastructure OCR Backup/Restore. Both heartbeats failed. The procedure described in the following list enables you to start the cluster using the available OCR location. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. Oracle Cluster Registry (OCR) which records cluster configuration information. You can inspect a backup using the OCRDUMP utility. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. When using a mix of storage pools with both high capacity spinning disks and high performance solid state devices additional diskgroups should be considered, which correspond to the different performance storage pools. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. 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. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. Oracle Clusterware uses voting files to determine which nodes are members of a FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' If you configure a single voting disk, then you should use external mirroring to provide redundancy. Oracle ASM on ScaleIO Best Practices - Dell Technologies It records the data where marks are made on the form. If the Oracle Restart home has been backed up, and if there is a failure, then restoring the Oracle Restart home restores 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. the OCR, VotingDisk and spfile to new 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). You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. OCR and Voting Disk [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup Please contact us at contactus@smarttechways.com, 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. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Use the following command to verify that Oracle Clusterware is running on the node on which the you are going to perform the replace operation: Run the following command as root to replace the current OCR location using either destination_file or +ASM_disk_group to indicate the current and target OCR locations: The preceding command fails if you have less than two configured OCR locations that are online. 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. In this case, it is a little more difficult because:1. on Oct 5 2010. OCR and voting disk You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. ERROR: Unable to verify the graphical display setup. It does not require an advanced level recognition engine when compared to OCR. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; You must run the command as a user with administrative privileges. Oracle ASM manages voting disks differently from other files that it stores. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". 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. 2. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. The location of OLR can be found in /etc/oracle/olr.loc. (Both primary and mirrors)2. For example, if you have configuration problems that you cannot resolve, or if you are unable to restart Oracle Clusterware after such changes, then restore your configuration using the procedure for your platform. 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. Voting Disk Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. 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. There are a few different scenarios possible with missing heartbeats:1. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. Difference between If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Disk Group ocr_newdg is running on node01,node02, 8. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. You cannot inspect the contents of an export. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. For any work, queries and help. Voting files. In this case, a message to this effect is written in the KILL BLOCK of the node. 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. Voting files To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. OCR stores configuration information in a series of key-value pairs in a tree structure. OCR 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. 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 Move the OCR to new diskgroup. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. You should configure OCR in two independent disk groups. You can have up to five OCR locations. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. Hi all, What is the difference b/w OCR and Voting Disk. Voting files which record node membership information. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. 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. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster.
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