It was introduced in 11gR2, and is not shared by any other node in the cluster. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; Attempt to correct the problem using the OCR restoration procedure for your platform. 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. (LogOut/ It is the rapid method of data entry. col path for a30 The Oracle Clusterware has the OCR and voting disks open and is actively using them. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. 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. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Break-in heartbeats indicate a possible error scenario. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Find the temp usage by sessions in Oracle. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. Please sign in to comment Voting files Generally, the following information is found in the OLR. "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. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; 3. Oracle High Availability Services uses this information. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the 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. 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. Worked as a Development and Database Administrator. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. To remove a voting disk, run the following command, specifying one or more space-delimited, voting disk FUIDs or comma-delimited directory paths to the voting disks you want to remove: After you start CSS in exclusive mode, you can replace the voting disk, as follows: To migrate voting disks to Oracle ASM, specify the Oracle ASM disk group name in the following command: After modifying the voting disk, verify the voting disk location, as follows: Scripting on this page enhances content navigation, but does not change the content in any way. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Successfully replaced voting disk group with +OCR_NEWDG. This is true even in cases where there are no working voting disks. 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. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. A high redundancy disk group must contain at least three failure groups. Network heartbeat is successful, but disk heartbeat is missed.2. It stands for Optical Mark Reader or Optical Mark Recognition. For example, if the OCR location is /dev/sde1, then use the command syntax ocrconfig -repair -add /dev/sde1 on this node to repair OCR on that node. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. 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. An FRA diskgroup that holds archivelogs and backups. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. 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. c)A node must be able to access more than half of the voting disks at any time. Ensure that the Oracle ASM disk group that you specify exists and is mounted. The two file formats are incompatible and must not be interchangeably used. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. 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 Important points about Voting disks in Oracle RAC. If we are not using a voting disk, then due to network failure, nodes are neither able to communicate with each other nor synchronize with the database, this situation is called a cluster SPLIT-BRAIN problem. Note: In Shared storage you should create 3 minimum voting files in separate storage. This is called NETWORK HEARTBEAT. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 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. You cannot inspect the contents of an export. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. 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. In this case, a message to this effect is written in the KILL BLOCK of the node. It shares the same layout or structure as the OCR. Both heartbeats failed. Oracle Clusterware uses voting files to determine which nodes are members of a You can inspect a backup using the OCRDUMP utility. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. 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. What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? 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". 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. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. The ocrconfig -replace command requires that at least two OCR locations are configured. 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. You must instead use the -restore option, as described in the following sections. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. 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. This post has been answered by user00726 on Sep 7 2010. It is widely used as a form of data entry from printed paper data records into electronic editable text which can be easily searched, stored etc. Oracle ASM on ScaleIO Best Practices - Dell Technologies If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. [grid@RAC1 ~]$ asmcmd spget OCR and voting disk You can just replace with new voting file on disk group DATA. Run the following command to verify the current running version: Use the Oracle ASM Configuration Assistant (ASMCA) to configure and start Oracle ASM on all nodes in the cluster. OMR technology scans a printed form and reads from predefined positions. In a nutshell, OCR is used by CRSd and OLR by the OHASd. Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE 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). The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. It records the data where marks are made on the form. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. How do you write a referee report for a job application? 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. Oracle Local Registry is OCRs local counterpart. to Backup OCR and Voting Disk The destination of OCR file has been replaced. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. 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. 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. Move the VotingDisk to new diskgroup. 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. OCR 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 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. (Both primary and mirrors)2. 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. 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. OCR and voting disk Jump to Answer. 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 Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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. Ensure that the Oracle ASM disk group you specify exists and is mounted. 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. 1. OCR and Voting Disk Added on Sep 7 If the configurations do not match, run ocrconfig -repair. 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. Helpful tips . 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. This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. 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. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). OCR stores configuration information in a series of key-value pairs in a tree structure. 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. It contains manageability information about Oracle Clusterware, including dependencies between various services. difference between OCR and voting disk where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. For a full experience use one of the browsers below. Restore OCR with an OCR backup that you can identify in "Listing Backup Files" by running the following command as root: If you configured OCR in an Oracle ASM disk group, then ensure that the Oracle ASM disk group exists and is mounted. Voting disk management requires a valid and working OCR. 4. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 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. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget --Connect with Grid User The first method uses automatically generated OCR copies and the second method enables you to issue a backup command manually: Automatic backups: Oracle Clusterware automatically creates OCR backups every four hours. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. You can have up to five OCR locations. on Oct 5 2010. 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. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. The written block has a header area with the node name. difference between OCR and voting disk A failure group is a subset of the disks in a disk group. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. Learn how your comment data is processed. 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. the OCR, VotingDisk and spfile to new Just one node is unhealthy. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. OMR technology scans a printed form and reads from predefined positions. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 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". Oracle 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. Your biggest Honkai: Star Rail questions, answered Ocr For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. 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. There are a few different scenarios possible with missing heartbeats:1. 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. Move the SPFILE to newdiskgroup. 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. 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. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. to Restore OCR and Voting Disk By default, OLR is located at Grid_home/cdata/host_name.olr on each node. on Oct 5 2010. This section describes how to back up OCR content and use it for recovery. List the Candidate Disk present for creating DISKGROUP. The OLR and GPnP profile are required to start the HA service stack. In this case, it is a little more difficult because:1. # /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/). There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface At least two OCR locations if OCR is configured on an Oracle ASM disk group. You can just replace with new voting file on disk group DATA. This section includes the following topics: Adding an Oracle Cluster Registry Location, Removing an Oracle Cluster Registry Location, Replacing an Oracle Cluster Registry Location, Repairing an Oracle Cluster Registry Configuration on a Local Node, Overriding the Oracle Cluster Registry Data Loss Protection Mechanism. c)A node must be able to access more than half of the voting disks at any time. 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. 1. 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. Ensure there is at least 280 MB of space on the mount partition. 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. You can manually mirror OCR, as described in the "Adding an Oracle Cluster Registry Location" section, if you: Upgraded to Oracle Clusterware 11g release 2 (11.2) but did not choose to mirror OCR during the upgrade, Created only one OCR location during the Oracle Clusterware installation. OCR is more commonly used than Voting Disk. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. 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. It provides more accuracy as compared to OCR. Added on Sep 7 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. 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. 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. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). [grid@NODE01 ~]$ asmcmd spmove '+OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136' '+OCR_NEWDG/RAC-cluster/spfileASM.ora', --Verify It is useful in grading, calculating marks, etc. 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. CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. It records the data where marks are made on the form. 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 ocrconfig -manualbackup and ocrconfig -restore commands are compatible. 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. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. 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. [grid@NODE01 ~]$ crsctl query css votedisk. Optical Character Reader (OCR) is used to convert different types of documents such as scanned paper documents, PDF files or images captured by a digital camera into machine-encoded text. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system.