difference between ocr and voting disk

You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. (LogOut/ Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). 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. An FRA diskgroup that holds archivelogs and backups. On Windows, use a dir command if the OCR location is a file and run GuiOracleObjectManager.exe to verify that the part of the cluster with the name exists. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. 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. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Just one node is unhealthy. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. Both heartbeats failed. The destination of OCR file has been replaced. Majority of the keys in the OCRDUMPFILE deal with the CRSd. 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. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. 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. 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. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. There are a few different scenarios possible with missing heartbeats:1. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. Voting disk management requires a valid and working OCR. Our storage is EMC SAN. I am installing two node Oracle 11gR1 RAC on Solaris. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. The visually impaired people find it useful. Save my name, email, and website in this browser for the next time I comment. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). Restore OCR with an OCR backup that you can identify in "Listing Backup Files" by running the following command as root: If you configured OCR in an Oracle ASM disk group, then ensure that the Oracle ASM disk group exists and is mounted. Added on Sep 7 If the crsd process running on the node affected by the Oracle ASM instance failure is the OCR writer, the majority of the OCR locations are stored in Oracle ASM, and you attempt I/O on OCR during the time the Oracle ASM instance is down on this node, then crsd stops and becomes inoperable. --add the new diskgroup with root user. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG Added on Sep 7 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. 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Oracle Clusterware uses voting files to determine which nodes are members of a Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). Oracle recommends that you use either automatic or manual backups, and the ocrconfig -restore command instead of the ocrconfig -export and ocrconfig -import commands to restore OCR for the following reasons: A backup is a consistent snapshot of OCR, whereas an export is not. 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. You can check the status of OLR on the local node using the OCRCHECK utility, as follows: You can display the content of OLR on the local node to the text terminal that initiated the program using the OCRDUMP utility, as follows: You can perform administrative tasks on OLR on the local node using the OCRCONFIG utility. 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. 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. Voting Disk. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. cluster. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. 1. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. Voting files The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. 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. Ensure that the Oracle ASM disk group that you specify exists and is mounted. Restoring the Oracle Cluster Registry on Linux or UNIX Systems, Restoring the Oracle Cluster Registry on Windows Systems, Restoring the Oracle Cluster Registry in an Oracle Restart Environment. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. By default, OLR is located at Grid_home/cdata/host_name.olr on each node. The Oracle Clusterware has the OCR and voting disks open and is actively using them. This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. 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. If voting disks are stored on Oracle ASM with normal or high redundancy, and the storage hardware in one failure group suffers a failure, then if there is another disk available in a disk group in an unaffected failure group, Oracle ASM recovers the voting disk in the unaffected failure group. OCR stores configuration information in a series of key-value pairs in a tree structure. 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. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. user13389425 Sep 7 2010 edited Sep 7 2010. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. 11gR2 can have upto five mirrored copies of OCR. 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. (Both primary and mirrors)2. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. I am installing two node Oracle 11gR1 RAC on Solaris. For any work, queries and help. 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 Use the following procedure to import OCR on Windows systems: Check whether crsd is running. The procedure described in the following list enables you to start the cluster using the available OCR location. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. col path for a30 Required fields are marked *. To add the file as an OCR location, 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 more than one OCR location. 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 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. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Oracle Local Registry is OCRs local counterpart. Using the crsctl replace votedisk command, you can move a given set of voting disks from one Oracle ASM disk group into another, or onto a certified file system. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. This is called NETWORK HEARTBEAT. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. 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. 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. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. 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. Verify the VotingDisk movement on both nodes. 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. When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. This site uses Akismet to reduce spam. Oracle Cluster Registry You can run this command more than once if there is more than one OCR location configured. 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". It contains key value pairs of various resources in the cluster. You can have up to five OCR locations. 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 contains manageability information about Oracle Clusterware, including dependencies between various services. 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. 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. b. Note: After verfied on all nodes then move to OCR 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 eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. --Connect with SQLPLUS ASM instance OCR stores Oracle Clusterware and Oracle RAC database configuration information The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. 4. In a nutshell, OCR is used by CRSd and OLR by the OHASd. Once an OCR location is created, it does not get updated in the Oracle Restart environment. 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. Jump to Answer. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. "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. srvctl status diskgroup -g OCR_NEWDG These files can be stored either in ASM or in shared storage. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 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. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. Mount and check status Diskgroup in all Nodes For example, the database cannot be started until the asm resource has come up, or the service resource doesnt start until the database has been started. Voting Disk. 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. For a full experience use one of the browsers below. Oracle Automatic Storage Management Administrator's Guide for more information about disk group redundancy and quorum failure groups, "Adding, Deleting, or Migrating Voting Disks" for information about migrating voting disks. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. Change). 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. +OCR_NEWDG/RAC-cluster/spfileASM.ora. ERROR: Unable to verify the graphical display setup. Find the temp usage by sessions in Oracle. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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.

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