Oracle Grid Infrastructure Installation Guide for information about creating OCRs, Oracle Automatic Storage Management Administrator's Guide for more information about Oracle ASM disk group management. Oracle Clusterware can manage up to five redundant OCR locations. Required fields are marked *. 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. on Oct 5 2010. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. What are Consumer Forums and what is their importance? Typically this is the work area and the recovery area. You cannot directly influence the number of voting disks in one disk group. If you configure a single voting disk, then you should use external mirroring to provide redundancy. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. It is the rapid method of data entry. Each successive run of this command must point to a different file location. I am installing two node Oracle 11gR1 RAC on Solaris. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. 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. The destination of OCR file has been replaced. Hi, How the voting disk differ from the OCR. Both heartbeats failed. 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. OCR stores configuration information in a series of key-value pairs in a tree structure. user13389425 Sep 7 2010 edited Sep 7 2010. When the clusterware stack is down on all nodes in the cluster, the backups that are listed by the ocrconfig -showbackup command may differ from node to node. Restore Voting Disk Since we have restored OCR, we restored voting file as well. Voting disk management requires a valid and working OCR. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. 1. [grid@RAC1 ~]$ asmcmd spget 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. 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. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. The written block has a header area with the node name. If you move voting disks from one Oracle ASM disk group to another, then you can change the number of voting disks by placing them in a disk group of a different redundancy level as the former disk group. on Oct 5 2010. 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. OMR technology scans a printed form and reads from predefined positions. 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. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. Comments. 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). To display the voting disk FUID and file path of each current voting disk, run the crsctl query css votedisk command to display output similar to the following: This command returns a disk sequence number, the status of the disk, the FUID, the path of the disk, and the name of the Oracle ASM disk group on which the disk is stored. 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. 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. By default, OLR is located at Grid_home/cdata/host_name.olr on each node. col header_status for a20 However, each successive run must point to a different disk group. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 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. 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. 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. 1. 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. Its application is in google books, bank statements, business documents etc. Successfully replaced voting disk group with +OCR_NEWDG. --add the new diskgroup with root user. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; OCR is more commonly used than Voting Disk. 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. Few possible scenarios:1. Oracle Cluster Registry (OCR) which records cluster configuration information. 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. 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. List the Candidate Disk present for creating DISKGROUP. Depending on where you store your voting files, do one of the following: If the voting disks are stored in Oracle ASM, then run the following command to migrate the voting disks to the Oracle ASM disk group you specify: The Oracle ASM disk group to which you migrate the voting files must exist in Oracle ASM. Voting disks contain static and dynamic data. "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. 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 OCR stores configuration information in a series of key-value pairs in a tree structure. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. It stands for Optical Character Reader or Optical Character Recognition. Oracle Cluster Registry (OCR) which records cluster configuration information. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. (LogOut/ 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 Mirroring can help prevent OCR from becoming a single point of failure. This process is called DISK HEARTBEAT. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Our storage is EMC SAN. Your email address will not be published. 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. Is it illegal to lie about a felony on an application? If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. 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. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. Please sign in to comment Ensure there is at least 280 MB of space on the mount partition. It stands for Optical Mark Reader or Optical Mark Recognition. WebOCR and Voting Disk. 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 the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. To restore an OCR when clusterware is down. Is it illegal to lie about a felony on an application? c)A node must be able to access more than half of the voting disks at any time. OMR technology scans a printed form and reads from predefined positions. Check the SPFILE location. If it is, then stop it by running the following command as root: If you want to restore OCR to an Oracle ASM disk group, then you must first create a disk group using SQL*Plus that has the same name as the disk group you want to restore and mount it on the local node. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. In a nutshell, OCR is used by CRSd and OLR by the OHASd. col path for a30 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. srvctl status diskgroup -g OCR_NEWDG Attempt to resolve the cause of the CLSD-1009 and CLSD-1011 messages. 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. 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. These files can be stored either in ASM or in shared storage. 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. 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. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. This section describes how to back up OCR content and use it for recovery. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. OCR contains information about all Oracle resources in the cluster. If a resource fails, then before attempting to restore OCR, restart the resource. In this case, it is a little more difficult because:1. (Both primary and mirrors) 2. 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. Modifying voting disks that are stored in Oracle ASM. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. Important Operation for Voting disks in RACa) To list currently configured voting diskif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-mobile-banner-1','ezslot_15',198,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-mobile-banner-1-0'); Run the following command as the root user to remove a voting disk: Run the following command to back up a voting disk. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. Hi all, What is the difference b/w OCR and Voting Disk. OLR is located on local storage on each node in a cluster. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. Oracle recommends that you do not use more than five voting files, Following are the steps to move OCR, Voting Disk and Spfile to new disk group. Voting files which record node membership information. Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. Nytro.ai uses technology that works best in other browsers. 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. Use the following procedure to restore OCR on Linux or UNIX systems: List the nodes in your cluster by running the following command on one node: Stop Oracle Clusterware by running the following command as root 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 root on all of the nodes: If you are restoring OCR to a cluster file system or network file system, then run the following command as root to restore OCR with an OCR backup that you can identify in "Listing Backup Files": After you complete this step, proceed to step 10. You can find the location of the OCRFILE using one of the tow methods below. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. 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. Added on Sep 7 How do you write a referee report for a job application? (Both primary and mirrors)2. Attempt to correct the problem using the OCR restoration procedure for your platform. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. It shares the same layout or structure as the OCR. The location of OLR can be found in /etc/oracle/olr.loc. 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. Please sign in to comment 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. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. Note: In Shared storage you should create 3 minimum voting files in separate storage. Voting files The Oracle installation process for Oracle Clusterware gives you the option of automatically mirroring OCR. For example, if any node that is part of your current Oracle RAC cluster is shut down, then you must update the OCR configuration on the stopped node to let that node rejoin the cluster after the node is restarted. 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. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. It was first used in 1914 to help blind people in reading. 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. 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. (Both primary and mirrors) 2. Do this by using the ocrconfig -export command, which exports OCR content to a file format. If one fails it doesnt cause an outage and the failed one can be replaced. Majority of the keys in the OCRDUMPFILE deal with the CRSd. 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. Typically, one would simply cp or dd the files once the new storage has been presented to the hosts. Just one node is unhealthy. 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". 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. Voting files. If the original OCR location does not exist, then you must create an empty (0 byte) OCR location with appropriate permissions before you run the ocrconfig -add or ocrconfig -replace commands. 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. 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 Find the temp usage by sessions in Oracle. This site uses Akismet to reduce spam. Oracle Cluster Registry Note: After verfied on all nodes then move to OCR Disks. It was introduced in 11gR2, and is not shared by any other node in the cluster. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 2. It stores information about the local node only, mainly related to the OHASd (as we will see below). Our storage is EMC SAN. 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. Backups are created when the system is online. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. There are a few different scenarios possible with missing heartbeats:1. 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. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. Failure groups define disks that share components, such that if one fails then other disks sharing the component might also fail. 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. The Oracle Clusterware has the OCR and voting disks open and is actively using them. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. 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. 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.
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