If the Oracle Restart home has been backed up, and if there is a failure, then restoring the Oracle Restart home restores OCR. 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. The procedure described in the following list enables you to start the cluster using the available OCR location. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Hi all, What is the difference b/w OCR and Voting Disk. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. If OCR is stored in an Oracle ASM disk group with external redundancy, then Oracle recommends that you add another OCR location to another disk group to avoid the loss of OCR, if a disk fails in the disk group. Mount and check status Diskgroup in all Nodes 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. 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. OCR contains information about all Oracle resources in the cluster. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 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. It is useful in grading, calculating marks, etc. The Oracle Clusterware has the OCR and voting disks open and is actively using them. It provides more accuracy as compared to OCR. cluster. Remove an OCR location if, for example, your system experiences a performance degradation due to OCR processing or if you transfer your OCR to RAID storage devices and choose to no longer use multiple OCR locations, as described in the "Removing an Oracle Cluster Registry Location" section. In a nutshell, OCR is used by CRSd and OLR by the OHASd. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. b. 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. Check whether crsd is running. You can just replace with new voting file on disk group DATA. Find the temp usage by sessions in Oracle. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. Its application is in surveys, answer sheets, questionnaires and ballots. An FRA diskgroup that holds archivelogs and backups. OCR is more commonly used than Voting Disk. Then each node uses its local copy of OCR and the local CRSd process to access it and communicate via the same local process if they need more updates from the physical OCR file. By default, OLR is located at Grid_home/cdata/host_name.olr on each node. +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. 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. If a resource fails, then before attempting to restore OCR, restart the resource. Below is a table of differentiation between Optical Mark Reader (OMR) and Optical Character Reader (OCR): Difference between Optical Character Recognition (OCR) and Magnetic Ink Character Reader (MICR), Difference Between Electric Potential and Potential Difference, Difference between EMF and Potential Difference, Difference between Voltage Drop and Potential Difference, Difference between Difference Engine and Analytical Engine, Difference Between Single and Double Quotes in Shell Script and Linux, Difference between Time Tracking and Time and Attendance Software, Difference and Similarities between PHP and C, Similarities and Difference between Java and C++. OCR stores Oracle Clusterware and Oracle RAC database configuration information To replace or move the location of an OCR device, 4. 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. Oracle Clusterware uses voting files to determine which nodes are members of a It stands for Optical Character Reader or Optical Character Recognition. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. "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. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. This article is intended for DBA and Support Engineers who need to modify, or move OCR and voting disks files, customers who have an existing clustered environment deployed on a storage array and might want to migrate to a new storage array with minimal downtime. 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. WebOCR and Voting Disk. 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. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. Oracle Cluster Registry 1. 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. Ocr That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. 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. The two file formats are incompatible and must not be interchangeably used. Please sign in to comment For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. 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. OCR and Voting Disk Oracle Cluster Registry (OCR) which records cluster configuration information. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. OLR is located on local storage on each node in a cluster. If you configure a mirrored OCR and if Oracle Clusterware cannot access the mirrored OCR locations and also cannot verify that the available OCR location contains the most recent configuration, then Oracle Clusterware prevents further modification to the available 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 Recover the Oracle voting disk when its For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. OMR technology scans a printed form and reads from predefined positions. 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. Typically, one would simply cp or dd the files once the new storage has been presented to the hosts. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. If you choose to store the voting disks on a cluster file system, then select the option to configure multiple voting disks, in which case you will have to specify three different file systems based on different disks. Move the VotingDisk to new diskgroup. on Oct 5 2010. CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. [grid@NODE01 ~]$ asmcmd spmove '+OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136' '+OCR_NEWDG/RAC-cluster/spfileASM.ora', --Verify 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. 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. OCR and Voting OCR is what registry is for Windows. If one fails it doesnt cause an outage and the failed one can be replaced. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. We and our partners share information on your use of this website to help improve your experience. What is voting disks in RAC If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. 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". col header_status for a20 OCR and Voting (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 Oracle does not support having voting disks in Oracle ASM and directly on a cluster file system for the same cluster at the same time. You cannot customize the backup frequencies or the number of files that Oracle Database retains. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. I am installing two node Oracle 11gR1 RAC on Solaris. Ensure that the file you created is visible from all nodes in the cluster. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. 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. Learn how your comment data is processed. The OLR and GPnP profile are required to start the HA service stack. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. It was introduced in 11gR2, and is not shared by any other node in the cluster. 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. What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? At any one time, Oracle Database always retains the last three backup copies of OCR. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. By using our site, you 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. 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. The ocrconfig -export and ocrconfig -import commands are compatible. Make sure that xdpyinfo exist under PATH variable. 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. Added on Sep 7 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. The OLR only supports manual backups. An FRA diskgroup that holds archivelogs and backups. What is voting disks in RAC At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. --Connect with SQLPLUS ASM instance Is it illegal to lie about a felony on an application? 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. This post has been answered by user00726 on Sep 7 2010. 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. If the configurations do not match, run ocrconfig -repair. 1. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. 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. 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. 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". In addition, with numerous nodes, there are other possible scenarios too. to Backup OCR and Voting Disk 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. 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. 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.
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