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. 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. Hi all, What is the difference b/w OCR and Voting Disk. 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. 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 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. Is it illegal to lie about a felony on an application? This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. 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. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. col name for a20 1. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. At any one time, Oracle Database always retains the last three backup copies of OCR. 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. --Connect with Grid User 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. Mount and check status Diskgroup in all Nodes Verify the VotingDisk movement on both nodes. The goal of this note is to provide steps to add, remove, replace or move an Oracle Cluster Repository (OCR) and/or Voting Disk in Oracle Clusterware 10gR2, 11gR1 and 11gR2 environment. 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 such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. OCR is more commonly used than Voting Disk. 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. 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. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. Mirroring can help prevent OCR from becoming a single point of failure. 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 Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. There are a few different scenarios possible with missing heartbeats:1. The ocrconfig -replace command requires that at least two OCR locations are configured. You must instead use the -restore option, as described in the following sections. 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. The two file formats are incompatible and must not be interchangeably used. 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. You should configure OCR in two independent disk groups. 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. It was first used in 1914 to help blind people in reading. 2. 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. 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. user13389425 Sep 7 2010 edited Sep 7 2010. 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). For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Restore Voting Disk Since we have restored OCR, we restored voting file as well. "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. To restore an OCR when clusterware is down. 3) CSSD process in each RAC maintains the heartbeat in a block of size 1 OS block in the hot block of the voting disk at a specific offset. OCR stores configuration information in a series of key-value pairs in a tree structure. It records the data where marks are made on the form. If you store OCR on an Oracle ASM disk group and the disk group is not available, then you must recover and mount the Oracle ASM disk group. You cannot use the crsctl add | delete votedisk commands on voting disks stored in Oracle ASM disk groups because Oracle ASM manages the number of voting disks according to the redundancy level of the disk group. Few possible scenarios:1. Check the SPFILE location. This allows for the FRA diskgroup to be restored at a time slightly ahead of DATA, allowing Oracle to perform additional database recovery through the application of archivelogs. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. We and our partners share information on your use of this website to help improve your experience. How do you write a referee report for a job application? 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. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. The text to speech can be used by them. 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. Our storage is EMC SAN. "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. (Both primary and mirrors) 2. OCR is what registry is for Windows. You can just replace with new voting file on disk group DATA. 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. Ensure that the most recent OCR contains the latest OCR updates. The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/ every four hours (note timestamp of backup*.ocr files below). 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. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. Voting disk management requires a valid and working OCR. WebHello Friends,Here with one more topic on database administration guide. 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. It is used in scanning and converting different types of documents. Ensure that the file you created is visible from all nodes in the cluster. If one fails it doesnt cause an outage and the failed one can be replaced. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. Configure voting files on Oracle ASM or on shared storage. If this problem is local to only one node, you can use other nodes to start your cluster database. The CRSD process that creates the backups also creates and retains an OCR backup for each full day and at the end of each week. Break-in heartbeats indicate a possible error scenario. I am installing two node Oracle 11gR1 RAC on Solaris. OCR is more commonly used than Voting Disk. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. These backups are stored for a week and written in a round-robin fashion. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". It stands for Optical Character Reader or Optical Character Recognition. 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. 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. Comments. 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. WebHello Friends,Here with one more topic on database administration guide. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. An FRA diskgroup that holds archivelogs and backups. Move the SPFILE to newdiskgroup. 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 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 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. 10. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. 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. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. You can just replace with new voting file on disk group DATA. Please sign in to comment c)A node must be able to access more than half of the voting disks at any time. 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. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. srvctl status diskgroup -g OCR_NEWDG FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' Attempt to resolve the cause of the CLSD-1009 and CLSD-1011 messages. The written block has a header area with the node name. --add the new diskgroup with root user. Network heartbeat is successful, but disk heartbeat is missed.2. (Both primary and mirrors) 2. # /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/). 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. Change). 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.