Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. Once an OCR location is created, it does not get updated in the Oracle Restart environment. 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. If a resource fails, then before attempting to restore OCR, restart the resource. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. 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. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. 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 Ensure that the Oracle ASM disk group you specify exists and is mounted. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. 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. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. To restore an OCR when clusterware is down. 1. Hi all, What is the difference b/w OCR and Voting Disk. select path,name,header_status from v$asm_disk Your email address will not be published. It does not require an advanced level recognition engine when compared to OCR. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. 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. 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 add an OCRMIRROR device when only OCR device is defined: 3. At least two OCR locations if OCR is configured on an Oracle ASM disk group. c)A node must be able to access more than half of the voting disks at any time. An FRA diskgroup that holds archivelogs and backups. 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. 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. 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. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. Restore Voting Disk Since we have restored OCR, we restored voting file as well. Added on Sep 7 When you repair OCR on a stopped node using ocrconfig -repair, you must provide the same OCR file name (which should be case-sensitive) as the OCR file names on other nodes. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. col path for a30 Oracle High Availability Services uses this information. 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. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. Comments. Oracle Local Registry is OCRs local counterpart. "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. The ocrconfig -export and ocrconfig -import commands are compatible. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. Change). srvctl status diskgroup -g OCR_NEWDG Save my name, email, and website in this browser for the next time I comment. Disk Group ocr_newdg is running on node01,node02, 8. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. 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. Network heartbeat is successful, but disk heartbeat is missed.2. 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. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. Required fields are marked *. The ocrconfig -replace command requires that at least two OCR locations are configured. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; Oracle Clusterware can manage up to five redundant OCR locations. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. Backups are created when the system is online. 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. col header_status for a20 Both heartbeats failed. 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. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget 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. It is hard to implement as compared to OMR. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. The visually impaired people find it useful. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. It stands for Optical Mark Reader or Optical Mark Recognition. At any one time, Oracle Database always retains the last three backup copies of OCR. Oracle Cluster Registry 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. CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. 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. --With Spmove command we will move the spfile 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. A failure group is a subset of the disks in a disk group. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. 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. 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. 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. The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. 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. Is it illegal to lie about a felony on an application? An advanced recognition engine is needed for OCR compared to OMR. Basic information about the resources, their location, permissions, current value, type, state, etc. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. These files can be stored either in ASM or in shared storage. (Both primary and mirrors) 2. It stands for Optical Character Reader or Optical Character Recognition. 10. 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. 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. Make sure that xdpyinfo exist under PATH variable. 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.
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