Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. 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. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Use the following procedure to import OCR on Windows systems: Check whether crsd is running. Only after you use the replace verb to move voting disks back to non-Oracle ASM storage are the verbs add css votedisk and delete css votedisk again usable. Backups are created when the system is online. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. This is true even in cases where there are no working voting disks. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. col name for a20 Voting Disk. Ensure there is at least 280 MB of space on the mount partition. I am installing two node Oracle 11gR1 RAC on Solaris. 4. Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). OCR stores configuration information in a series of key-value pairs in a tree structure. These backups are stored for a week and written in a round-robin fashion. CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. 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. OCR contains information about all Oracle resources in the cluster. Disk Group ocr_newdg is running on node01,node02, 8. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. 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. 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. Oracle Cluster Registry (OCR) which records cluster configuration information. Oracle Local Registry is OCRs local counterpart. As a definitive verification that OCR failed, run ocrcheck and if the command returns a failure message, then both the primary OCR and the OCR mirror have failed. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. It records the data where marks are made on the form. It contains manageability information about Oracle Clusterware, including dependencies between various services. You must instead use the -restore option, as described in the following sections. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. It is hard to implement as compared to OMR. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. Modifying voting disks that are stored in Oracle ASM. Voting Disk. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. These files can be stored either in ASM or in shared storage. A high redundancy disk group must contain at least three failure groups. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. You can inspect a backup using the OCRDUMP utility. 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. Run the following command to inspect the contents and verify the integrity of the backup file: You can use any backup software to copy the automatically generated backup files at least once daily to a different device from where the primary OCR resides. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. 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. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. 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. --Connect with Grid User By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. [grid@NODE01 ~]$ crsctl query css votedisk. Network heartbeat is successful, but disk heartbeat is missed.2. 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. Voting disks contain static and dynamic data. Static data: Info about nodes in the cluster. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Its application is in google books, bank statements, business documents etc. If you upgrade from a previous version of Oracle Clusterware to Oracle Clusterware 11g release 2 (11.2) and you want to store voting disks in an Oracle ASM disk group, then you must set the ASM Compatibility (COMPATIBLE.ASM) compatibility attribute to 11.2.0.0. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. (Both primary and mirrors) 2. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; 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. 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. Once an OCR location is created, it does not get updated in the Oracle Restart environment. 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. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. This means that a device must exist. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. It is located on the shared cluster system or a shared raw device file or Oracle ASM(11gr2 onwards) . Jump to Answer. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Oracle Cluster Registry 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". Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. It contains key value pairs of various resources in the cluster. OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. Voting files. 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. If you choose to store your voting disks in Oracle ASM, then Oracle ASM stores all the voting disks for the cluster in the disk group you choose. To replace all voting disks not stored in Oracle ASM with voting disks managed by Oracle ASM in an Oracle ASM disk group, run the following command: Modifying voting disks that are not stored on Oracle ASM: To display the voting disk FUID and file path of each current voting disk, run the following command: This command returns a disk sequence number, the status of the disk, the FUID, and the path of the disk and no name of an Oracle ASM disk group. 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. 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 OLR only supports manual backups. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. The location of OLR can be found in /etc/oracle/olr.loc. It was introduced in 11gR2, and is not shared by any other node in the cluster. Despite the fact that crsctl query css votedisk reports zero vote disks in use, Oracle Clusterware remembers the fact that Oracle ASM was in use and the replace verb is required. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. Learn how your comment data is processed. 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. Oracle Clusterware uses voting files to determine which nodes are members of a 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. 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 This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. 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 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. 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. Its primary purpose is to help in a situation where the private network communication fails.CSS (Cluster Synchronization Service) is the service that determines which nodes in the cluster are available via communication through a dedicated private network and with a voting disk used as a secondary communication mechanism. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. user13389425 Sep 7 2010 edited Sep 7 2010. 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. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. It is the rapid method of data entry. It maintains and consists of important details about the cluster nodes membership, such as which node is part of the cluster, who (node) is joining the cluster, and who (node) is leaving the cluster. 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. 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. The Oracle Clusterware has the OCR and voting disks open and is actively using them. A failure group is a subset of the disks in a disk group. It records the data where marks are made on the form. col path for a30 "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. 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. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. 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. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. 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. If one fails it doesnt cause an outage and the failed one can be replaced. Hi all, What is the difference b/w OCR and Voting Disk. Attempt to correct the problem using the OCR restoration procedure for your platform. Check whether crsd is running. Oracle Cluster Registry (OCR) which records cluster configuration information. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. Successfully replaced voting disk group with +OCR_NEWDG. The destination of OCR file has been replaced. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. 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. To replace or move the location of an OCR device, 4. Voting files. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. CREATE DISKGROUP OCR_NEWDG NORMAL REDUNDANCY For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. Note: After verfied on all nodes then move to OCR Disks. You cannot directly influence the number of voting disks in one disk group. 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. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. --add the new diskgroup with root user. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. Ensure that the most recent OCR contains the latest OCR updates. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. If it is, stop it by running the following command as root: Import OCR by running the following command as root: If you are importing OCR to a cluster or network file system, then skip to step 7. What are Consumer Forums and what is their importance? If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. For example, if you have configuration problems that you cannot resolve, or if you are unable to restart Oracle Clusterware after such changes, then restore your configuration using the procedure for your platform. By default, OLR is located at Grid_home/cdata/host_name.olr on each node. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. The heartbeat counter increments every second on every write call. 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. The written block has a header area with the node name. 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. 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. 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 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. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Use ASMCA to create an Oracle ASM disk group that is at least the same size of the existing OCR and has at least normal redundancy. (LogOut/ Oracle Cluster Registry (OCR) which records cluster configuration information. (Both primary and mirrors)2. 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. Note: In Shared storage you should create 3 minimum voting files in separate storage. For a full experience use one of the browsers below. 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. # /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 '
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