difference between ocr and voting disk

Oracle ASM manages voting disks differently from other files that it stores. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. Oracle recommends that you use either automatic or manual backups, and the ocrconfig -restore command instead of the ocrconfig -export and ocrconfig -import commands to restore OCR for the following reasons: A backup is a consistent snapshot of OCR, whereas an export is not. Hi, How the voting disk differ from the OCR. It records the data where marks are made on the form. --With Spmove command we will move the spfile document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option. 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. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. The destination of OCR file has been replaced. Look at output from the ocrdump command and determine whether it has your latest updates. 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. Voting files. The heartbeat counter increments every second on every write call. OCR 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. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE 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. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. Check the Voting Disk Location OCR If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. 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 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. 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". Voting Disk, should it be 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 You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. Oracle Clusterware can manage up to five redundant OCR locations. Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. 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. 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. WebOCR and Voting Disk. It records the data where marks are made on the form. Oracle Cluster Registry (OCR) which records cluster configuration information. List the Candidate Disk present for creating DISKGROUP. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. 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. This is called NETWORK HEARTBEAT. 10. Helpful tips . The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. (Both primary and mirrors) 2. 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. It contains the following information shared across the nodes in the cluster. My test systems OLR files has about 651 keys. 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. The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. 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. Typically, one would simply cp or dd the files once the new storage has been presented to the hosts. To migrate OCR from Oracle ASM to another storage type: Create a file in a shared or cluster file system with the following permissions: root, oinstall, 640. WebHello Friends,Here with one more topic on database administration guide. 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. (Both primary and mirrors)2. srvctl status diskgroup -g OCR_NEWDG I am installing two node Oracle 11gR1 RAC on Solaris. 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. 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. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. 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. 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. 3. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. You can just replace with new voting file on disk group DATA. 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. srvctl start diskgroup -g OCR_NEWDG -n NODE01,NODE02, --Check Status Check the SPFILE location. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. 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. This section describes how to back up OCR content and use it for recovery. Hi, How the voting disk differ from the OCR. However, each successive run must point to a different disk group. 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. Ocr In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. 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. Oracle 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 disks. Begin to start Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: Run the following Cluster Verification Utility (CVU) command to verify OCR integrity of all of the nodes in your cluster database: OCR is present for backward compatibility. OCR While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. 4. Attempt to resolve the cause of the CLSD-1009 and CLSD-1011 messages. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. It does not require an advanced level recognition engine when compared to OCR. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. Hi all, What is the difference b/w OCR and Voting Disk. c)A node must be able to access more than half of the voting disks at any time. [grid@RAC1 ~]$ asmcmd spget 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. 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 Managing Oracle Cluster Registry and Voting Disks 3. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface (LogOut/ 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. 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. This post has been answered by user00726 on Sep 7 2010. 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. col path for a30 I am installing two node Oracle 11gR1 RAC on Solaris. Voting files. Ensure that the Oracle ASM disk group you specify exists and is mounted. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. OCR c)A node must be able to access more than half of the voting disks at any time. Oracle Ensure that the most recent OCR contains the latest OCR updates. Mount and check status Diskgroup in all Nodes 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. You can find the location of the OCRFILE using one of the tow methods below. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. Backups are created when the system is online. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. The two file formats are incompatible and must not be interchangeably used. 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 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. -- Mount diskgroup Just one node is unhealthy. At any one time, Oracle Database always retains the last three backup copies of OCR. It was first used in 1914 to help blind people in reading. difference between OCR and voting disk Check whether crsd is running. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. Repairing an OCR involves either adding, deleting, or replacing an OCR location. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Please do provide the feedback, Related ArticlesWhat is Oracle Clusterware?How to Recreate Central Inventory in Real Applications ClustersHow to add any node to Oracle RAC cluster in 10g and 11gHow to setup diag wait in clusterCluster command in Oracle clusterware 10g and 11gOracle Flex Cluster 12c, Filed Under: Oracle, Oracle Database Tagged With: voting disks, Your email address will not be published. In a nutshell, OCR is used by CRSd and OLR by the OHASd. It stands for Optical Character Reader or Optical Character Recognition. Ensure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. If you have only one OCR location configured and online, then you must first add a new location and then delete the failed location, as follows: It may be necessary to repair OCR if your cluster configuration changes while that node is stopped and this node is the only member in the cluster. It contains key value pairs of various resources in the cluster. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; 1. to Backup OCR and Voting Disk --add the new diskgroup with root user. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. Mirroring can help prevent OCR from becoming a single point of failure. Helpful tips . OCR also helps maintain the structure and dependencies that exist in the startup of various resources in the cluster. However, Oracle recommends using several failure groups. It is hard to implement as compared to OMR. Disk Group ocr_newdg is running on node01,node02, 8. Please sign in to comment 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). This process is called DISK HEARTBEAT. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. Verify the VotingDisk movement on both nodes. Use the following procedure to restore OCR in an Oracle Restart environment: Stop Oracle High Availability Services by running the following command on all of the nodes: Run the ocrcheck -config command to determine the OCR location and then create an empty (0 byte) OCR location with appropriate permissions in that location. 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. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG If one fails it doesnt cause an outage and the failed one can be replaced. 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. b. Break-in heartbeat indicates a possible error scenario. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup Majority of the keys in the OCRDUMPFILE deal with the CRSd. OCR and Voting Disk Your email address will not be published. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. 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. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. The text to speech can be used by them. 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. Recover the Oracle voting disk when its Voting Disk 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. The destination of OCR file has been replaced. (Both primary and mirrors) 2. To migrate voting disks from Oracle ASM to an alternative storage device, specify the path to the non-Oracle ASM storage device with which you want to replace the Oracle ASM disk group using the following command: You can run this command on any node in the cluster. Your biggest Honkai: Star Rail questions, answered 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. 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. Modifying voting disks that are stored in Oracle ASM. There are a few different scenarios possible with missing heartbeats:1. Is it illegal to lie about a felony on an application? Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Comments. This command updates the OCR configuration on all of the nodes on which Oracle Clusterware is running. Please sign in to comment You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. You must run the command as a user with administrative privileges. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. 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. This means that a device must exist.

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