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. 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. 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 you run the ocrconfig -add | -repair | -replace command, then the device, file, or Oracle ASM disk group that you are adding must be accessible. 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. It records the data where marks are made on the form. srvctl status diskgroup -g OCR_NEWDG 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. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. The written block has a header area with the node name. 3. 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. It is used to process data from printed forms. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. Move the OCR to new diskgroup. Look at output from the ocrdump command and determine whether it has your latest updates. 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. 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. To restore an OCR when clusterware is down. OCR stores Oracle Clusterware and Oracle RAC database configuration information --Connect with Grid User 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. 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. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. For example, if two-way mirroring is specified for a file, then redundant copies of file extents must be stored in separate failure groups. The Windows default location for generating backups uses the same path structure. It shares the same layout or structure as the OCR. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. 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. Voting disks/files are just like attendance registers where you have nodes mark their attendance (heartbeats). 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Is it illegal to lie about a felony on an application? For example, if any node that is part of your current Oracle RAC cluster is shut down, then you must update the OCR configuration on the stopped node to let that node rejoin the cluster after the node is restarted. When any node is not able to send a heartbeat to the voting disk, then it will reboot itself.For high availability, Oracle recommends that you have a minimum of three voting disks. 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. 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. An advanced recognition engine is needed for OCR compared to OMR. WebHello Friends,Here with one more topic on database administration guide. Network heartbeat is successful, but disk heartbeat is missed.2. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. To change an Oracle Cluster Registry location: Use the OCRCHECK utility to verify that a copy of OCR other than the one you are going to replace is online, using the following command: OCRCHECK displays all OCR locations that are registered and whether they are available (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. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. 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. Break-in heartbeats indicate a possible error scenario. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. 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). To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. Oracle Cluster Registry (OCR) which records cluster configuration information. The Oracle Clusterware has the OCR and voting disks open and is actively using them. Added on Sep 7 When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. Check whether crsd is running. At least two OCR locations if OCR is configured on an Oracle ASM disk group. "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. (LogOut/ Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. This site uses Akismet to reduce spam. Few possible scenarios:1. The ocrconfig -export and ocrconfig -import commands are compatible. To add a new disk and remove the existing disk, run the following command, replacing the path_to_voting_diskB variable with the fully qualified path name of voting disk B: The -purge option deletes existing voting disks. By default, the -showbackup option displays information for both automatic and manual backups but you can include the auto or manual flag to display only the automatic backup information or only the manual backup information, respectively. 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. Run the following command as root from only one node to start the Oracle Clusterware stack in exclusive mode, which does not require voting files to be present or usable: Run the crsctl query css votedisk command to retrieve the list of voting files currently defined, similar to the following: This list may be empty if all voting disks were corrupted, or may have entries that are marked as status 3 or OFF. 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. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. In addition to maintaining its own disk block, CSSD processes also monitor the disk block maintained by the CSSD processes of other nodes in the cluster. However, Oracle recommends using several failure groups. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. cluster. However, if you are unable to start any cluster node in your environment and if you can neither repair OCR nor restore access to all OCR locations, then you can override the protection mechanism. Oracle Cluster Registry (OCR) which records cluster configuration information. Comments. This is true even in cases where there are no working voting disks. 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". CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. 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. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. The location of OLR can be found in /etc/oracle/olr.loc. The procedure described in the following list enables you to start the cluster using the available OCR location. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. To add an OCRMIRROR device when only OCR device is defined: 3. Stop Oracle Clusterware on the node where it is running in exclusive mode: Run the ocrconfig -repair -replace command as root on all the nodes in the cluster where you did not the ocrconfig -restore command. In a nutshell, OCR is used by CRSd and OLR by the OHASd. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. Save my name, email, and website in this browser for the next time I comment. OCR is what registry is for Windows. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. These files can be stored either in ASM or in shared storage. This section describes how to back up OCR content and use it for recovery. 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++. Repairing an OCR involves either adding, deleting, or replacing an OCR location. Use the following procedure to import OCR on Linux or UNIX systems: Check whether crsd is running. Learn how your comment data is processed. Find the temp usage by sessions in Oracle. Static data: Info about nodes in the cluster. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. In this case, a message to this effect is written in the KILL BLOCK of the node. Nytro.ai uses technology that works best in other browsers. OCR stores configuration information in a series of key-value pairs in a tree structure. 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 When using a mix of storage pools with both high capacity spinning disks and high performance solid state devices additional diskgroups should be considered, which correspond to the different performance storage pools. Generally, the following information is found in the OLR. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. 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. WebOCR and Voting Disk. The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. col name for a20 Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Oracle Cluster Registry The heartbeat counter increments every second on every write call. Make sure that xdpyinfo exist under PATH variable. # /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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