difference between ocr and voting disk

An FRA diskgroup that holds archivelogs and backups. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Oracle Automatic Storage Management Administrator's Guide, Oracle Grid Infrastructure Installation Guide, "Troubleshooting Oracle Cluster Registry", "Adding an Oracle Cluster Registry Location", "Replacing an Oracle Cluster Registry Location", "Repairing an Oracle Cluster Registry Configuration on a Local Node", "Removing an Oracle Cluster Registry Location", Appendix G, "Oracle Cluster Registry Utility Reference", "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands", Appendix A, "Cluster Verification Utility Reference", "Adding, Deleting, or Migrating Voting Disks". 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. Ensure that the Oracle ASM disk group that you specify exists and is mounted. 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. 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. 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. If a resource fails, then before attempting to restore OCR, restart the resource. 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. If this problem is local to only one node, you can use other nodes to start your cluster database. Move the OCR to new diskgroup. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). A failure group is a subset of the disks in a disk group. The Oracle Clusterware has the OCR and voting disks open and is actively using them. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. OLR is located on local storage on each node in a cluster. You can just replace with new voting file on disk group DATA. CREATE DISKGROUP OCR_NEWDG NORMAL REDUNDANCY 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. If you configure a single voting disk, then you should use external mirroring to provide redundancy. 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 Local Registry is OCRs local counterpart. An advanced recognition engine is needed for OCR compared to OMR. 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. Its application is in surveys, answer sheets, questionnaires and ballots. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. Learn how your comment data is processed. CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. col path for a30 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. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. It is the rapid method of data entry. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. I am installing two node Oracle 11gR1 RAC on Solaris. Ensure that the most recent OCR contains the latest OCR updates. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. Our storage is EMC SAN. Nytro.ai uses technology that works best in other browsers. 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. The OLR and GPnP profile are required to start the HA service stack. Successful addition of voting disk fa21c52bdf245d89acb2ae7bb245e193. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. (Both primary and mirrors) 2. You must run the command as a user with administrative privileges. (LogOut/ Check the location of OCR Disk from GRID Home with root user. OMR technology scans a printed form and reads from predefined positions. OCR is more commonly used than Voting Disk. c)A node must be able to access more than half of the voting disks at any time. 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. (LogOut/ If one fails it doesnt cause an outage and the failed one can be replaced. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Attempt to resolve the cause of the CLSD-1009 and CLSD-1011 messages. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. OCR contains information about all Oracle resources in the cluster. # /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/). By default, Oracle ASM puts each voting disk in its own failure group within the disk group. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. It records the data where marks are made on the form. 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. Ensure that the Oracle ASM disk group you specify exists and is mounted. List the Candidate Disk present for creating DISKGROUP. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. 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. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". 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. WebHello Friends,Here with one more topic on database administration guide. 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. This process is called DISK HEARTBEAT. Static data: Info about nodes in the cluster. It is hard to implement as compared to OMR. 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. Voting files (Both primary and mirrors) 2. It records the data where marks are made on the form. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface cluster. 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. OCR is what registry is for Windows. Begin to start Oracle Clusterware by running the following command as root on all of the nodes: Verify OCR integrity of all of the cluster nodes that are configured as part of your cluster by running the following CVU command: Use the following procedure to restore OCR on Windows systems: Stop Oracle Clusterware by running the following command as a member of the Administrators group 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 a member of the Administrators group on all of the nodes: Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as a member of the Administrators group: Restore OCR with the OCR backup file that you identified in "Listing Backup Files" by running the following command as a member of the Administrators group: Make sure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Cluster management is now affected on this particular node. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. Voting disks contain static and dynamic data. 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. Majority of the keys in the OCRDUMPFILE deal with the CRSd. Move the VotingDisk to new diskgroup. -- Mount diskgroup 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. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. 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. Disk Group ocr_newdg is running on node01,node02, 8. 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 For DBAs planning to use ScaleIO snapshots, a two-diskgroup solution should be considered the minimum, but control files and redo logs should NOT be mirrored to both diskgroups. 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. There are a few different scenarios possible with missing heartbeats:1. 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. External redundancy: A disk group with external redundancy can store only one voting disk, Normal redundancy: A disk group with normal redundancy stores three voting disks, High redundancy: A disk group with high redundancy stores five voting disks. Ensure that the file you created is visible from all nodes in the cluster. To restore an OCR when clusterware is down. The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 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. 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. In addition, with numerous nodes, there are other possible scenarios too. 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. Attempt to correct the problem using the OCR restoration procedure for your platform. It contains key value pairs of various resources in the cluster. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface OCR has a mechanism that prevents data loss due to accidental overwrites. c)A node must be able to access more than half of the voting disks at any time. [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG Basic information about the resources, their location, permissions, current value, type, state, etc. The destination of OCR file has been replaced. For OCRs not stored on Oracle ASM, Oracle recommends that you mirror OCR on different devices. You cannot inspect the contents of an export. OCR stores Oracle Clusterware and Oracle RAC database configuration information What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? 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. The ocrconfig -export and ocrconfig -import commands are compatible. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. 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. Configure voting files on Oracle ASM or on shared storage. The visually impaired people find it useful. In a nutshell, OCR is used by CRSd and OLR by the OHASd. CRS-4266: Voting file(s) successfully replaced, 9. A voting disk is a file that manages information about node membership. Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. 1. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. Comments. Run the following command on any node in the cluster to remove an OCR location from either Oracle ASM or other location: The file_name variable can be a device name or a file name. Note: After verfied on all nodes then move to OCR Disks. Before you add, delete, replace, or restore voting disks, run the ocrcheck command as root. Failure groups define disks that share components, such that if one fails then other disks sharing the component might also fail. By using our site, you There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface than typical cp and/or dd commands.It is highly recommended to take a backup of the voting disk, and OCR device before making any changes. Successfully replaced voting disk group with +OCR_NEWDG. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This site uses Akismet to reduce spam. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. It does not require an advanced level recognition engine when compared to OCR. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. Change). Just one node is unhealthy. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. 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". 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. 1. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. 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. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. 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. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. --With Spmove command we will move the spfile 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). When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget For a full experience use one of the browsers below. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 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. Use the procedure in this section to add an OCR location. Jump to Answer. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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. Please sign in to comment 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 Oracle Clusterware has the OCR and voting disks open and is actively using them. Voting Disk. where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. Both heartbeats failed. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. 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. Compare the node's OCR configuration (ocr.loc on Linux and UNIX systems and the Registry on Windows systems) with other nodes on which Oracle Clusterware is running.
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