It shares the same layout or structure as the OCR. 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". By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Save my name, email, and website in this browser for the next time I comment. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. Look at output from the ocrdump command and determine whether it has your latest updates. Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. Database data files, temp files, redo logs and undo, SYSTEM, SYSAUX, DATA, INDEX, USERS, TEMP, UNDO, Shared or database-specific ASM diskgroups, ScaleIO volumes, ASM diskgroup, and database datafile relationship, ASM stripesize, coarse, and fine grained striping, ASM intelligent data placement and physical disk placement, ASM compaction and rebalance (ASM 11.1.0.7 and later), A DATA diskgroup to hold all data, index, undo and temp files, An FRA diskgroup that holds archivelogs and backups, Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in, Using VMDKs and ASM with Virtualized Databases. --Connect with Grid User Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE Few possible scenarios:1. 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. col name for a20 If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". It does not require an advanced level recognition engine when compared to OCR. 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 High Availability Services uses this information. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. 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. 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 3. 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. 1. 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. 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. Check the Voting Disk Location --Connect with SQLPLUS ASM instance The written block has a header area with the node name. OMR technology scans a printed form and reads from predefined positions. 11gR2 can have upto five mirrored copies of OCR. The Windows default location for generating backups uses the same path structure. You must run the command as a user with administrative privileges. I am installing two node Oracle 11gR1 RAC on Solaris. How do you write a referee report for a job application? For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. It records the data where marks are made on the form. There are a few different scenarios possible with missing heartbeats:1. The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. 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. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. It contains key value pairs of various resources in the cluster. Break-in heartbeats indicate a possible error scenario. It is used in scanning and converting different types of documents. 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. Voting files. Voting disks contain static and dynamic data. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. It stands for Optical Mark Reader or Optical Mark Recognition. 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). Nytro.ai uses technology that works best in other browsers. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Repairing an OCR involves either adding, deleting, or replacing an OCR location. 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. 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 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). 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. You can have up to five OCR locations. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. 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. If you configure a single voting disk, then you should use external mirroring to provide redundancy. It is the rapid method of data entry. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. It is hard to implement as compared to OMR. You can run this command more than once if there is more than one OCR location configured. 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. The heartbeat counter increments every second on every write call. 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. To replace or move the location of an OCR device, 4. 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. Mount and check status Diskgroup in all Nodes [grid@NODE01 ~]$ asmcmd spmove '+OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136' '+OCR_NEWDG/RAC-cluster/spfileASM.ora', --Verify You cannot directly influence the number of voting disks in one disk group. Voting disk management requires a valid and working OCR. 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. Its application is in surveys, answer sheets, questionnaires and ballots. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. 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. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'techgoeasy_com-leader-1','ezslot_11',195,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-leader-1-0');2) In a shared storage system, we need to manually configure these files with a redundancy setup for high availability. 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. c)A node must be able to access more than half of the voting disks at any time. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. The destination of OCR file has been replaced. col header_status for a20 If one fails it doesnt cause an outage and the failed one can be replaced. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. The Oracle Clusterware has the OCR and voting disks open and is actively using them. 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. WebOCR and Voting Disk. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. Helpful tips . Rely on OCR Backups Since 11g (11.2), 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. 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. Oracle Clusterware uses voting files to determine which nodes are members of a To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. 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. You can find the location of the OCRFILE using one of the tow methods below. The location of OLR can be found in /etc/oracle/olr.loc. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Configure voting files on Oracle ASM or on shared storage. For Oracle Clusterware 12c, please refer to Software Patch Level and 12c Grid Infrastructure OCR Backup/Restore. 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 following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. Hi all, What is the difference b/w OCR and Voting Disk. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. 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. However, Oracle recommends using several failure groups. An advanced recognition engine is needed for OCR compared to OMR. In this case, it is a little more difficult because:1. OCR is more commonly used than Voting Disk. 3. To add the file as an OCR location, 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 more than one OCR location. In addition, with numerous nodes, there are other possible scenarios too. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. It contains manageability information about Oracle Clusterware, including dependencies between various services. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. Oracle Cluster Registry (OCR) which records cluster configuration information. 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. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. However, overriding the protection mechanism can result in the loss of data that was not available when the previous known good state was created. 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. 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. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. Backups are created when the system is online. Move the OCR to new diskgroup. At least two OCR locations if OCR is configured on mirrored hardware or third-party mirrored volumes. WebHello Friends,Here with one more topic on database administration guide. The ocrconfig -manualbackup and ocrconfig -restore commands are compatible. To improve Oracle Clusterware storage manageability, OCR is configured, by default, to use Oracle ASM in Oracle Database 11g release 2 (11.2). Oracle Cluster Registry (OCR) which records cluster configuration information. Comments. Because the default backup is on a local file system, Oracle recommends that you include the backup file created with the OCRCONFIG utility as part of your operating system backup using standard operating system or third-party tools. OCR contains information about all Oracle resources in the cluster. Each successive run of this command must point to a different file location. 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 [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Voting files which record node membership information. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. 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. 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. This post has been answered by user00726 on Sep 7 2010. This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. # /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/). 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. Learn how your comment data is processed. Jump to Answer. These backups are stored for a week and written in a round-robin fashion. Failure groups define disks that share components, such that if one fails then other disks sharing the component might also fail. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Learn how your comment data is processed. 1. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. It records the data where marks are made on the form. Oracle Cluster Registry (OCR) which records cluster configuration information. 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. It records the data where marks are made on the form. Oracle Cluster Registry 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. 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. Cluster management is now affected on this particular node. Worked as a Development and Database Administrator. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. +OCR_NEWDG/RAC-cluster/spfileASM.ora. Oracle Clusterware can manage up to five redundant OCR locations. 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. Perform the following procedure to overwrite OCR if a node cannot start and if the alert log contains CLSD-1009 and CLSD-1011 messages. (LogOut/ At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. srvctl status diskgroup -g OCR_NEWDG The destination of OCR file has been replaced. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. 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. At least two OCR locations if OCR is configured on an Oracle ASM disk group. Optical Character Reader (OCR) is used to convert different types of documents such as scanned paper documents, PDF files or images captured by a digital camera into machine-encoded text. List the Candidate Disk present for creating DISKGROUP. By using our site, you such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. 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. 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++. To add an OCRMIRROR device when only OCR device is defined: 3. 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. -- Mount diskgroup Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; "OCRDUMP Utility Syntax and Options" for more information about the OCRDUMP utility, "Using the OCRCHECK Utility" for more information about the OCRCHECK utility. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. This process is called DISK HEARTBEAT. 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. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Restoring the Oracle Cluster Registry on Linux or UNIX Systems, Restoring the Oracle Cluster Registry on Windows Systems, Restoring the Oracle Cluster Registry in an Oracle Restart Environment. 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. 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. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Ensure that the file you created is visible from all nodes in the cluster. CSSD processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heartbeats: Network heartbeat and Disk heartbeat. Oracle ASM manages voting disks differently from other files that it stores. Oracle Local Registry is OCRs local counterpart. +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. If an Oracle ASM instance fails on any node, then OCR becomes unavailable on that particular node. OCR is what registry is for Windows. 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. The procedure described in the following list enables you to start the cluster using the available OCR location. 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. The ocrconfig -replace command requires that at least two OCR locations are configured. on Oct 5 2010. Hi all, What is the difference b/w OCR and Voting Disk. If the original OCR location does not exist, then you must create an empty (0 byte) OCR location before you run the ocrconfig -import command. Voting files SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget 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. This section describes how to back up OCR content and use it for recovery.
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