difference between ocr and voting disk

Typically, one would simply cp or dd the files once the new storage has been presented to the hosts. OCR is more commonly used than Voting Disk. The Oracle Clusterware has the OCR and voting disks open and is actively using them. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. Disk Group ocr_newdg is running on node01,node02, 8. It shares the same layout or structure as the OCR. This post has been answered by user00726 on Sep 7 2010. OLR is located on local storage on each node in a cluster. By using our site, you SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. c)A node must be able to access more than half of the voting disks at any time. The goal of this note is to provide steps to add, remove, replace or move an Oracle Cluster Repository (OCR) and/or Voting Disk in Oracle Clusterware 10gR2, 11gR1 and 11gR2 environment. [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG 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. Managing Oracle Cluster Registry and Voting Disks If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". Hope this sheds some light on what role OCR and OLR play in the Grid Infrastructure. It stands for Optical Character Reader or Optical Character Recognition. OCR stores configuration information in a series of key-value pairs in a tree structure. 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. In addition, with numerous nodes, there are other possible scenarios too. 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 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". Ensure that the file you created is visible from all 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. OCR is more commonly used than Voting Disk. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. [grid@RAC1 ~]$ asmcmd spget WebOCR and Voting Disk. The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. CRS-4266: Voting file(s) successfully replaced, 9. difference between OCR and voting disk There are a few different scenarios possible with missing heartbeats:1. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents: Run the following command to recover a voting disk where backup_file_name is the name of the voting disk backup file and voting_disk_name is the name of the active voting disk: Hope you like the information onvoting disks in RAC. Its application is in google books, bank statements, business documents etc. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. Change). If you cannot resolve the problem that caused the CLSD message, then run the command ocrconfig -overwrite to start the node. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -add +OCR_NEWDG, --Verify the OCR is show in two diskgroup By default, OLR is located at Grid_home/cdata/host_name.olr on each node. It contains key value pairs of various resources in the cluster. difference between OCR and voting disk 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. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. For a full experience use one of the browsers below. Required fields are marked *. Majority of the keys in the OCRDUMPFILE deal with the CRSd. 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. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. This is true even in cases where there are no working voting disks. OCR and Voting Disk Oracle ASM manages voting disks differently from other files that it stores. An FRA diskgroup that holds archivelogs and backups. Move the VotingDisk to new diskgroup. 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. 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. The OLR and GPnP profile are required to start the HA service stack. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. 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. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. Please sign in to comment Mount and check status Diskgroup in all Nodes 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. Oracle recommends that you use Oracle ASM to store OCR and voting disks. Ocr col name for a20 The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. 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. What is voting disks in RAC --With Spmove command we will move the spfile srvctl status diskgroup -g OCR_NEWDG Check the Voting Disk Location You must run the command as a user with administrative privileges. OCR contains information about all Oracle resources in the cluster. to Restore OCR and Voting Disk The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. This process is called DISK HEARTBEAT. 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. 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. OCR and voting disk It is the rapid method of data entry. Do this by using the ocrconfig -export command, which exports OCR content to a file format. 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. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. Voting disk management requires a valid and working OCR. Comments. ocrdump should be executed as root to display all the keys available. Move the OCR to new diskgroup. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. OCR Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. Save my name, email, and website in this browser for the next time I comment. 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. At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. OCR has a mechanism that prevents data loss due to accidental overwrites. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. b. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' OMR technology scans a printed form and reads from predefined positions. 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. In addition to using the automatically created OCR backup files, you should also export OCR contents before and after making significant configuration changes, such as adding or deleting nodes from your environment, modifying Oracle Clusterware resources, and upgrading, downgrading or creating a database. 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. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Managing Oracle Cluster Registry and Voting Disks The Oracle Clusterware installation process creates the voting disk and the OCR on shared storage. The Oracle Clusterware has the OCR and voting disks open and is actively using them. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. 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 OCR and Voting Disk An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. Basic information about the resources, their location, permissions, current value, type, state, etc. It records the data where marks are made on the form. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. Remove an OCR location if, for example, your system experiences a performance degradation due to OCR processing or if you transfer your OCR to RAID storage devices and choose to no longer use multiple OCR locations, as described in the "Removing an Oracle Cluster Registry Location" section. 2. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. By default, Oracle ASM puts each voting disk in its own failure group within the 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. 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. You cannot directly influence the number of voting disks in one disk group. Ensure that the Oracle ASM disk group that you specify exists and is mounted. Configure voting files on Oracle ASM or on shared storage. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. This means that a device must exist. Voting files which record node membership information. The text to speech can be used by them. The written block has a header area with the node name. OCR stores configuration information in a series of key-value pairs in a tree structure. How do you write a referee report for a job application? OCR and Voting Disk OCR stores Oracle Clusterware and Oracle RAC database configuration information OCR col header_status for a20 If all of the voting disks are corrupted, then you can restore them, as follows: Restore OCR as described in "Restoring Oracle Cluster Registry", if necessary. 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. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. You can just replace with new voting file on disk group DATA. 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. 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. Recover the Oracle voting disk when its Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. 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. In a nutshell, OCR is used by CRSd and OLR by the OHASd. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. 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 Cluster Registry (OCR) which records cluster configuration information. 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. Check the location of OCR Disk from GRID Home with root user. Network heartbeat is successful, but disk heartbeat is missed.2. Helpful tips . You cannot inspect the contents of an export. Oracle ASM on ScaleIO Best Practices - Dell Technologies Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. Voting Disk Healthy nodes will have continuous network & disk heartbeats exchanged between the nodes. For Oracle Clusterware 12c, please refer to Software Patch Level and 12c Grid Infrastructure OCR Backup/Restore. Our storage is EMC SAN. 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. This post has been answered by user00726 on Sep 7 2010. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. The OLR only supports manual backups. 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 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. to Backup OCR and Voting Disk OCR If you choose to put the voting disks into an Oracle ASM disk group, then Oracle ASM ensures the configuration of multiple voting disks if you use a normal or high redundancy disk group. 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. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. OMR technology scans a printed form and reads from predefined positions. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 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. cluster. The two file formats are incompatible and must not be interchangeably used. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/crsctl query css votedisk, 3. OCR and Voting 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. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 3. Modifying voting disks that are stored in Oracle ASM. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. 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 resolve the cause of the CLSD-1009 and CLSD-1011 messages. In a nutshell, OCR is used by CRSd and OLR by the OHASd. 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. 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. It was first used in 1914 to help blind people in reading. 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.

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