difference between ocr and voting disk difference between ocr and voting disk
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. 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. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. 3) CSSD process in each RAC maintains the heartbeat in a block of size 1 OS block in the hot block of the voting disk at a specific offset. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. There are a few different scenarios possible with missing heartbeats:1. Helpful tips . Disk heartbeat is successful, but network heartbeat is missed.3. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. 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. 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. In addition, with numerous nodes, there are other possible scenarios too. It will also provide steps to move OCR / voting and ASM devices from raw device to block device. 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. 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. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. OMR technology scans a printed form and reads from predefined positions. Its application is in surveys, answer sheets, questionnaires and ballots. You cannot inspect the contents of an export. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. 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. 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. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. Few possible scenarios:1. How do you write a referee report for a job application? Oracle Cluster Registry (OCR) which records cluster configuration information. Oracle Cluster Registry (OCR) which records cluster configuration information. Use the procedure in this section to add an OCR location. It shares the same layout or structure as the OCR. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. 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. Please sign in to comment It records the data where marks are made on the form. I am installing two node Oracle 11gR1 RAC on Solaris. 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. (Both primary and mirrors) 2. The written block has a header area with the node name. 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. srvctl status diskgroup -g OCR_NEWDG You can run this command more than once if there is more than one OCR location configured. 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". Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. If you choose to store your voting disks in Oracle ASM, then Oracle ASM stores all the voting disks for the cluster in the disk group you choose. [grid@NODE01 ~]$ asmcmd spmove '+OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136' '+OCR_NEWDG/RAC-cluster/spfileASM.ora', --Verify Perform the following procedure as the root user to remove an OCR location from your Oracle Clusterware environment: Ensure that at least one OCR location other than the OCR location that you are removing is online. 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. If the Oracle Restart home has been backed up, and if there is a failure, then restoring the Oracle Restart home restores OCR. 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 Use the following procedure to import OCR on Linux or UNIX systems: Check whether crsd is running. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Multiple processes on each node have simultaneous read and write access to the OLR particular to the node on which they reside, regardless of whether Oracle Clusterware is running or fully functional. The ocrconfig -export and ocrconfig -import commands are compatible. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. Oracle recommends just two diskgroups by default: By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 3. Your email address will not be published. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. This is called NETWORK HEARTBEAT. The location of OLR can be found in /etc/oracle/olr.loc. Jump to Answer. You can have up to five OCR locations. Ensure that the file you created is visible from all nodes in the cluster. Make sure that xdpyinfo exist under PATH variable. 3. In a nutshell, OCR is used by CRSd and OLR by the OHASd. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. 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. 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. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. The destination of OCR file has been replaced. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. 11gR2 can have upto five mirrored copies of OCR. 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. 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. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. If this problem is local to only one node, you can use other nodes to start your cluster database. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. Mount and check status Diskgroup in all Nodes The -manualbackup option is especially useful when you want to obtain a binary backup on demand, such as before you make changes to OCR. Voting Disk. 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. Mirroring can help prevent OCR from becoming a single point of failure. -- Mount diskgroup It records the data where marks are made on the form. 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. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. It does not require an advanced level recognition engine when compared to OCR. ocrdump should be executed as root to display all the keys available. user13389425 Sep 7 2010 edited Sep 7 2010. 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. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. Is it illegal to lie about a felony on an application? 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. When the clusterware stack is down on all nodes in the cluster, the backups that are listed by the ocrconfig -showbackup command may differ from node to node. At least two OCR locations if OCR is configured on an Oracle ASM disk group. How do you write a referee report for a job application? 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. Our storage is EMC SAN. Added on Sep 7 RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC. Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE 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. (LogOut/ Find the temp usage by sessions in Oracle. The Oracle Clusterware has the OCR and voting disks open and is actively using them. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface 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. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". select path,name,header_status from v$asm_disk 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. A voting disk is a file that manages information about node membership. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. 1. +OCR_NEWDG/RAC-cluster/spfileASM.ora. Recover OCR by running the ocrconfig -restore command, as instructed in the following procedure. Disk Group ocr_newdg is running on node01,node02, 8. For example, if the OCR location is /dev/sde1, then use the command syntax ocrconfig -repair -add /dev/sde1 on this node to repair OCR on that node. 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. Hi all, What is the difference b/w OCR and Voting Disk. 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. 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. It provides more accuracy as compared to OCR. 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. It was first used in 1914 to help blind people in reading. on Oct 5 2010. Typically, one would simply cp or dd the files once the new storage has been presented to the hosts. Oracle Local Registry is OCRs local counterpart. cluster. You can just replace with new voting file on disk group DATA. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. For a full experience use one of the browsers below. Ensure that the Oracle ASM disk group that you specify exists and is mounted. Oracle recommends that you use Oracle ASM to store OCR and voting disks. WebHello Friends,Here with one more topic on database administration guide. CRS-4266: Voting file(s) successfully replaced, 9. It records the data where marks are made on the form. 1. It is useful in grading, calculating marks, etc. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. 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. 10. Static data: Info about nodes in the cluster. Repair an OCR location if Oracle Database displays an OCR failure alert in Oracle Enterprise Manager or in the Oracle Clusterware alert log file, as described in the "Repairing an Oracle Cluster Registry Configuration on a Local Node" section. 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.
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