col header_status for a20 In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers. Hi all, What is the difference b/w OCR and Voting Disk. Is it illegal to lie about a felony on an application? 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. c)A node must be able to access more than half of the voting disks at any time. 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. Oracle High Availability Services uses this information. Failure groups are used to determine which Oracle ASM disks to use for storing redundant data. Important points about Voting disks in Oracle RAC. If you choose to store the voting disks on a cluster file system, then select the option to configure multiple voting disks, in which case you will have to specify three different file systems based on different disks. 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. Make sure that xdpyinfo exist under PATH variable. You can just replace with new voting file on disk group DATA. 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. An FRA diskgroup that holds archivelogs and backups. 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++. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. ocrdump should be executed as root to display all the keys available. It records the data where marks are made on the form. Oracle recommends that you use either automatic or manual backups, and the ocrconfig -restore command instead of the ocrconfig -export and ocrconfig -import commands to restore OCR for the following reasons: A backup is a consistent snapshot of OCR, whereas an export is not. to Backup OCR and Voting Disk 4. Mount and check status Diskgroup in all Nodes 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. 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. 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. There are a few different scenarios possible with missing heartbeats:1. Use the following procedure to import OCR on Linux or UNIX systems: Check whether crsd is running. 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. 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. WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. OCR and Voting Disk Do this by using the ocrconfig -export command, which exports OCR content to a file format. Oracle Cluster Registry (OCR) and Oracle Local Registry (OLR) are two very important components of a Grid Infrastructure that help manage the clusterresources. It records the data where marks are made on the form. Backups are created when the system is online. OCR and Voting Required fields are marked *. 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. The written block has a header area with the node name. Your email address will not be published. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. 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, 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. OCR and voting disk To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. 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. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. 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. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrconfig -delete +OCRVD_DG, 11. In a nutshell, OCR is used by CRSd and OLR by the OHASd. These files can be stored either in ASM or in shared storage. 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. Added on Sep 7 to Restore 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. For any work, queries and help. The Windows default location for generating backups uses the same path structure. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. Move the VotingDisk to new diskgroup. When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. Oracle Cluster Registry (OCR) which records cluster configuration information. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. The visually impaired people find it useful. Your biggest Honkai: Star Rail questions, answered Ensure that the Oracle ASM disk group you specify exists and is mounted. OLR is located on local storage on each node in a cluster. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. You should configure OCR in two independent disk groups. 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. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_4',129,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_5',129,'0','1'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_1');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_6',129,'0','2'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_2');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'techgoeasy_com-large-billboard-2','ezslot_7',129,'0','3'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-large-billboard-2-0_3');.large-billboard-2-multi-129{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:2px!important;margin-left:auto!important;margin-right:auto!important;margin-top:2px!important;max-width:100%!important;min-height:250px;min-width:300px;padding:0;text-align:center!important}, Enter your email address to subscribe to this blog and receive notifications of new posts by email. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. Voting Disk. This section describes how to administer OCR in the following topics: Migrating Oracle Cluster Registry to Oracle Automatic Storage Management, Adding, Replacing, Repairing, and Removing Oracle Cluster Registry Locations, Diagnosing Oracle Cluster Registry Problems, Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands, Upgrading and Downgrading the Oracle Cluster Registry Configuration. 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. 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. I am installing two node Oracle 11gR1 RAC on Solaris. 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 text to speech can be used by them. 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 Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. At any one time, Oracle Database always retains the last three backup copies of OCR. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 4) If the disk is not updated in a short timeout period, the node is considered unhealthy and maybe rebooted to protect the database. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. Use ASMCA to create an Oracle ASM disk group that is at least the same size of the existing OCR and has at least normal redundancy. 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 file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. Disk Group ocr_newdg is running on node01,node02, 8. 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. 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. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". Successfully replaced voting disk group with +OCR_NEWDG. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. 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. OCR and Voting Disk Restore Voting Disk Since we have restored OCR, we restored voting file as well. 1. 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. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. The Oracle Clusterware has the OCR and voting disks open and is actively using them. 3. OCR and Voting Disk Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. to Restore OCR and Voting Disk Mirroring can help prevent OCR from becoming a single point of failure. This section describes how to back up OCR content and use it for recovery. Restore Voting Disk Since we have restored OCR, we restored voting file as well. 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. 1. 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. Voting Disk, should it be FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' 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. user13389425 Sep 7 2010 edited Sep 7 2010. To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. Ensure that Oracle ASM disk groups that you create are mounted on all of the nodes in the cluster. 2. 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. 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. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. Then each node uses its local copy of OCR and the local CRSd process to access it and communicate via the same local process if they need more updates from the physical OCR file. If the Oracle Restart home has been backed up, and if there is a failure, then restoring the Oracle Restart home restores OCR. on Oct 5 2010. [grid@RAC1 ~]$ asmcmd spget In this case, a message to this effect is written in the KILL BLOCK of the node. Voting Disk Typically this is the work area and the recovery area. Voting files. When using ScaleIO snapshots, it can be beneficial to snapshot the DATA and FRA diskgroups independently. WebOCR and Voting Disk. 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. Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices. It was introduced in 11gR2, and is not shared by any other node in the cluster. Failure groups define disks that share components, such that if one fails then other disks sharing the component might also fail. 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. (Both primary and mirrors)2. By using our site, you Note: After verfied on all nodes then move to OCR Disks. 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. If it is, stop it by running the following command as a member of the Administrators group: Import OCR by running the following command as a member of the Administrators group: In Oracle Clusterware 11g release 2 (11.2), each node in a cluster has a local registry for node-specific resources, called an Oracle Local Registry (OLR), that is installed and configured when Oracle Clusterware installs OCR. 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.
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