FAILGROUP fg01 DISK '/dev/oracleasm/disks/OCR_DISK11' Ensure that the most recent OCR contains the latest OCR updates. OCR stores Oracle Clusterware and Oracle RAC database configuration information In addition, with numerous nodes, there are other possible scenarios too. [grid@NODE01 ~]$ crsctl query css votedisk. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 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. It provides more accuracy as compared to OCR. An example of what you might define as a failure group would be a set of SCSI disks sharing the same SCSI controller. This section describes how to back up OCR content and use it for recovery. CRS-4266: Voting file(s) successfully replaced, 9. OCR stores configuration information in a series of key-value pairs in a tree structure. If it cannot access the minimum of voting disks, then it is evicted/removed from the cluster. 3. You can find the location of the OCRFILE using one of the tow methods below. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 1. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". +OCR_NEWDG/RAC-cluster/spfileASM.ora. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. Each voting disk must be accessible by all nodes in the cluster for nodes to be members of the cluster. 2) CSSD process on every node makes entries in the voting disk to ascertain the membership of the node. 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 To migrate OCR to Oracle ASM using OCRCONFIG: Ensure the upgrade to Oracle Clusterware 11g release 2 (11.2) is complete. col header_status for a20 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 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. WebOCR and Voting Disk. 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. srvctl status diskgroup -g OCR_NEWDG This section includes the following topics for managing voting disks in your cluster: Adding, Deleting, or Migrating Voting Disks. Worked as a Development and Database Administrator. Just one node is unhealthy. An advanced recognition engine is needed for OCR compared to OMR. When exporting OCR, Oracle recommends including "ocr", the cluster name, and the timestamp in the name string. You must specify enough failure groups in each disk group to support the redundancy type for that disk group. -- Mount diskgroup 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 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. 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. 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. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. Note: After verfied on all nodes then move to OCR Disks. However, if you upgrade from a previous version of Oracle Clusterware, you can migrate OCR to reside on Oracle ASM, and take advantage of the improvements in managing Oracle Clusterware storage. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'techgoeasy_com-box-4','ezslot_3',192,'0','0'])};__ez_fad_position('div-gpt-ad-techgoeasy_com-box-4-0');1)If it is stored in ASM, no need to configure manually as the files will be created depending on the redundancy in ASM. Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE 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. The ocrconfig -replace command requires that at least two OCR locations are configured. A voting disk is a file that manages information about node membership. The OLR and GPnP profile are required to start the HA service stack. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. Restore Voting Disk Since we have restored OCR, we restored voting file as well. The text to speech can be used by them. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. Break-in heartbeats indicate a possible error scenario. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. These files can be stored either in ASM or in shared storage. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. You cannot directly influence the number of voting disks in one disk group. CSSD is a mutithreaded process.So it use various thread to monitor the heart beat. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. 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. It records the data where marks are made on the form. It contains the following information shared across the 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. Each successive run of this command must point to a different file location. If you are upgrading OCR, then you can use the OCRCHECK utility to verify the integrity of OCR. 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. At least two OCR locations if OCR is configured on an Oracle ASM disk group. OCR is more commonly used than Voting Disk. The location of OLR can be found in /etc/oracle/olr.loc. This process is called DISK HEARTBEAT. It contains manageability information about Oracle Clusterware, including dependencies between various services. In a nutshell, OCR is used by CRSd and OLR by the OHASd. It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. Helpful tips . c)A node must be able to access more than half of the voting disks at any time. Note: In Shared storage you should create 3 minimum voting files in separate storage. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. 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. FAILGROUP fg02 DISK '/dev/oracleasm/disks/OCR_DISK12' The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. You can have up to five OCR locations. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. WebHello Friends,Here with one more topic on database administration guide. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. 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. 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. --Connect with SQLPLUS ASM instance It contains key value pairs of various resources in the cluster. The Oracle Clusterware has the OCR and voting disks open and is actively using them. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. user13389425 Sep 7 2010 edited Sep 7 2010. col name for a20 Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. 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. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. 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. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. 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. 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. Hi, How the voting disk differ from the OCR. 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. However, each successive run must point to a different disk group. Restore Voting Disk Since we have restored OCR, we restored voting file as well. Without the voting disk, its difficult to know, whether nodes are facing network problems or nodes are no longer available. Important points about Voting disks in Oracle RAC. You can use this command whether the voting disks were stored in Oracle ASM or some other storage device. Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands. Is it illegal to lie about a felony on an application? Oracle Cluster Registry (OCR) which records cluster configuration information. Check the SPFILE location. [root@primary01 ~]# crsctl replace votedisk +DATA Successful addition of voting disk a6f4735a13a64f60bf31092700473fad. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface 1. Required fields are marked *. 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. You cannot inspect the contents of an export. These backups are stored for a week and written in a round-robin fashion. Depending on where you store your voting files, do one of the following: If the voting disks are stored in Oracle ASM, then run the following command to migrate the voting disks to the Oracle ASM disk group you specify: The Oracle ASM disk group to which you migrate the voting files must exist in Oracle ASM. I am installing two node Oracle 11gR1 RAC on Solaris. Find the temp usage by sessions in Oracle. Use the following command to verify that Oracle Clusterware is running on the node on which the you are going to perform the replace operation: Run the following command as root to replace the current OCR location using either destination_file or +ASM_disk_group to indicate the current and target OCR locations: The preceding command fails if you have less than two configured OCR locations that are online. 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. Both heartbeats failed. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. 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. For eg, if you have 5 voting disks, a node must be able to access at least 3 of the voting disks. Voting disks contain static and dynamic data. OCR is more commonly used than Voting Disk. You can manually put the mirrored OCRs on a shared network file system (NFS), or on any cluster file system that is certified by Oracle. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. select path,name,header_status from v$asm_disk OCR is what registry is for Windows. Voting files. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Voting files. [root@NODE01 ~]# /u01/app/11.2.0.4/grid/bin/ocrcheck, --Delete the old diskgroup Oracle Cluster Registry (OCR) which records cluster configuration information. Successful deletion of voting disk 8b62c257e7fa2bfabf363cb4791c1f4c. Nodes with quorum will maintain active membership of the cluster and other nodes (s) will be fenced/rebooted. 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. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. To add one or more voting disks, run the following command, replacing the path_to_voting_disk variable with one or more space-delimited, complete paths to the voting disks you want to add: To replace voting disk A with voting disk B, you must add voting disk B, and then delete voting disk A. An FRA diskgroup that holds archivelogs and backups. Use the procedure in this section to add an OCR location. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). 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. You can just replace with new voting file on disk group DATA. It shares the same layout or structure as the OCR. ocrdump should be executed as root to display all the keys available. For a full experience use one of the browsers below. 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. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. 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". Disk heartbeat is successful, but network heartbeat is missed.3. This allows for the FRA diskgroup to be restored at a time slightly ahead of DATA, allowing Oracle to perform additional database recovery through the application of archivelogs.
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