When using a mix of storage pools with both high capacity spinning disks and high performance solid state devices additional diskgroups should be considered, which correspond to the different performance storage pools. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. Check the location of OCR Disk from GRID Home with root user. 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. Ensure there is at least 280 MB of space on the mount partition. to Restore OCR and Voting Disk This site uses Akismet to reduce spam. OCR and Voting Disk The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. 10. Successful deletion of voting disk 0e3a9c8e306a2befaf5548b77231be3a. +OCR_NEWDG/RAC-cluster/spfileASM.ora. Oracle ASM on ScaleIO Best Practices - Dell Technologies b. 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. 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. You can find the location of the OCRFILE using one of the tow methods below. For a full experience use one of the browsers below. It does not require an advanced level recognition engine when compared to OCR. 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). 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. It is hard to implement as compared to OMR. It records the data where marks are made on the form. OCR These files can be stored either in ASM or in shared storage. The ocrconfig -export and ocrconfig -import commands are compatible. 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. 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. Hi, How the voting disk differ from the OCR. 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. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. 1. Voting Disk. 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. 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 WebOracle recommends just two diskgroups by default: A DATA diskgroup to hold all data, index, undo and temp files. 1. Look at output from the ocrdump command and determine whether it has your latest updates. Healthy nodes will have a continuous network and disk heartbeats exchanged between the nodes. Its application is in surveys, answer sheets, questionnaires and ballots. Network heartbeat is successful, but disk heartbeat is missed.2. Use the following command syntax as root on the restarted node where you use either a destination_file or +ASM_disk_group to indicate the current and target OCR locations: This operation only changes OCR on the node on which you run this command. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. If this problem is local to only one node, you can use other nodes to start your cluster database. OCR is more commonly used than Voting Disk. The OLR and GPnP profile are required to start the HA service stack. Check the Voting Disk Location 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. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. 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. Check whether crsd is running. You cannot inspect the contents of an export. (Both primary and mirrors) 2. 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". RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC nodes are available. 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. The location of OLR can be found in /etc/oracle/olr.loc. If a resource fails, then before attempting to restore OCR, restart the resource. Voting Disk, should it be It shares the same layout or structure as the OCR. WebHello Friends,Here with one more topic on database administration guide. 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. Majority of the keys in the OCRDUMPFILE deal with the CRSd. Oracle Clusterware can manage up to five redundant OCR locations. 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. This section describes how to back up OCR content and use it for recovery. To downgrade, follow the downgrade instructions for each component and also downgrade OCR using the ocrconfig -downgrade command. It contains key value pairs of various resources in the cluster. 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. Hi, I am working in IT industry with having more than 10 year of experience, worked as an Oracle DBA with a Company and handling different databases like Oracle, SQL Server , DB2 etc You can manually mirror OCR, as described in the "Adding an Oracle Cluster Registry Location" section, if you: Upgraded to Oracle Clusterware 11g release 2 (11.2) but did not choose to mirror OCR during the upgrade, Created only one OCR location during the Oracle Clusterware installation. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. To restore an OCR when clusterware is down. OCR and Voting Disk (Both primary and mirrors) 2. There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. The procedure described in the following list enables you to start the cluster using the available OCR location. An FRA diskgroup that holds archivelogs and backups. However, each successive run must point to a different disk group. If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. 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. The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. If the configurations do not match, run ocrconfig -repair. "OCRCONFIG Command Reference" for more information about OCRCONFIG commands. Oracle Cluster Registry to Backup OCR and Voting Disk 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. 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. 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. The file format generated by ocrconfig -restore is incompatible with the file format generated by ocrconfig -export. 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. By default, redo logs and control files are mirrored to both the DATA and FRA diskgroups. 1. At any one time, Oracle Database always retains the last three backup copies of OCR. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". WebHello Friends,Here with one more topic on database administration guide. The voting disk is a file that manages information about node membership, and the OCR is a file that manages the cluster and Real Application Clusters (RAC) database configuration information. 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. 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. the OCR, VotingDisk and spfile to new The heartbeat counter increments every second on every write call. Configure voting files on Oracle ASM or on shared storage. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. Under no circumstances will the failure of one Oracle ASM instance on one node affect the whole cluster. 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 Voting files. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). 11gR2 can have upto five mirrored copies of OCR. Each node reads its KILL BLOCK once per second, if the kill block is not overwritten, the node commits suicide. 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. Is it illegal to lie about a felony on an application? There is an API provided for this function (ocrconfig and crsctl), which is the appropriate interface The OCR file is automatically backed up locally in $ORA_CRS_HOME/cdata/
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