Hi, How the voting disk differ from the OCR. 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 can inspect a backup using the OCRDUMP utility. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. [grid@NODE01 ~]$ crsctl replace votedisk +OCR_NEWDG to Backup OCR and 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. Run the following command to verify the current running version: Use the Oracle ASM Configuration Assistant (ASMCA) to configure and start Oracle ASM on all nodes in the cluster. The Oracle Clusterware (Oracle Grid Infrastructure GI stack in 11gR2) uses OCR to manage resources and node membership information. 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. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Oracle on Oct 5 2010. +OCR_NEWDG/RAC-cluster/spfileASM.ora. If the configurations do not match, run ocrconfig -repair. It provides more accuracy as compared to OCR. 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. While marking their own presence, all the nodes also register the information about their communicability with other nodes in the voting disk. You cannot customize the backup frequencies or the number of files that Oracle Database retains. Worked as a Development and Database Administrator. Change), You are commenting using your Facebook account. 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. Since Oracle Database 11gR2 it is recommended to store the OCR and Voting Files in a standalone ASM diskgroup, as shown in Table 3. Modifying voting disks that are stored in Oracle ASM. Will install binaries on local disk and use SAN for Voting disk, OCR and ASM. Check the SPFILE location. Configure voting files on Oracle ASM or on shared storage. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. Oracle recommends that you configure multiple voting disks during Oracle Clusterware installation to improve availability. Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option. 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. 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. OLR is located on local storage on each node in a cluster. If the Oracle Restart home has been backed up, and if there is a failure, then restoring the Oracle Restart home restores OCR. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. The procedure described in the following list enables you to start the cluster using the available OCR location. A high redundancy disk group must contain at least three failure groups. Importing Oracle Cluster Registry Content on Linux or UNIX Systems, Importing Oracle Cluster Registry Content on Windows Systems. Managing Oracle Cluster Registry and Voting Disks SQL> show parameter spfile, [grid@RAC1 ~]$ asmcmd spget This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. to Restore OCR and Voting Disk If necessary, you can dynamically add or replace voting disks after you complete the Oracle Clusterware installation process without stopping the cluster. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. Repairing an OCR involves either adding, deleting, or replacing an OCR location. Oracle Universal Installer for Oracle Clusterware 11g release 2 (11.2), does not support the use of raw or block devices. This section describes how to back up OCR content and use it for recovery. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. However, each successive run must point to a different disk group. OLR is a registry similar to OCR located on each node in a cluster, but contains information specific to each node. [grid@NODE01 ~]$ asmcmd spmove '+OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136' '+OCR_NEWDG/RAC-cluster/spfileASM.ora', --Verify 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. c)A node must be able to access more than half of the voting disks at any time. Change). What are Consumer Forums and what is their importance? Move the VotingDisk to new diskgroup. 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. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. This is true even in cases where there are no working voting disks. For a full experience use one of the browsers below. It is important to ensure that control files, redo log files, temp and undo reside exclusively in a pool with high performance. OCR has a mechanism that prevents data loss due to accidental overwrites. By default, Oracle ASM puts each voting disk in its own failure group within the disk group. If the OCR mirror and OCR have been deleted, then it may be faster to restore the OCR using the OCR backups. (LogOut/ Oracle High Availability Services uses this information. Cloud Applications; Cloud Infrastructure; On-Premise Applications; E-Business Suite; 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. 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. 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. 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. 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. This means that a device must exist. 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. Ocr 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. 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 stores information about the local node only, mainly related to the OHASd (as we will see below). 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. Alternatively, you can place OCR on Oracle ASM and allow it to create mirrors automatically, depending on the redundancy option you select. In such cases, Oracle Database displays an alert message in either Oracle Enterprise Manager, the Oracle Clusterware alert log files, or both. 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. 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. 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. Required fields are marked *. It shares the same layout or structure as the OCR. There are a few different scenarios possible with missing heartbeats:1. 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. 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. It contains the following information shared across the nodes in the cluster. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. The Oracle Clusterware has the OCR and voting disks open and is actively using them. OCR is used in a variety of applications, such as scanning documents and recognizing text in images. OCR is more commonly used than Voting Disk. Like, on my test box, ocrdump shows 676(11.2.0.4)keys in the OCR (could be different on your system). Our storage is EMC SAN. Oracle Cluster Registry This is called NETWORK HEARTBEAT. OCR Use the procedure in this section to add an OCR location. 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. Is it illegal to lie about a felony on an application? If you are storing OCR on an Oracle ASM disk group, and that disk group is corrupt, then you must restore the Oracle ASM disk group using Oracle ASM utilities, and then mount the disk group again before recovering OCR. The Oracle Clusterware has the OCR and voting disks open and is actively using them. Successful deletion of voting disk da722ae356dd2e3ee871601add127e3c. Network heartbeat is successful, but disk heartbeat is missed.2. 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. Oracle Cluster Registry (OCR) which records cluster configuration information. 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. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. If all voting disks are corrupted, however, you can restore them as described in "Restoring Voting Disks". The destination of OCR file has been replaced. The Oracle Clusterware installation process creates the voting disk and the OCR on a shared storage volume. OCR stores configuration information in a series of key-value pairs in a tree structure. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. WebOCR and Voting Disk. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Basic information about the resources, their location, permissions, current value, type, state, etc. Voting Disk. 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. We and our partners share information on your use of this website to help improve your experience. Helpful tips . Use the following procedure to restore OCR in an Oracle Restart environment: Stop Oracle High Availability Services by running the following command on all of the nodes: Run the ocrcheck -config command to determine the OCR location and then create an empty (0 byte) OCR location with appropriate permissions in that location. 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. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. Backups are created when the system is online. OCR stores Oracle Clusterware and Oracle RAC database configuration information 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. OCR and Voting Disk Find the temp usage by sessions in Oracle. Note: After verfied on all nodes then move to OCR Disks. Attempt to correct the problem using the OCR restoration procedure for your platform. OCR is more commonly used than Voting Disk. Once an OCR location is created, it does not get updated in the Oracle Restart environment. 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. Please sign in to comment You cannot directly influence the number of voting disks in one disk group. How do you write a referee report for a job application? Recover the Oracle voting disk when its It also acts as a bootstrap for the Cluster Synchronization Services Daemon (CSSd) for port information, nodes and disks. Successful addition of voting disk B6FF6C1D64B9837D82B1B41D38760445. You can list backups with the ocrconfig -showbackup command, whereas you must keep track of all generated exports. +OCRVD_DG/RAC-cluster/asmparameterfile/registry.183.284573136. 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. 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. The ocrconfig -export and ocrconfig -import commands are compatible. This post has been answered by user00726 on Sep 7 2010. You can run this command more than once if there is more than one OCR location configured. WebHello Friends,Here with one more topic on database administration guide. If OCR is not available or it is corrupt, then you must restore OCR as described in "Restoring Oracle Cluster Registry". In addition, with numerous nodes, there are other possible scenarios too. This post has been answered by user00726 on Sep 7 2010. What is voting disks in RAC For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. OCR Voting files. OCR and voting disk ocrdump should be executed as root to display all the keys available. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. The Oracle installation process for Oracle Clusterware gives you the option of automatically mirroring OCR. You cannot use voting disks stored in Oracle ASM and voting disks not stored in Oracle ASM in the same cluster. In addition, the process prevents overwriting by prohibiting Oracle Clusterware from starting on the node on which only one OCR is available. col name for a20 Oracle Clusterware can manage up to five redundant OCR locations. The new OCR file, device, or disk group must be accessible from all of the active nodes in the cluster. By default, OLR is located at Grid_home/cdata/host_name.olr on each node. Disk Group ocr_newdg is running on node01,node02, 8. 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. The OLR only supports manual backups. difference between OCR and voting disk 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. FAILGROUP fg03 DISK '/dev/oracleasm/disks/OCR_DISK13'; 6. 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. Move the SPFILE to newdiskgroup. The following example shows how to migrate OCR from Oracle ASM to block devices using OCRCONFIG. With the Oracle Clusterware storage residing in an Oracle ASM disk group, you can manage both database and clusterware storage using Oracle Enterprise Manager. Mirroring can help prevent OCR from becoming a single point of failure. The following example shows how to migrate two OCRs to Oracle ASM using OCRCONFIG. Mount and check status Diskgroup in all Nodes Move the OCR to new diskgroup. It maintains and consists of important details about the cluster nodes membership, such as which node is part of the cluster, who (node) is joining the cluster, and who (node) is leaving the cluster. Added on Sep 7 How do you write a referee report for a job application? (Both primary and mirrors) 2. 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. user13389425 Sep 7 2010 edited Sep 7 2010. This step is necessary only if OCR is also corrupted or otherwise unavailable, such as if OCR is on Oracle ASM and the disk group is no longer available. The ocrconfig -replace command requires that at least two OCR locations are configured.