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This article introduces the relevant knowledge of "what are the problems that need to be paid attention to in 12c-RAC installation". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Hardware requirements: the system memory is at least 8g memory, the space of swape is at least 8g, the OCR disk group is at least 39g. Additional operation su-oracleulimit-s 10240-effective for the current session, but not for other sessions at the same time, except for the new session, ulimit-a check (- s option value) su-gridulimit-s 10240ulimit-a check (- s option value) there is no need to set ORACEL_HOME in the environment variable of grid before installation. After the installation is successful, add the ORACLE_HOME variable again. Node 1: extract the grid package into ORACLE_HOME, node 2: there is no need to extract the zip file of grid to ensure that there are no files or folders under ORACLE_HOME. Unlike the 11gRAC installation, you can choose the ORACLE_HOME of the grid user in 11gRAC, while the 12cRAC installation forces the ORACLE_HOME to be specified as the software extraction location and cannot be modified. Virtual machine vmware, in addition to adding disk sharing configuration (disk.locking= "FALSE"), you also need to add disk.EnableUUID= "TRUE". If you do not add it, it will cause the rac environment to check for errors before installation (Verification WARNING result on node: 12c-rac01 Details:-PRVG-0805: Signature for storage path "/ dev/oracleasm/disks/OCR" could not be determined on node "12c-rac01". -Cause: An error occurred while attempting to determine the storage signature of the indicated path. Accompanying messages provide further details. -Action: Resolve the issues described in any accompanying messages and retry. -PRVG-2078: Execution of command "/ usr/sbin/cvuqdisk-sign2" on node "12c-rac01" for disk "/ dev/sdb1" showed there was no UUID in the disk label. -Cause: An attempt to retrieve the universally unique ID (UUID) for the indicated disk on the node shown using the indicated command in order to check for sharedness across nodes determined that the disk did not have a UUID. Sharedness could not be checked for this device. -Action: To check sharedness for the indicated device, assigned it a UUID using the commands specific to the platform and retry the sharedness check. Alternatively, select a different device with a UUID for shared access and verify sharedness for that disk. -PRVG-2078: Execution of command "/ usr/sbin/cvuqdisk-sign" on node "12c-rac01" for disk "/ dev/sdb1" showed there was no UUID in the disk label. -Cause: An attempt to retrieve the universally unique ID (UUID) for the indicated disk on the node shown using the indicated command in order to check for sharedness across nodes determined that the disk did not have a UUID. Sharedness could not be checked for this device. -Action: To check sharedness for the indicated device, assigned it a UUID using the commands specific to the platform and retry the sharedness check. Alternatively, select a different device with a UUID for shared access and verify sharedness for that disk. -PRVG-2078: Execution of command "/ sbin/udevadm info-n / dev/sdb1-Q all" on node "12c-rac01" for disk "/ dev/sdb1" showed there was no UUID in the disk label. -Cause: An attempt to retrieve the universally unique ID (UUID) for the indicated disk on the node shown using the indicated command in order to check for sharedness across nodes determined that the disk did not have a UUID. Sharedness could not be checked for this device. -Action: To check sharedness for the indicated device, assigned it a UUID using the commands specific to the platform and retry the sharedness check. Alternatively, select a different device with a UUID for shared access and verify sharedness for that disk. -PRVG-0805: Signature for storage path "/ dev/oracleasm/disks/OCR" could not be determined on node "12c-rac01" -Cause: An error occurred while attempting to determine the storage signature of the indicated path. Accompanying messages provide further details. -Action: Resolve the issues described in any accompanying messages and retry. -) the error report roughly means that when checking the disk, you cannot get the uuid of the added disk by running the following command, resulting in an error.

When adding an OCR disk group during a GI installation, the disk is not recognized by the graphical interface

Check change discovery path

Change the path in it to / dev/oracleasm/disks/*

Just rediscover it.

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