In this blog I discuss an error in installation of 18c RAC (or any), when you try to re-install 18c RAC due to any reason or probably deinstall a previous version and install a new one (not upgrade) then the below error is possible.
[FATAL] [INS-30516] Please specify unique disk groups.
CAUSE: Installer has detected that the diskgroup name provided already exists on the system.
This error is due to disk headers still have the entry of last Disk group which was using it.
What you need to do ?
1. List out all the disks which are part of your installation
2. Wipe out all the disks as below
dd if=/dev/zero of=<disk complete path> bs=1024k count=50
Note - the path has to be of physical disk and not the path which oracleasm gives (in case you are using oracleasm)
In multipath you can have the multipathed device
3. Re-run the installation
[FATAL] [INS-30516] Please specify unique disk groups.
CAUSE: Installer has detected that the diskgroup name provided already exists on the system.
This error is due to disk headers still have the entry of last Disk group which was using it.
What you need to do ?
1. List out all the disks which are part of your installation
2. Wipe out all the disks as below
dd if=/dev/zero of=<disk complete path> bs=1024k count=50
Note - the path has to be of physical disk and not the path which oracleasm gives (in case you are using oracleasm)
In multipath you can have the multipathed device
3. Re-run the installation
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