INS-30516 Please specify unique disk groups

CAUSE: Installer has detected that the diskgroup name provided already exists on the system.
ACTION: Specify different disk group.

We receive this error INR-30516 Please specify unique disk groups when try to reinstall Grid infrastructure software if it failed.

If the diskgroup Name assigned and physical disk is associated while previous Grid install then it fails to use the same disk.

Solution:

So we need to Clean the Disk header and ASM reload the disks partitions cleaning stale ASM disks.

Step 1 : Clean the disk Header.

#dd if=/dev/zero of=/dev/sdb1 bs=32768 count=32768 conv=notrunc oflag=direct

Note: Specify the of =/dev/sdb1  the disk you havc assigned while previous install.

These disks you can find from

ls -ltr /dev/sd*

Step 2: Reload disk Paritions and Clean the stage ASM disks using Oracleasm tool.

# oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks…
Cleaning disk “DISK1”
Scanning system for ASM disks…