How to rename ASM diskgroups after having cloned the original disks to the same server. ASMlib is used

Linux RHE 6
Oracle Grid single instance (Oracle Restart) 11.2.0.4 installed
Oracle RDBMS 11.2.0.4 installed
One 11.2.0.4 database single instance running
Our ASM have DATA, REDO, FRA diskgroup mounted
We need to do a storage snapshot for creating on THE SAME server a copy of the current ASM diskgroups DATA, REDO, FRA. Then we would rename the cloned diskgroups using renamedg command.
We have done this operation several times when ASMlib is not used. The command used when ASMlib is not used is for example:
renamedg dgname=FRA newdgname=FRA2 verbose=true phase=both asm_diskstring='/dev/oracle/fra*'
With ASMlib in use I am not sure about the steps to follow
First I am not sure about what to provide to the asm_diskstring parameter of the renamedg command. I need to provide an asm_diskstring which identifies the path pointing to the disks belonging to the cloned diskgroup (I do not want to rename the original diskgroup). Though in an ASM instance using ASMlib the parameter asm_diskstring is is ‘ORCL:*’.
Second, I suppose after the diskgroup rename ASMlib would return an error because it would find duplicated disks.
Could you please advise ?
Thanks in advance
Massi

Hi,
As you have OS level clone ,you have same ASMlib label.
ASMlib always mount unique ASMLib label only.
+you need to identify those newly cloned device.
+ Then rename those ASMLib label using force-renamedisk after taking 1Mb disk backup using dd read on one node .
+ Then run scandisks on other nodes .
+ Then validate newly labelled device is mounted or not on all nodes .
$ ls -ltr /dev/oracleasm/disks/*
+ Then run renamedg command with asm_diskstring of /dev/oracleasm/disks/*
Regards,
Aritra

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