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I think your research about OCR and VDisks are in rigth way...
Use the ocopy utility on Windows to copy and repoint the location with crsctl add and remove commands to solve your issue.
ocopy \\.\votedsk1 \\.\votedsk3
Where \\.\vote1 is a raw and \\.\votedsk3 is another raw device on Windows (manage it with diskpart utility)
crsctl delete css votedisk \\.\votedsk1_old -force
crsctl add css votedisk \\.\votedsk1_new -force
crsctl delete css votedisk \\.\votedsk3_old -force
crsctl add css votedisk \\.\votedsk3_new -force
Note: For 10g the cluster must be down
ocrconfig -replace ocr \\.\new_ocr_location1 (raw device)
ocrconfig -replace ocrmirror \\.\new_ocr_location2 (raw device)
Note: The commands above can be done online with cluster online.
I think you should take a look no Metalink note ID 428681.1 and ID 555273.1
How see discovery <PATH> for votingdisk or OCR
If you can see disk in disk management, and it is been initialized and set as logical partion then you use following
set oracle_home to crs home
cd into oracle_home/bin
This will open GUI which will show you the names of voting disk and OCR.
If you want to add new one then type name in "New Link" (dont rename the existing used partition)
Then go to options and commit and then Sync Nodes.
letus say you added name VOTEDSK15 then your <PATH> will be \\.\VOTEDSK15
Could you list out the steps you did after you create the link on the new SAN using GUIObjectManager.exe?
I tried on my VM and also in customer's test environment but I only successful using the following steps
1. shutdown asm service, database service, listener service, CRS, EVM and CSS
2. Object Manager Service is kept running
3. from both nodes I issued the following command
ocrconfig -repair \\.\OCRPRIMARY
ocrconfig -repair \\.\OCRMIRROR
4. according to metalink id 428681.1, I should do the following
However I was not successful because that command returns an error message (PROT-1: Failed to initialize ocr config).
Therefore, I ran the following command
ocrconfig -restore D:\oracle\1020\CRS\cdata\crs\backup00.ocr
5. after that command, ocrcheck giving me the result and the ocr primary and mirror have been moved to the new partition.
6. start the whole services starting from CSS, EVM, CRS, ASM, Listerner and Database service.
Although what I experienced seems a bit weird and not the same as what was written in metalink, the RAC is running fine until now.
What I would like to know is your experience on this. May be you can share it here.