I wouldn't rely on the storage mirroring for the voting disk. I would have it redundant within Oracle also - as you would for controlfiles, online redo logs, etc. I have seen it happen before where a flaw in the mirroring technology resulted in the loss of a file. The system had been created with single online redo logs because the disk was mirrored, but the mirroring failed and the database failed with it. -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Radoulov, Dimitre Sent: Wednesday, September 19, 2012 5:07 AM To: Zabair Ahmed Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: Voting Disks and OCR on 11.2.0.2 On 19/09/2012 12:58, Zabair Ahmed wrote: > So, back to my original question. Do I have a single point of failure? > I have single raw/block device LUN which is configured within ASM as > an ASM diskgroup (ASMSYS) with EXTERNAL REDUNDANCY to hold a single > Voting Disk. At the SAN level I am told by the sysadmin that it's > either RAID 1 or RAID 5. > So it appears that your single voting disk is on a mirrored LUN (RAID 1 or 5), I don't consider this a single point of failure. Regards Dimitre -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l