ASM has the options of normal redundancy, high redundancy, and external redundancy. Every time I have worked with ASM for database storage I have used external redundancy, which means using the hardware RAID functionality instead of the ASM functionality. I do sometimes use a high redundancy group for the OCR and voting files, in addition to the hardware RAID, since those groups are relatively small. I guess this is a long winded way of saying most people only use the ASM mirroring if the hardware RAID is unavailable, and I expect that is a best practice, though I do not recall seeing it anywhere. On Mon, Feb 4, 2013 at 2:37 PM, Mike Hayes <funrx1@xxxxxxxxx> wrote: > I haven't done anything with ASM disks. Had a consultant come in to do an > install on a physical server with it's own set of disks. He was all about > that ASM was the way to go and to not use hardware raid and just let ASM do > everything for you was best practice. Now I start reading the Storage > Administrators guide and come across the following in chapter 2: > Logical unit numbers (LUNs)èªsing hardware RAID functionality to create > LUNs is a recommended approach. Storage hardware RAID 0+1 or RAID5, and > other RAID configurations, can be provided to ASM as ASM disks. > > It seems to me we have just gone against best practice. For those who have > experience with ASM do you use hardware raid or not? > > Thanks in advance for your input. > > -- > //www.freelists.org/webpage/oracle-l > > > -- Andrew W. Kerber 'If at first you dont succeed, dont take up skydiving.' -- //www.freelists.org/webpage/oracle-l