Hi all Not being a storage guru, I need some help I have been through the papers on racsig and done some googling "asm mirroring" and looking for product specific papers and cant find anything definitive as to why one is a winner and not the other Here is my scenario 2 HP EVA8000 SANS RAC cluster ASM for storage on said SANS The two SANS are in different datacenteres about 1km apart. Some cluster nodes reside in each datacentre. Oracle 10.2.0.3 Redhat 4 nodes Question is ASM mirroring better than SAN mirroring? Why is it better or not Sould we use the HP SAN mirroring product Cheers -- Peter McLarty Database Administrator Student System Upgrade Project Central Queensland University -- http://www.freelists.org/webpage/oracle-l