Vivek, You can not do the DD to the ASM. You have to take an RMAN backup and restore the ASM and RMAN-switch to have the data files names. I have just migrated a 4TB 9i DB to 4 Node 10gRAC with ASM over the weekend. Just have enough channels allocated for RMAN and keep only one instance (RAC+ASM) during the migration. You will be good to go. With proper planning, I guess you may be able to complete this over a weekend (including minimal testing!).. Good Luck ! -- Best Regards, K Gopalakrishnan Co-Author: Oracle Wait Interface, Oracle Press 2004 http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/ Author: Oracle Database 10g RAC Handbook, Oracle Press 2006 http://www.amazon.com/gp/product/007146509X/