Performing Oracle 11g Automatic Storage Management - ASM Data Migration
Purpose of ASM Data Migration
Alternatives to ASM storage include file systems, raw disks, and SAN configurations. ASM includes a number of benefits over these storage alternatives, including performance optimization, redundancy protection, and load balancing. You do not need to obtain a third-party Logical Volume Manager because ASM manages disks for you. Oracle Real Application Clusters (Oracle RAC) databases benefit from ASM because it provides ready-made shared storage.
If a database currently uses a storage system other than ASM, then you can migrate all or part of the database into ASM, thereby simplifying database administration. You can also migrate a flash recovery area to ASM.
Native operating system commands such as Linux cp or Windows COPY cannot write or read files in ASM storage. Because RMAN can read and write ASM files, you can use RMAN to copy datafiles into and out of ASM storage or between ASM disk groups. This technique is useful if you need to store backups on user-managed disks.