Migrate VLDB(30TB) NonRAC database to ASM

My customer is running 10.2.0.5 database which is 30TB in size. Its HACMP/PowerHA with active/passive configuration.
Customer would like to migrate this database to ASM. They dont take rman backups because of the size of the database and rely on bcv backup technology. Customer would like to know what is the best possible way of doing this migration with minimal downtime and risk.

BCV uses copy on write technology and advanced mirroring techniques. A BCVs can be used to resync data or it can be detached from the active data storage and mounted separately for offline processing.
If a complete restore of an object or previous device clone is sufficient then it can be a quick disaster recovery. However, certain implementations, like EMC Timefinder/Snapshot are not suitable for disaster recovery since they rely on the existence of the original data source.
Anyway, I think BCV technology provides only a very limited way for Oracle database backup since it duplicates data errors and is not suitable for advanced rman database or tablespace restore and recovery. A 30 TB database can be time consuming for RMAN, which also depends on what kind of database it is and, for instance, how frequent a full backup is required, but it can be done.
Regarding NAS, it is just an example to show that affordable storage solutions exist and that it does not have to be expensive EMC storage. I do not see why such a solution cannot meet very strict data center controls in terms of technical aspects.

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