Exadata :: Move Partition From HP Disks To HC Disks

We have Exadata -V2 quarter rack with High Performance Disks. We applied EHCC's various compression methods on some of the table's partitions.

Now we are setting up Exadata Expansion Rack - High Capacity Disks. Post implementation, we would be moving older partitions to new Expansion Rack wherein compressed partitions are also included.

In this case, would there be any impact on the compression ratio as the expansion rack is having high capacity disks.

And, moving partition method would be same as it is for non-exadata database i.e. "alter table <table_name> move partition

<partition_name> tablespace <tablespace_name>"