Do new data arriving into a cold storage folder on hdfs need to be moved by a mover?

[#1]

Hello,

We are using hdfs 2.7.3, and we have set the storage policy of one folder to cold (Archive). We have restarted dediated services on the datanodes (the namenode services weren't asked to be restarted).

I know that we have to launch a mover process to move the existing blocks which violate the storage policy. However, it looks like the new data is not automatically write into the cold storage and still need the mover. 

How does it work? Did I miss anything? Is there a way to make the block placement automatic to the cold storage location?

*What I'm sure: the storage policy is applied (checked from getStoragePolicy and fsck command)

Thank you.