 File systems can only be enabled with file-level retention (FLR) capability at creation time. When the file system is created and enabled for FLR, it is persistently marked as an FLR file system and the FLR setting cannot be changed. After a file system is created and FLR is enabled, an administrator can apply FLR protection to individual files. Files in the FLR (locked) state can be stored with retention dates, which prohibit the deletion of the file until expiration.  Using File-Level Retention on Celerra provides more information about FLR storage and FLR   file system behavior.  I have attached this for you, as well as documentation for managing filesystems manually.  Sebby Robles eServices EMC Celerra Support      
i want to be prepared for use File Level Retension option enable in a new created file system, that i want to use right now, but FLR is going to be use maybe in about 6 months,  how the space and performance is impacted if i enable FLR, but not use at this moment. any idea.  Thanks you 
for future use need enabling FLR on a file system, how space or performance is 
impacted